SSC CGL Tier 1 2013 General Awareness Questions with Solutions

Explanation

The Noise Pollution (Regulation and Control) Rules, 2000, framed under the Environment (Protection) Act, 1986, prescribe the ambient air quality standards in respect of noise for different areas in India. These regulations categorize locations into four distinct zones: Industrial, Commercial, Residential, and Silence. For a Silence Zone, which typically encompasses areas within 100 meters of hospitals, educational institutions, and courts, the permissible noise limit is 40 dB during the night-time. In Residential Areas, the acceptable noise limit is established at 45 dB during the night. These specific decibel levels are identified as the maximum acceptable limits to ensure a conducive environment for rest and to prevent noise-induced health issues, thereby defining the standard range for acceptable noise pollution in sensitive Indian environments.

Explanation

Externality theory is the foundational framework of Environomics, also known as Environmental Economics. It explains situations where the economic activities of one agent affect the well-being of another without any financial compensation or market transaction. In the context of the environment, negative externalities such as industrial pollution or carbon emissions represent market failures where the private cost of production is lower than the social cost. Environomics utilizes this theory to analyze these discrepancies and develop policy instruments, such as Pigouvian taxes or tradable permits, aimed at internalizing external costs to reach a socially optimal level of resource use and environmental protection.

Explanation

Jawaharlal Nehru, the first Prime Minister of India, famously described multi-purpose river valley projects as the temples of modern India during the inauguration of the Bhakra Nangal Dam in 1954. He believed that these massive engineering feats were essential for the nation's progress as they integrated the development of agriculture with rapid industrialization. By providing irrigation, controlling floods, and generating hydroelectric power, these projects served as the backbone of economic self-reliance. Nehru viewed these dams and power stations as symbols of scientific thinking and human endeavor that would uplift the socio-economic conditions of the people and lead the newly independent nation toward modernization.

Explanation

Digital circuits are designed to operate using electronic components like transistors that function as switches. These switches exist in two distinct physical states: a high-voltage state representing logic 1 and a low-voltage or zero-voltage state representing logic 0. Because these circuits rely on two stable states to represent and process data, they fundamentally utilize the binary system. All complex information, from numerical data to high-level instructions, is ultimately converted into sequences of these binary digits, known as bits, which the physical hardware can interpret and manipulate through logic gates.

Explanation

Sunderlal Bahuguna was a renowned Indian environmentalist and social activist, widely recognized for his leadership in the Chipko movement. He dedicated his life to the preservