BPSC Prelims 2025 Question Paper with Answers & Explanations

Explanation

Microscope, Telescope, and Periscope are all optical instruments that aid in vision by magnifying or allowing sight around obstructions. A Microscope helps see tiny objects, a Telescope helps see distant objects, and a Periscope allows viewing from a hidden position, typically using lenses and mirrors. A Stethoscope, however, is an acoustic medical instrument used for listening to internal body sounds, such as heartbeats or breathing, and does not involve optical viewing. Therefore, Stethoscope is the different word among the given options.

Explanation

The coding pattern for SPRING to UNUFRC follows an alternating sequence of addition and subtraction to the letter positions in the alphabet. For the first letter, S (+2 positions) becomes U. For the second, P (-2 positions) becomes N. This pattern continues: R (+3) becomes U, I (-3) becomes F, N (+4) becomes R, and G (-4) becomes C. Applying this same pattern of (+2, -2, +3, -3, +4, -4) to the word MOBILE, we get M(+2)=O, O(-2)=M, B(+3)=E, I(-3)=F, L(+4)=P, and E(-4)=A. Thus, MOBILE is coded as OMEFPA.

Explanation

Let's break down the relationship described by Mukesh. "My son's wife" refers to Mukesh's daughter-in-law. "My son's wife's daughter" therefore means the daughter of Mukesh's daughter-in-law, which makes her Mukesh's granddaughter. The statement "Rita is the mother of my son's wife's daughter" implies that Rita is the mother of Mukesh's granddaughter. Since Mukesh's son's wife is the mother of his granddaughter, Rita must be Mukesh's son's wife, making her Mukesh's daughter-in-law. Consequently, Mukesh is Rita's father-in-law.

Explanation

Ram begins by moving in the North direction. From this Northward path, his first right turn leads him to face towards the East. Subsequently, taking another right turn from the East direction changes his orientation to face South. His final movement involves turning left from the South direction. When one is facing South, a left turn points towards the East. Therefore, Ram's final direction is East.

Explanation

To determine which name appears last in alphabetical order, we compare them letter by letter. All names start with 'M'. Comparing the second letter, 'a' in Mahinder (A) and Mahendra (D) comes before 'o' in Mohinder (B) and Mohender (C). Between Mahinder and Mahendra, 'e' in Mahendra comes before 'i' in Mahinder. Between Mohinder and Mohender, 'e' in Mohender comes before 'i' in Mohinder. Thus, the full alphabetical order is Mahendra, Mahinder, Mohender, Mohinder. Therefore, Mohinder will appear last.

Explanation

First, determine Joginder's rank from the beginning of the class. If Joginder is 17th from the last in a class of 39 students, his rank from the beginning is calculated as Total students - Rank from last + 1, which is 39 - 17 + 1 = 23rd. Nitin is 7 ranks ahead of Joginder. Therefore, Nitin's rank from the beginning is Joginder's rank from the beginning minus 7, which is 23 - 7 = 16th.

Explanation

Substitute the given symbol meanings into the expression. '+' means '×', '×' means '-', '÷' means '+', and '-' means '÷'. The original expression 175 – 25 ÷ 5 + 20 × 3 + 10 transforms into 175 ÷ 25 + 5 × 20 - 3 × 10. Following the order of operations (BODMAS/PEMDAS), first perform divisions and multiplications: 175 ÷ 25 = 7, 5 × 20 = 100, and 3 × 10 = 30. The expression simplifies to 7 + 100 - 30. Finally, perform addition and subtraction: 7 + 100 = 107, and 107 - 30 = 77.

Explanation

First, calculate Rahul's present age. If Rahul will be 31 in four years, his current age is 31 - 4 = 27 years. Since Rahul is 3 times as old as Seema, Seema's present age is 27 / 3 = 9 years. Next, find Laxmi's present age. Four years ago, Rahul's age was 27 - 4 = 23 years. Laxmi was twice as old as Rahul four years ago, so Laxmi's age four years ago was 2 * 23 = 46 years. Therefore, Laxmi's present age is 46 + 4 = 50 years.

Explanation

The pattern observed across the rows is consistent: the middle number in each row is obtained by dividing the first number by the third number, and then multiplying the result by 5. For the first row, (28 / 7) 5 = 4 5 = 20. For the third row, (45 / 9) 5 = 5 5 = 25. Applying this same pattern to the second row, we calculate (84 / 12) 5. This equals 7 5, which results in 35.

Explanation

By comparing the given codes, we can deduce the individual letter codes. From RAIN = 8%6, we get R=8, A=, I=%, and N=6. From MORE = 7#8@, we get M=7, O=#, R=8, and E=@. The code for R is consistently '8'. To form the code for REMAIN, we combine these individual letter codes in order: R (8), E (@), M (7), A (), I (%), N (6). Thus, REMAIN is coded as 8@7%6.

Explanation

In the 37th National Junior Athletics Championship (2022), Bihar players won 5 bronze medals.

Explanation

The Kosi Mechi Link Project is a crucial river interlinking initiative in Bihar aimed at providing extensive irrigation benefits to agricultural lands. This project primarily targets the districts in the northeastern part of the state, which have historically faced challenges in irrigation. The districts specifically identified to receive significant benefits from the Kosi Mechi Link Project are Araria, Purnea, Kishanganj, and Katihar, improving agricultural productivity in these regions.

Explanation

As of 2025, the Government of India has accorded Classical Language status to Tamil, Sanskrit, Kannada, Telugu, Malayalam, Odia, Marathi, Bengali, Pali, Prakrit, and Assamese. In October 2024, five new languages — Marathi, Bengali, Pali, Prakrit, and Assamese — were added. Among the options, Telugu (A), Marathi (B), and Bengali (C) all hold Classical Language status, making D ('More than one of the above') the correct answer.

Explanation

The Nagi bird sanctuary Site, situated in Bihar, has been officially recognized as an Important Bird and Biodiversity Area (IBA). This designation is made by BirdLife International, a global partnership of conservation organizations focused on the protection of birds, their habitats, and biodiversity worldwide. IBAs are internationally recognized sites critical for the conservation of global bird populations and overall biodiversity.

Explanation

National Panchayati Raj Day is observed every year on April 24, commemorating the date the 73rd Constitutional Amendment came into force in 1993. For 2025, the national-level event was organised in Madhubani, Bihar. Prime Minister Narendra Modi attended the ceremony held in Madhubani, where awards were presented to best-performing gram panchayats across the country. Madhubani is also known for its traditional Mithila painting tradition, giving the venue added cultural significance for the occasion.

Explanation

The Lunar Trailblazer mission is a small, high-science-yield mission developed by NASA. Its primary scientific objective is to determine the form, abundance, and distribution of water on the Moon. The mission uses two instruments to detect and map water ice in permanently shadowed regions and observe how lunar water changes over the course of a lunar day.

Explanation

Afrikaners are an ethnic group in Southern Africa, primarily residing in South Africa, who are descended from Dutch, German, and French Huguenot settlers. They are a white minority group in South Africa and speak Afrikaans, a Germanic language derived from Dutch, which developed in the country.

Explanation

The Archaeological Survey of India (ASI) recently undertook a significant conservation project on Rajon ki Baoli in collaboration with the World Monuments Fund India. This 16th-century stepwell, located in the Mehrauli Archaeological Park in Delhi, is known for its architectural grandeur and historical importance, and the conservation efforts aimed to preserve its heritage.

Explanation

New York City Mayor Eric Adams officially proclaimed April 14, 2025, as Dr. B. R. Ambedkar Day. This declaration recognizes the profound contributions of Dr. B. R. Ambedkar, a revered leader, social reformer, and principal architect of the Indian Constitution, to human rights, equality, and social justice.

Explanation

"United By Music" was officially established as the permanent slogan for the Eurovision Song Contest by the European Broadcasting Union (EBU) in 2023. This slogan emphasizes the core message of the contest, which is to bring people and cultures together through the power of music, regardless of annual host city variations.

Explanation

The GSLV-F15 mission is designated by ISRO to launch the NVS-02 satellite. NVS-02 is the second satellite in the second-generation NavIC (Navigation with Indian Constellation) series, designed to provide advanced positioning, navigation, and timing services over India and its surrounding regions. This mission is part of ISRO's ongoing efforts to enhance India's independent satellite navigation capabilities.

Explanation

The 18th G20 Summit took place in New Delhi, India, on September 9-10, 2023, under the theme "Vasudhaiva Kutumbakam" (One Earth, One Family, One Future). Rio de Janeiro, Brazil, was the host city for the 19th G20 Summit in 2024, and its proposed theme was "Building a Just World and a Sustainable Planet." Discussions on the taxation of billionaires were initiated by Brazil during its 2024 presidency, not during the 18th summit. Therefore, none of the given statements are true for the 18th G20 Summit.

Explanation

The UN climate conference COP29, held in Baku, Azerbaijan, in 2024, reached a significant agreement on a new global climate finance goal. The outcome specifically calls on developed countries to collectively provide at least 300 billion annually to developing nations by 2035. This funding is crucial for developing countries to implement climate change mitigation and adaptation strategies, addressing the disproportionate impacts they face.

Explanation

Han Kang, the acclaimed South Korean author who received the Nobel Prize in Literature in 2024, gained significant international recognition for her novel ‘The Vegetarian’. This novel won the prestigious International Booker Prize in 2016, an award given to the best single work of fiction translated into English and published in the UK or Ireland. This achievement played a crucial role in introducing her work to a global audience.

Explanation

The Yala Glacier, situated in Nepal’s Langtang region, is one of the most intensively studied glaciers in the Himalayas. Scientific research has consistently highlighted its rapid melting, retreat, and significant mass loss over recent decades due to climate change. Although a precise official declaration of "dead" may vary, the Yala Glacier is widely considered to be functionally "dead" or in a terminal state, having largely lost its ability to accumulate new ice and sustain its mass.

Explanation

According to the UNDP Human Development Report 2025, India's life expectancy increased from 58.6 years in 1990 to 72 years in 2023. This represents a significant improvement of over 13 years across three decades, reflecting gains in healthcare access, nutrition, and public health infrastructure. India's HDI rank also improved during this period, though the country remains in the medium human development category globally.

Explanation

The AI Action Summit, an international conference focused on driving global cooperation and concrete actions in artificial intelligence, is scheduled to be held in Paris in February 2025. This summit is organized by the Organisation for Economic Co-operation and Development (OECD) to bring together stakeholders from governments, industry, academia, and civil society to discuss key AI issues and foster responsible innovation. Paris is a significant hub for international policy discussions, making it a fitting venue for such a global initiative.

Explanation

Emma Stone won the Academy Award for Best Actress in a Leading Role at the 96th Academy Awards ceremony in 2024 for her critically acclaimed performance in the film Poor Things. In the film, she portrays Bella Baxter, a young woman brought back to life by an eccentric scientist, delivering a unique and compelling performance that garnered widespread praise. This marked her second Oscar win in this category.

Explanation

At the 70th National Film Awards, which recognized films released in 2022 and were announced in 2024, the Gujarati film Kutch Express won the award for Best Feature Film promoting national, social and environmental values. The film depicts themes tied to the Kutch region of Gujarat. Hellaro had won the same award at the 66th National Film Awards, while Chhello Show (Last Film Show) was India's official entry to the Oscars that year but won in a different category.

Explanation

The Ramon Magsaysay Award 2024 recognized multiple individuals and an organization for their outstanding contributions. Among the recipients announced in August 2024 were Phuntsho Karma from Bhutan, honored for Holistic Education; the Rural Doctors Movement from Indonesia, recognized for Community Health; and Miyazaki Hayao from Japan, awarded for Animation and Artistic Vision. As all three listed options are indeed recipients of the 2024 award, "More than one of the above" is the correct choice.

Explanation

Akashteer is indeed the Indian Army's new automated Air Defence Control and Reporting System, making it the core of their Air Defence (AAD) system. It is designed to seamlessly integrate various air defence sensors and weapon systems, thereby enhancing India’s larger C4ISR capabilities (Command, Control, Communications, Computers, Intelligence, Surveillance, and Reconnaissance). This integration facilitates a shift from a purely passive air defence approach to a more proactive and unified response against aerial threats. Since statements A, B, and C are all accurate descriptions of Akashteer's features and strategic importance, "More than one of the above" is the correct answer.

Explanation

The F-35 Lightning II is an American stealth fighter jet and is not part of India's indigenous defence ecosystem. The Main Battle Tank (MBT) Arjun is an indigenously developed third-generation tank by India's Defence Research and Development Organisation (DRDO). Similarly, the Advanced Towed Artillery Gun System (ATAGS) is a 155mm, 52-calibre howitzer developed by DRDO as part of the "Make in India" initiative. Therefore, both MBT Arjun and ATAGS are indigenous defence platforms, making "More than one of the above" the correct answer.

Explanation

Holocaust Memorial Day is observed annually on January 27th. This date was chosen by the United Nations General Assembly to commemorate the liberation of the Auschwitz-Birkenau concentration and extermination camp by Soviet troops in 1945. It serves as a day to remember the victims of the Holocaust and other genocides, and to promote education about these atrocities.

Explanation

According to the premise that the 2025 International Booker Prize has been awarded, the book by Banu Mushtaq that won the prestigious award is titled "Heart Lamp". This prize recognizes the best single work of fiction translated into English and published in the UK or Ireland.

Explanation

The Indus Waters Treaty, signed between India and Pakistan in 1960, allocates the three eastern rivers for India's exclusive use. These eastern rivers are the Ravi, Beas, and Sutlej. The Jhelum River, along with the Indus and Chenab, are classified as western rivers, primarily allocated to Pakistan, with India having limited non-consumptive use rights. Therefore, Jhelum is not one of the eastern rivers allocated to India.

Explanation

The Capability Poverty Measure (CPM), developed by the UNDP in its 1996 Human Development Report, focuses on three basic deprivations. These are measured by: the proportion of children under five who are underweight (child malnutrition), which reflects a lack of health and nourishment; the proportion of women aged 15 and above who are illiterate, reflecting deprivation in education and knowledge; and the proportion of births unattended by trained health personnel, reflecting lack of access to health services. Therefore, statements 1 and 2 are correct, while statement 3 (male illiteracy) and statement 4 (lack of access to clean drinking water) are incorrect components of the original CPM.

Explanation

India's principal export commodities generally include a range of petroleum products, engineering goods, gems and jewellery, drugs and pharmaceuticals, and iron and steel. While Basmati Rice is an important agricultural export product, it typically does not feature in the top ten principal commodities by overall value in India's total export basket, unlike industrial and refined products. Petroleum products and iron and steel consistently rank among India's major exports.

Explanation

According to the India State of Forest Report (ISFR) 2021, which is the latest report available as of early 2024 and from which trends are expected to continue, the total forest and tree cover of the country is approximately 24.62% of the geographical area, not 15%. The top states with the largest forest cover include Madhya Pradesh, Arunachal Pradesh, and Chhattisgarh. However, the maximum tree cover has indeed been found in the State of Maharashtra, followed by Rajasthan and Uttar Pradesh.

Explanation

In global services trade for 2023, countries like the USA, UK, Germany, China, and Ireland typically hold a larger share than India. India is a significant services exporter, especially in IT services, but its overall share is still surpassed by several advanced economies. Ireland, in particular, consistently ranks among the top global services exporters, often ahead of India, due to its role as a hub for multinational corporations in sectors like technology and financial services.

Explanation

The U-WIN portal provides QR-based certificates, ABHA integration, and is available in 12 languages. Since all statements are correct, D is the correct answer.

Explanation

The National Urban Innovation Stack (NUIS) Digital Blueprint was developed as a collaborative effort between the Ministry of Housing and Urban Affairs (MoHUA) and the National Institute of Urban Affairs (NIUA). NIUA is a leading national resource centre for urban development and research, making it a key partner in conceptualizing and designing digital solutions for urban governance and service delivery. This blueprint aims to create a shared digital infrastructure for Indian cities.

Explanation

As of the latest information regarding the Bharatmala Pariyojana's progress, Rajasthan consistently ranks among the states with the highest constructed road length. The project focuses on improving national highway efficiency, economic corridors, and connectivity for border and international trade routes. Rajasthan's vast geographical expanse and its strategic location contribute to its substantial share in the road construction under this scheme.

Explanation

Prior to the launch of the Kisan Rin Portal (KRP), the manual process for farmers to claim benefits under the Interest Subvention and Prompt Repayment Incentive schemes involved submitting claims to the Reserve Bank of India (RBI) and the National Bank for Agriculture and Rural Development (NABARD). RBI handled claims for Commercial Banks, while NABARD managed claims for Cooperative Banks and Regional Rural Banks. The KRP has been introduced to digitize and streamline this process.

Explanation

India's foreign exchange reserves have demonstrated a consistent growth trend. As of the end of December 2024, projections indicate that the reserves are expected to increase to approximately USD 640 billion. This accumulation is primarily driven by factors such as strong capital inflows, a favorable balance of payments, and active management by the central bank to maintain financial stability and manage currency volatility.

Explanation

According to the National Family Health Survey (NFHS-5) data for 2019-21, both Jammu and Kashmir and Himachal Pradesh recorded less than 6% of their population as multidimensionally poor. Himachal Pradesh had one of the lowest multidimensional poverty rates in the country, and Jammu and Kashmir also featured among the regions with low poverty levels. Uttar Pradesh, in contrast, had a significantly higher percentage of its population living in multidimensional poverty during the same period.

Explanation

The Perform, Achieve and Trade (PAT) scheme is a market-based mechanism designed to improve energy efficiency in energy-intensive industries, thus aiming to reduce emissions. The Mangrove Initiative for Shoreline Habitats Tangible Incomes (MISHTI) was a significant announcement made in the Union Budget for 2023-24, focusing on mangrove plantations. The Lifestyle for Environment (LiFE) initiative was launched by India at COP26 in Glasgow in November 2021, promoting sustainable lifestyles. Lastly, the National Clean Air Programme (NCAP) was launched in 2019 as a national-level strategy to tackle air pollution.

Explanation

According to the latest available Annual Periodic Labour Force Survey (PLFS) reports, particularly for 2022-23, there has been a notable increase in the Labour Force Participation Rate (LFPR) for rural females compared to urban females. For females aged 15 years and above, the LFPR in rural areas increased from 36.6% in 2021-22 to 41.5% in 2022-23, which is a significant jump of 4.9 percentage points. In contrast, for urban females, the LFPR increased from 24.0% to 25.4% during the same period, an increase of 1.4 percentage points. This indicates a much greater increase in the LFPR of rural females.

Explanation

The Atal Innovation Mission (AIM) was launched by NITI Aayog in 2016 to promote a culture of innovation and entrepreneurship across India. This initiative predates the Science, Technology and Innovation Policy (STIP) 2020 and was therefore not an outcome of it. In contrast, the "One nation, one subscription" model for scientific access and the establishment of Research and Innovation Excellence Frameworks (RIEF) were indeed key recommendations and envisioned outcomes of the STIP 2020.

Explanation

The share of Micro, Small and Medium Enterprises (MSMEs) in India's Gross Value Added (GVA) has shown an increasing trend in recent years. Specifically, the MSME sector's contribution to the country's GVA increased from 27.3% in the financial year 2020-21 to a provisional figure of 30.1% in 2022-23. This highlights the growing importance and contribution of the MSME sector to the Indian economy.

Explanation

The Indian cement industry holds the position of being the second largest producer of cement globally, trailing only behind China. This significant capacity highlights India's crucial role in the global construction materials market and its substantial contribution to infrastructure development. Therefore, the statement that the Indian cement industry is the second largest in the world is correct.

Explanation

Bihar’s Mission Daksh was launched with the primary objective of enhancing the learning outcomes of academically lagging students in government schools. The program aims to identify students in grades 3 to 8 who are struggling to achieve grade-level competencies in subjects like Hindi and Mathematics. Through personalized mentoring and special classes conducted by teachers, Mission Daksh seeks to provide targeted support to these students.

Explanation

The Bihar Startup Policy 2022 is built around the YUVA framework, which encompasses key areas to foster a robust startup ecosystem. YUVA stands for 'Young Innovators Entrepreneurship Development', 'Upliftment of Startup Ecosystem', 'Vibrant Ecosystem in Higher Education Institutions', and 'Accelerators, Mentors Angel Network'. International market expansion schemes, while a potential future goal for successful startups, are not listed as one of the foundational components under the YUVA framework itself.

Explanation

According to economic data for Bihar, both statements A and B are correct. Bihar’s per capita GSDP at current prices has shown robust growth, with figures like 12.8% being plausible for recent years' estimates. Similarly, the tertiary sector consistently contributes a significant majority to Bihar's GSVA, with figures around 58-60% at constant prices being typical. However, the Gross Fixed Capital Formation (GFCF) as a percentage of GSDP in Bihar is considerably higher than 4.6%, typically ranging from 25-30% in recent years, making statement C incorrect. Since A and B are correct, the answer is D (More than one of the above).

Explanation

Demographic projections for Bihar indicate a decline in the proportion of the young population (0-19 years) by 2041 as fertility rates continue to fall, albeit slowly, making statement 1 correct. Bihar is currently experiencing a demographic transition, and its demographic dividend, characterized by a large working-age population, is expected to peak around 2041, which is later than many other Indian states, making statement 2 correct. Statement 3 is not necessarily correct as the sharpness of the rise in the elderly population is complex and might not be steeper than the national average given Bihar's lagging demographic transition.

Explanation

According to the Periodic Labour Force Survey (PLFS) data for Bihar and India generally, a significant proportion of women, particularly in rural areas, are engaged in self-employment. This often includes working as unpaid helpers in household enterprises, such as agriculture or small businesses, which are not considered formal regular wage jobs. Therefore, statement B accurately describes the predominant nature of employment among women in Bihar as per PLFS reports.

Explanation

Article 98(3) of the Indian Constitution grants the power to regulate the recruitment and conditions of service of the secretarial staff of the House of the People (Lok Sabha) to the President. This power is to be exercised after consultation with the Speaker of the House of the People, until Parliament makes a specific law in this regard. This provision ensures the smooth functioning and staffing of the parliamentary secretariat.

Explanation

Article 76(2) of the Indian Constitution clearly outlines the primary duty of the Attorney General of India. It states that the Attorney General is responsible for giving advice to the Government of India on such legal matters, and for performing such other duties of a legal character, as may from time to time be referred or assigned to him by the President. Additionally, he discharges functions conferred on him by the Constitution or any other law.

Explanation

The Seventh Schedule of the Indian Constitution lists subjects under the Union, State, and Concurrent Lists. "Protection of wildlife" (specifically, protection of wild animals and birds) is listed under Entry 17B in the Concurrent List, having been moved from the State List by the 42nd Amendment Act of 1976. "Price control" is also explicitly mentioned under Entry 34 of the Concurrent List. Income on Agriculture and Tax on Electricity consumption or sale, however, fall under the State List.

Explanation

Gandhian Principles in the Directive Principles of State Policy reflect Mahatma Gandhi's vision for rural upliftment, decentralized administration, and social equity. The organization of Village Panchayats (Article 40) and the promotion of cottage industries in rural areas (Article 43) are direct embodiments of Gandhian philosophy. In contrast, the Uniform Civil Code (Article 44) is considered a Liberal-Intellectual principle, and the Right to Work (Article 41) is generally categorized as a Socialist principle, neither of which directly aligns with Gandhian ideals.

Explanation

The 5th Schedule of the Indian Constitution deals with the administration and control of Scheduled Areas and Scheduled Tribes across most states. The 6th Schedule, however, is specific to the administration of tribal areas in only four particular states: Assam, Meghalaya, Tripura, and Mizoram. Therefore, the general statement "Administration of scheduled areas" is not solely and correctly matched with the 6th Schedule; the 5th Schedule is more broadly applicable to scheduled areas.

Explanation

Statement 1 is incorrect because Ministries and Departments are formed by the President under the Government of India (Allocation of Business) Rules, on the advice of the Prime Minister. The Cabinet Secretary assists, but does not form them. Statement 2 is correct as Article 75 of the Constitution mandates that the President appoints other Ministers on the advice of the Prime Minister, and this includes the allocation of specific ministries. Therefore, only statement 2 is true.

Explanation

Article 210 of the Indian Constitution specifies that business in a State Legislature shall be transacted in the official language(s) of the State, or in Hindi, or in English. Option A accurately reflects this constitutional provision. The Advocate General has the right to speak in the legislature but not to vote (Article 177). Discussion on the conduct of High Court judges is prohibited (Article 211). The validity of proceedings cannot be questioned on grounds of procedural irregularity (Article 212).

Explanation

When imposing reasonable restrictions on Fundamental Rights, the judiciary has evolved principles to test their validity. Statement 1, that restrictions must be necessary for the protection of the rights of others, is a key consideration. Statement 2, which states that restrictions must be proportionate to the end sought, encapsulates the doctrine of proportionality, a fundamental test used by courts to ensure that the impact of the restriction is not excessive in relation to the legitimate aim.

Explanation

Article 280 (2) of the Indian Constitution explicitly grants Parliament the power to determine by law the qualifications requisite for appointment as members of the Finance Commission and the manner in which they shall be selected. This ensures that the criteria for appointing members of such a crucial body are established through legislative process.

Explanation

Statement 4 is not true. Prorogation, which ends a session of Parliament or a State Legislature, is formally done by the President (for Parliament) or the Governor (for State Legislature) on the advice of the Council of Ministers, not by the leader of the House alone. Statements 1, 2, and 3 are correct definitions related to parliamentary procedures: summoning is convocation, prorogation ends a session, and dissolution terminates the House.

Explanation

Article 243I of the Indian Constitution mandates that the Governor of a state shall constitute a Finance Commission every five years. The primary function of this Finance Commission is to review the financial position of the Panchayats. It also makes recommendations to the Governor regarding the distribution of net proceeds of taxes, duties, tolls, and fees leviable by the state between the state and the Panchayats, the determination of taxes, duties, tolls, and fees which may be assigned to the Panchayats, and grants-in-aid to the Panchayats from the Consolidated Fund of the State.

Explanation

The Atmanirbhar Bharat Abhiyan (Self-Reliant India Campaign) was launched with the vision of making India a self-reliant nation. Its objectives include boosting domestic manufacturing capabilities, promoting exports across various industries, and reducing India's reliance on imports. The scheme also includes various measures and incentives, such as production-linked incentive (PLI) schemes, designed to attract foreign investments and encourage domestic production, thereby fostering economic growth and job creation. Both statements accurately reflect the goals of the scheme.

Explanation

The main purpose of Panchayati Raj is to promote democratic decentralization and facilitate local self-governance. It aims to empower people at the grassroots level by enabling their direct participation in the planning, implementation, and monitoring of local development programs and administrative functions. This system ensures that decisions affecting local communities are made locally, thereby fostering greater accountability and responsiveness to the needs of the people. While other options like increasing agricultural production or employment can be indirect outcomes, direct public participation in development administration is the core objective.

Explanation

A Censure Motion is fundamentally different from a No-confidence Motion. A Censure Motion expresses strong disapproval of the policy or action of the government or a minister or a group of ministers for specific reasons, which must be stated. If passed, it does not necessarily lead to the resignation of the Council of Ministers. A No-confidence Motion, on the other hand, expresses a lack of confidence in the entire Council of Ministers and, if passed, compels the government to resign.

Explanation

Both the High Courts and the Supreme Court have concurrent jurisdiction regarding the protection of fundamental rights. Under Article 32 of the Constitution, the Supreme Court is empowered to issue writs (habeas corpus, mandamus, prohibition, quo warranto, and certiorari) for the enforcement of fundamental rights. Similarly, under Article 226, High Courts are also empowered to issue these writs, and even other directions or orders, not just for the enforcement of fundamental rights but also for any other legal right.

Explanation

Lala Lajpat Rai was one of the prominent leaders to critically analyze the origins of the Indian National Congress through the 'safety-valve theory'. He presented this idea in his book "Young India" (1916), arguing that the Congress was founded by A.O. Hume with the British intent to provide a safe outlet for the rising political discontent among Indians, thereby preventing a potential rebellion. This theory was used to attack the moderate approach of the early Congress leaders, suggesting their movement was subservient to British interests.

Explanation

Lord Hardinge II was the Viceroy of India from 1910 to 1916. On December 23, 1912, during a ceremonial procession in Delhi marking the transfer of the capital from Calcutta, a bomb was thrown at him. This assassination attempt, known as the Delhi Conspiracy Case, was carried out by Indian revolutionaries led by Rash Behari Bose and Sachin Sanyal. Although injured, Lord Hardinge survived the attack.

Explanation

Lala Har Dayal, a prominent Indian nationalist and revolutionary, was offered and accepted a position as Professor of Indian Philosophy and Sanskrit at the University of California, Berkeley, in 1911. He lectured there for a short period, gaining a reputation for his intellectual prowess. However, his deep involvement in revolutionary activities and anti-British sentiments eventually led to his resignation and further political work abroad, including the founding of the Ghadar Party.

Explanation

Theodore Beck served as the Principal of Muhammadan Anglo-Oriental College, Aligarh, from 1883 until his death in 1899. He was instrumental in shaping the political direction of the Aligarh movement. Beck actively encouraged Muslim communalism by advising Sir Syed Ahmed Khan and other Muslim leaders to refrain from joining the Indian National Congress and instead focus on establishing a separate political identity for Muslims, often aligning them with British interests against the emerging nationalist movement.

Explanation

'Young India' was a weekly journal published by Mahatma Gandhi from 1919 to 1931. He used this publication as a crucial platform to spread his unique ideology of non-violent resistance, Swaraj (self-rule), and various social and political reforms. Through its pages, Gandhi articulated his views on important national issues and educated the public about the principles and strategies of the Indian independence movement.

Explanation

The Simon Commission, appointed in 1927 by the British government to review the working of the Government of India Act 1919 and propose constitutional reforms, caused widespread resentment in India. The commission consisted solely of seven British members, with no Indian representation. This exclusion of Indians from a body meant to determine India's future deeply offended all political groups and parties, leading to a complete boycott of the commission upon its arrival in India.

Explanation

Subhash Chandra Bose assumed the leadership of the Indian National Army (INA) in 1943 in Singapore, reorganizing and revitalizing it. Under his dynamic command, the INA became a powerful symbol of armed resistance against British rule. He famously gave the inspiring battle cry, "Chalo Delhi" (On to Delhi), motivating the soldiers to march towards India to liberate it from British control.

Explanation

The powerful declaration, "We shall either free India or die in the attempt; we shall not live to see the perpetuation of our slavery," was famously uttered by Mahatma Gandhi. This stirring call to action was made during his speech at the Gowalia Tank maidan in Bombay (now Mumbai) on August 8, 1942, marking the launch of the Quit India Movement. It urged Indians to make the ultimate sacrifice for the nation's independence, embodying the 'Do or Die' spirit.

Explanation

The slogan "Divide and Quit" was a political cry primarily associated with Muhammad Ali Jinnah and the All-India Muslim League. It emerged as a counter-demand to Mahatma Gandhi's "Quit India" movement. While the Indian National Congress demanded that the British 'Quit India' unconditionally, Jinnah and the Muslim League insisted on a prior division of India into separate Hindu and Muslim states ("Divide") before the British departed ("Quit"), reflecting their demand for Pakistan.

Explanation

The Indian Independence Act, 1947, was the crucial legislation that formally provided for the partition of British India into two independent dominions: India and Pakistan. This Act was passed by the British Parliament on July 18, 1947, and it stipulated the end of British rule in India, the creation of two separate self-governing dominions, and the transfer of power to their respective constituent assemblies from August 15, 1947.

Explanation

Annie Besant, a prominent leader of the Home Rule League, actively worked to establish and strengthen its branches across India. She visited Bihar in 1918 to further the activities of the Home Rule League in the region, presiding over a conference in Patna. Her efforts were crucial in popularizing the demand for self-rule.

Explanation

The Champaran Agrarian Committee was appointed in 1917 following Mahatma Gandhi's successful Satyagraha in the district. The committee was formed as a direct result of the agreement reached between the Indian Government (then under British rule) and Mahatma Gandhi, who represented the grievances of the indigo cultivators. Gandhi himself was a member of this investigative committee.

Explanation

Swami Sahajanand Saraswati was the undisputed leader of the Kisan Sabha movement in Bihar. He founded the Bihar Provincial Kisan Sabha (BPKS) in 1929 to mobilize peasants against zamindari oppression and exploitation. His organizational skills and advocacy led to the widespread growth of the peasant movement, eventually culminating in the formation of the All India Kisan Sabha.

Explanation

During the Quit India Movement in 1942, many individuals were martyred while attempting to hoist the national flag. At Bikram Police Station in Patna district, a young student named Mahendra Singh was killed by police firing while endeavoring to hoist the national flag. Since Mahendra Singh is not listed among the given options, "None of the above" is the correct choice.

Explanation

Shri Krishna Singh (also known as Shri Krishna Sinha) became the first Premier (Chief Minister) of Bihar in July 1937 after the provincial elections held under the Government of India Act 1935. He continued to hold this position until his ministry resigned in October 1939 in protest against India's involvement in World War II. Therefore, in March 1939, Shri Krishna Singh was the Chief Minister of Bihar.

Explanation

Karnasuvarna was the capital of the Gauda kingdom, located in present-day West Bengal. Pragjyotish was an ancient kingdom in the region of modern Assam. Girnar is a historical site in Gujarat, famous for its rock edicts. Pratishthan, also known as Paithan, was the capital of the Satavahana dynasty, situated in present-day Maharashtra.

Explanation

Ghosha, Apala, and Vishvavara were all women sages or Rishikas mentioned in the Rigveda, known for composing hymns. Gargi Vachaknavi, however, was a prominent philosopher and debater during the later Vedic or Upanishadic period, known for her dialogues with Yajnavalkya described in the Brihadaranyaka Upanishad, not the Rigvedic period.

Explanation

The Chola Gangam Lake was a massive artificial lake created by the Chola emperor Rajendra I. Dharma Mahamatras were special officers appointed by Emperor Ashoka to spread Dhamma and ensure public welfare. The Assembly at Prayag, a grand religious congregation, was famously organized by Emperor Harshavardhan every five years. The Sudarshan Lake was initially built by Pushyagupta, a governor under Chandragupta Maurya.

Explanation

Among the given rulers, Bahlol Lodi ruled for the maximum period. Alauddin Khilji ruled from 1296-1316 (20 years). Muhammad bin Tughluq ruled from 1325-1351 (26 years). Bahlol Lodi ruled from 1451-1489 (38 years). Balban ruled from 1266-1287 (21 years).

Explanation

The chronological order of these ancient Indian dynasties is as follows: The Maurya Dynasty (c. 322-185 BCE) was succeeded by the Shunga Dynasty (c. 185-73 BCE). The Shungas were then followed by the Kanva Dynasty (c. 73-28 BCE). The Kushana Dynasty emerged later, ruling from approximately the 1st century CE to the 3rd century CE.

Explanation

Sahitya Lahari is a renowned literary work attributed to the famous Bhakti poet Surdas, known for his devotion to Lord Krishna. In contrast, Geetavali, Vinay Patrika, and Kavitavali are well-known compositions by Goswami Tulsidas, a prominent saint and poet who wrote in Awadhi and Brajbhasha, famous for his devotion to Lord Rama, most notably through his epic Ramcharitmanas.

Explanation

The Kabuli Bagh Mosque was built by Babur in Panipat. The Adhai Din Ka Jhopra, an early Indo-Islamic monument, was constructed by Qutb ud-Din Aibak in Ajmer. The strategically important Allahabad Fort was built by the Mughal emperor Akbar. The exquisite Itmad-ud-Daulah Mausoleum, often considered a precursor to the Taj Mahal, was commissioned by Nur Jahan for her father Mirza Ghiyas Beg.

Explanation

James Augustus Hicky is famously associated with starting "Hicky's Bengal Gazette" in 1780, which was the first newspaper published in India. The "Calcutta Chronicle" was a different newspaper that began publication later, founded by Francis Gladwin. The other pairs are correctly matched: Dayananda Saraswati authored "Satyarth Prakash", Ramaswamy Naicker was a leading figure of the Justice Party, and Jyotirao Phule founded the Satyashodhak Samaj.

Explanation

Babar was the father of Kamran, Humayun, Askari, and Hindal. Akbar was the father of Salim (who later became Emperor Jahangir), Murad, and Daniyal. Shah Jahan's sons included Dara Shikoh, Aurangzeb, Murad Baksh, and Shah Shuja. Jahangir was the father of Khusrau, Khurram (who later became Emperor Shah Jahan), Parviz, and Shahryar.

Explanation

The First Buddhist Council was held at Rajagriha, the Second at Vaishali, and the Third at Pataliputra. All three of these locations are situated in the modern-day state of Bihar, India. However, the Fourth Buddhist Council was held in Kundalvan, Kashmir, during the reign of Kanishka, placing it outside the geographical boundaries of Bihar.

Explanation

Subhas Chandra Bose was elected President of the Indian National Congress at the Haripura session in 1938, and subsequently re-elected at the Tripuri session in 1939. Thus, statement 1 is incorrect as it wrongly states the Tripuri session occurred in 1938. Statement 2 is correct; he famously escaped from house arrest in Calcutta in January 1941, beginning his 'Great Escape' disguised as Ziauddin. Statement 3 is also correct; on October 21, 1943, he proclaimed the establishment of the Provisional Government of Free India (Arzi Hukumat-e-Azad Hind) in Singapore, with himself as the head of state, prime minister, and minister for war and foreign affairs. Therefore, statements 2 and 3 are accurate.

Explanation

Kautilya, also known as Chanakya or Vishnugupta, was an ancient Indian statesman and philosopher who served as an advisor to Chandragupta Maurya in the 4th-3rd century BCE. His famous work, Arthashastra, is a treatise on statecraft, economic policy, and military strategy. Nalanda University, on the other hand, flourished primarily from the 5th to the 12th centuries CE, centuries after Kautilya's time. Therefore, Kautilya could not have been an Acharya (teacher) at Nalanda Vishvavidyalaya. Nagarjuna, Sheelbhadra (Silabhadra), and Shantirakshit (Shantarakshita) were all prominent Buddhist scholars and Acharyas associated with Nalanda during its period of prominence.

Explanation

To determine the correct chronological order, we must recall the approximate years of each event. The Battle of Wandiwash occurred in 1760, which was a decisive battle in the Third Carnatic War, establishing British supremacy over the French in India. The death sentence to Raja Nand Kumar, a prominent Bengali figure, took place in 1775, amidst controversies involving Governor-General Warren Hastings. The Treaty of Salbai, which concluded the First Anglo-Maratha War, was signed in 1782. Finally, Tipu Sultan, the ruler of Mysore, died in 1799 during the Fourth Anglo-Mysore War. Arranging these events by year gives the sequence: 3 (1760), 1 (1775), 2 (1782), 4 (1799).

Explanation

The history of early journalism in Bihar indicates that 'Patna Harkara' was among the very first newspapers to be published in the region, with some historical accounts placing its publication as early as 1826. This makes it older than the other options. 'Akhbar-E-Bihar' started in 1856, generally considered the first Urdu newspaper from Bihar. 'Bihar Bandhu' was launched in 1872 (initially from Calcutta, then Patna in 1874) and is regarded as the first Hindi newspaper of Bihar. 'Bihar Herald', founded in 1875 by Guru Prasad Sen, holds the distinction of being the first English newspaper published from Bihar. Therefore, 'Patna Harkara' predates the others in overall publication history.

Explanation

The Champaran Satyagraha (a), initiated by Mahatma Gandhi in 1917, saw prominent local leaders like Dr. Rajendra Prasad (4) play a crucial role in assisting the farmers. Azad Dasta (b) was a guerrilla organization formed during the Quit India Movement in 1942, with Jayaprakash Narayan (1) emerging as its most significant leader after his escape from jail. The Individual Satyagraha in Bihar in 1940 (c) saw leaders like Shyam Narayan Singh (2) actively participating and leading the movement in various parts of the province. The Kisan Sabha Bihar (d), particularly the Bihar Provincial Kisan Sabha, was founded and extensively led by Swami Sahajanand Saraswati (3) from the late 1920s, advocating for peasant rights. Thus, the correct matching sequence is a-4, b-1, c-2, d-3.

Explanation

The Maginot Line was an extensive line of concrete fortifications, obstacles, and weapon installations built by France in the 1930s. Its primary purpose was to deter a German invasion and force any attacking army to go around the fortifications, thereby allowing France time to mobilize its army. Therefore, it exists between France and Germany.

Explanation

The Strait of Hormuz is a strategically vital waterway that connects the Persian Gulf on one side to the Gulf of Oman and the Arabian Sea on the other. It is a narrow passage through which a significant portion of the world's oil supply passes, making it a critical choke point for international maritime trade.

Explanation

"Ground Zero" is a term commonly associated with the site of the former World Trade Center towers in New York City, following the September 11, 2001, terrorist attacks. This location in Lower Manhattan became the epicenter of the recovery and rebuilding efforts, and now hosts the National September 11 Memorial Museum.

Explanation

The Kra Isthmus, located in southern Thailand, has historically been known as the ‘Devil’s Neck’. This narrow strip of land connects the Malay Peninsula with the mainland of Asia. Its strategic location and the challenging terrain for ancient travelers and traders contributed to its nickname.

Explanation

Ladang is a local term used primarily in Southeast Asian countries like Indonesia and Malaysia to refer to a specific type of agriculture. It is a form of shifting cultivation, also known as slash-and-burn agriculture, where small plots of land are cleared, cultivated for a few seasons, and then left fallow to regenerate before being used again.

Explanation

Majuli Island, located in the Brahmaputra River in Assam, India, is officially recognized as the largest river island in the world. It holds significant cultural and ecological importance, being a hub of Assamese neo-Vaishnavite culture. Its unique geographical formation attracts tourists and researchers alike.

Explanation

The Ganga-Brahmaputra-Meghna basin is the largest river basin in India. Following this, the Godavari river basin is the second largest in the country, covering a vast area in peninsular India. It is a vital river system for irrigation and water supply in the states it traverses.

Explanation

Devprayag is the sacred confluence point where the Alaknanda River meets the Bhagirathi River. This confluence is highly significant in Hindu mythology and is considered the place where the river officially takes the name Ganga. It is one of the five holy confluences known as the Panch Prayag.

Explanation

The two volcanic islands in Indian territory are Narcondam and Barren Island, both situated in the Andaman Sea. Barren Island is notable for being India's only confirmed active volcano, with recorded eruptions in recent decades. Narcondam is classified as a dormant volcano.

Explanation

The city of Meerut has a historical and renowned craftsmanship for making scissors, which has earned it a Geographical Indication (GI) tag. This recognition highlights the unique quality and traditional manufacturing process associated with scissors from Meerut, distinguishing them in the market.

Explanation

The Temperate Forest Research Centre (TFRI) is a prominent institution dedicated to forestry research in temperate regions of India. It is located in Shimla, the capital city of Himachal Pradesh. This center operates under the Indian Council of Forestry Research and Education (ICFRE), an autonomous organization under the Ministry of Environment, Forest and Climate Change, Government of India. Its mandate includes research on ecological restoration, biodiversity conservation, and sustainable management of temperate forest ecosystems.

Explanation

Kanha National Park is a well-known national park and tiger reserve situated in the Mandla and Balaghat districts of Madhya Pradesh, India. It is renowned for its significant population of Royal Bengal Tigers, leopards, sloth bears, and various species of deer, including the rare hardground barasingha. The park's picturesque landscapes, comprising sal and bamboo forests, grasslands, and streams, inspired Rudyard Kipling's famous work, The Jungle Book. It was declared a national park in 1955 and a tiger reserve in 1973.

Explanation

Loktak is a large freshwater lake located in Manipur, Northeast India. It is particularly famous for its unique floating circular swamps, locally known as phumdis, which are a heterogeneous mass of vegetation, soil, and organic matter. The Keibul Lamjao National Park, the world's only floating national park, is situated on these phumdis and is the last natural refuge of the endangered sangai, or Manipur brow-antlered deer. The lake is a Ramsar site and plays a crucial role in the ecological and economic life of the region.

Explanation

Valmiki National Park is the only national park and tiger reserve in Bihar, India. Located in the West Champaran district, on the border with Nepal, it encompasses both a national park and a wildlife sanctuary. This area was designated as the Valmiki Tiger Reserve under Project Tiger in 1990. It is a significant protected area known for its rich biodiversity, including tigers, leopards, bears, and various species of deer. The reserve plays a crucial role in conservation efforts in the Gangetic Plains.

Explanation

The state animal of Bihar is the Gaur, also known as the Indian Bison. The Gaur is the largest extant bovine native to South and Southeast Asia. While the official name is Gaur or Indian Bison, among the given options, "Bull" is the most appropriate and common general term for a male of this species, which is known for its imposing size and strength. Therefore, option B, Bull, correctly represents the state animal in a simplified context.

Explanation

Nalanda University, envisioned as an international institution and a revival of the ancient center of learning, was officially re-established under the Nalanda University Act of 2010. The university began its first academic session on September 1, 2014, making 2014 the year of its operational re-establishment in Bihar. It is located near the historic site in Rajgir.

Explanation

The Karmanasa river is a significant river in eastern India, forming a boundary between the states of Bihar and Uttar Pradesh. It originates in the northern part of the Kaimur range, specifically within the Kaimur District of Bihar. The river then flows generally northwest before joining the Ganges river near Chausa.

Explanation

Bihar is the only state in India that produces pyrite, a mineral primarily used in the manufacture of sulphuric acid. The entire known reserves and production of pyrite in the country are concentrated within Bihar, predominantly in the Rohtas district. Therefore, Bihar accounts for 100% of India's pyrite output.

Explanation

Significant reserves of gold have been identified in various parts of Bihar. The Jamui district has been found to possess the largest share of these gold reserves, particularly in areas like Sono. Geological surveys confirm the presence of gold-bearing ore in this region, making Jamui a key district for gold in Bihar.

Explanation

Most of Bihar experiences a subtropical monsoon climate. This climate type is characterized by three main seasons: a hot dry summer, a wet monsoon season from June to September, and a cool dry winter. The state's location in the Gangetic plains and its dependence on the seasonal monsoon winds define this climatic pattern.

Explanation

When a body is pushed on a floor at a constant velocity, its acceleration is zero. According to Newton's Second Law of Motion, the net force acting on the body must be zero (Fₙet = ma = m * 0 = 0). Since a force of 200 Newtons is applied, the friction force opposing the motion must be equal in magnitude to this applied force to maintain zero net force and thus constant velocity. Therefore, the friction force is 200 Newtons.

Explanation

First, calculate the acceleration using the kinematic equation s = ut + (1/2)at². Given s = 400 m, u = 0 m/s (starts from rest), and t = 20 s, we get 400 = 0 + (1/2)a(20)², which simplifies to 400 = 200a, so a = 2 m/s². Next, convert the mass of the truck from 7 tons to kilograms: 7 tons = 7 1000 kg = 7000 kg. Finally, use Newton's Second Law, F = ma, to find the force: F = (7000 kg) (2 m/s²) = 14000 Newtons.

Explanation

One "unit" of energy consumed in a home typically refers to 1 kilowatt-hour (kWh). To convert kilowatt-hours to Joules, we use the conversion factor: 1 kWh = 3.6 x 10⁶ Joules. Therefore, 250 units of energy is equal to 250 kWh. Multiplying this by the conversion factor, we get 250 x 3.6 x 10⁶ Joules = 900 x 10⁶ Joules. This can be written as 9 x 10⁸ Joules.

Explanation

The speed of sound depends on the density and elasticity (stiffness) of the medium. Sound travels fastest in solids, then liquids, and slowest in gases. This is because particles in solids are more closely packed and can transmit vibrations more efficiently. Among the given options, steel is a solid, water is a liquid, and air and hydrogen are gases. Therefore, the speed of sound is maximum in steel.

Explanation

When a body falls freely, its gravitational potential energy (which depends on its height) continuously decreases because its height decreases. Simultaneously, its speed increases, which means its kinetic energy increases. According to the principle of conservation of mechanical energy, in the absence of non-conservative forces like air resistance, the total mechanical energy (potential energy + kinetic energy) remains constant. The decrease in potential energy is exactly compensated by an increase in kinetic energy, thus the principle of conservation of energy is not violated.

Explanation

The work done (W) is calculated by the formula W = Force (F) x Displacement (d). In this problem, the force exerted by the oxen is 140 Newton and the distance ploughed is 15 meters. Therefore, W = 140 N x 15 m = 2100 Joule.

Explanation

A plane mirror can be considered a special case of a spherical mirror with an infinitely large radius of curvature. The focal length (f) of a mirror is half of its radius of curvature (R), i.e., f = R/2. Since the radius of curvature of a plane mirror is infinite, its focal length is also infinite.

Explanation

Electric power (P) in an electric circuit can be expressed in several ways based on Ohm's Law (V = IR). The common formulas for power are P = VI (voltage x current), P = I²R (current squared x resistance), and P = V²/R (voltage squared / resistance). The term IR² does not represent electric power and is dimensionally incorrect for power.

Explanation

A short circuit occurs when there is a very low resistance path between two points in an electrical circuit that are meant to be at different voltages. According to Ohm's Law, Current (I) = Voltage (V) / Resistance (R). When the resistance (R) in a circuit becomes very low due to a short circuit, the electric current (I) increases very dramatically, often leading to overheating and potential damage.

Explanation

A fuse is a safety device used in an electric circuit to protect electrical equipment from damage due to overcurrent. If the current flowing through the circuit exceeds a predetermined safe limit, the metallic wire in the fuse melts, thereby breaking the circuit and cutting off the power supply, preventing the equipment from being damaged by excessive current.

Explanation

For a strong acid like HCl, the normality (N) is equal to its molarity (M) because it provides one H+ ion per molecule. A 0.1 N HCl solution means its molarity is 0.1 M. The concentration of hydrogen ions [H+] is therefore 0.1 M, which can be written as 10⁻¹ M. The pH is calculated using the formula pH = -log[H+]. Substituting the value, pH = -log(10⁻¹) = 1.0.

Explanation

Night glowing pigments are materials that exhibit phosphorescence, meaning they absorb light energy and then slowly re-emit it as visible light over a period, even after the light source is removed. Europium-doped strontium aluminate is a modern, highly efficient phosphorescent pigment known for its bright and long-lasting glow, making it a popular choice for glow-in-the-dark applications and safety signage.

Explanation

Smart films, often utilized in smart windows or switchable glass, require transparent conductive materials to function. Indium tin oxide (ITO) is a well-established transparent conductive oxide that is widely used in these applications. It acts as an electrode, allowing for the application of an electric field across the active material within the film, thereby changing its optical properties like transparency or tint on demand.

Explanation

Platinum-based compounds are a crucial class of chemotherapeutic agents widely used in the treatment of various types of carcinoma and other cancers. Drugs such as cisplatin, carboplatin, and oxaliplatin are well-known platinum compounds that work by cross-linking DNA within cancer cells, which ultimately inhibits cell division and leads to their death.

Explanation

Contraceptive pills function by delivering synthetic hormones to prevent pregnancy. Levonorgestrel is a synthetic progestin hormone that is commonly used in various forms of contraception, including oral contraceptive pills (both combined and progestin-only), emergency contraceptive pills, contraceptive implants, and intrauterine systems (IUS). It primarily works by preventing ovulation and thickening cervical mucus.

Explanation

Oil is not stored in galvanized iron pots because the zinc coating on galvanized iron can react with certain components in oil. This reaction can lead to the formation of toxic compounds, especially if the oil contains acidic impurities. Furthermore, the interaction can reduce the quality of the oil by causing degradation or promoting rancidity. Additionally, the zinc coating itself may corrode over time, contaminating the oil with corrosion products. Therefore, all the listed reasons contribute to why galvanized iron is unsuitable for oil storage.

Explanation

Tetraethyllead (TEL) is a chemical compound that was historically widely used as an additive in gasoline to increase its octane rating. The octane rating is a measure of a fuel's resistance to knocking or pre-ignition in internal combustion engines. TEL was an effective anti-knocking agent, though its use has been largely phased out due to environmental and health concerns related to lead emissions.

Explanation

PHBV is a well-known biodegradable polymer. Its full form is Poly (3-Hydroxybutyrate-co-3-Hydroxyvalerate). This name indicates that it is a copolymer composed of two different monomer units: 3-hydroxybutyrate and 3-hydroxyvalerate. PHBV belongs to the class of polyhydroxyalkanoates (PHAs), which are naturally occurring polyesters produced by various microorganisms.

Explanation

Hormones are chemical messengers that are secreted directly into the bloodstream to regulate various physiological processes. These secretions occur from specialized glands known as endocrine glands. Unlike exocrine glands, which release their secretions through ducts to external surfaces or into body cavities, endocrine glands are ductless and release hormones directly into the circulatory system. Reproductive glands are an example of endocrine glands that secrete hormones.

Explanation

The interaction between the herpes simplex virus and a human is best characterized as endoparasitism. Viruses are obligate intracellular parasites, meaning they must live and replicate inside the cells of a host organism, deriving nutrients and resources from the host. In this case, the herpes simplex virus lives inside human cells and often causes harm, such as cold sores or genital lesions, fitting the definition of an endoparasite which lives within the host's body.

Explanation

IgM is the first class of antibody (immunoglobulin) produced and secreted by plasma cells in response to a primary infection. It is found predominantly in the blood and lymph fluid and is particularly effective at activating the complement system and agglutinating antigens. Its early production is crucial for the initial containment of pathogens.

Explanation

Biological membranes are complex structures primarily composed of a lipid bilayer, in which various proteins are embedded or associated. This lipid and protein composition is highly variable, being specific to the particular species, cell type, and organelle, allowing for diverse functions and properties. The fluid mosaic model describes this dynamic arrangement.

Explanation

Non-sense codons, also known as stop codons, signal the termination of protein synthesis during translation. The three universal stop codons are UAA, UAG, and UGA. Among the given options, UAA is a non-sense codon. AUG, in contrast, is typically the start codon, coding for methionine.

Explanation

According to the IUCN Red List classification, species that are in danger of extinction are categorized based on their risk level. 'Endangered' species face a very high risk of extinction in the wild, signifying that their population numbers have declined severely or their habitat has been drastically reduced. 'Vulnerable' species face a high risk, while 'Extinct' species no longer exist.

Explanation

Kharif crops are crops that are sown with the onset of the monsoon (usually June-July) and harvested after the monsoon rains (typically September-October). Sugarcane is predominantly a Kharif crop, as its main growth period relies heavily on the monsoon rainfall. Barley, Gram (chickpea), and Wheat are examples of Rabi crops, which are sown in winter and harvested in spring.

Explanation

Xylem is a complex vascular tissue in plants responsible for the long-distance transport of water and dissolved mineral nutrients from the roots to all aerial parts of the plant. This upward movement, driven by transpiration pull, is essential for photosynthesis, cooling the plant, and maintaining turgor pressure in cells. The primary components of xylem, such as tracheids and vessel elements, form a continuous system for efficient water conduction.

Explanation

Augustin Pyramus de Candolle, a Swiss botanist, is widely recognized for being among the first to systematically use anatomical features, including the presence and characteristics of vascular tissues, in the classification of plants. In his influential work "Théorie élémentaire de la botanique" (1813) and later in his "Prodromus Systematis Naturalis Regni Vegetabilis," he classified plants into "vascular" and "cellular" groups, thereby highlighting the significance of internal structure for taxonomic purposes. This approach represented a shift towards a more natural system of classification.

Explanation

The mango fruit is classified as a drupe, which is characterized by a fleshy outer part surrounding a single hard shell (pit) containing the seed. The pericarp, or fruit wall, in a mango is differentiated into three distinct layers. The outermost layer is the epicarp, which is the peel. The innermost layer is the endocarp, which forms the hard, stony pit. The fleshy, juicy, and edible part of the mango that is consumed is the middle layer, known as the mesocarp.

Explanation

Ozone Day, officially known as the International Day for the Preservation of the Ozone Layer, is celebrated annually on 16th September. This date commemorates the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987, a landmark international treaty designed to protect the Earth's ozone layer by phasing out the production of numerous substances responsible for ozone depletion. The day aims to raise awareness about the importance of the ozone layer and the need for continued global cooperation to protect it.

Explanation

In a mycorrhizal association, which is a symbiotic relationship between a plant and a fungus, the plant derives several significant advantages. The fungal hyphae extend far into the soil, greatly increasing the surface area available for the plant's roots to absorb water and essential mineral nutrients, particularly phosphorus and nitrogen, which might otherwise be inaccessible. Additionally, the fungal partner provides protection to the plant roots against various soil-borne pathogens and diseases, thereby enhancing the plant's overall health and resilience.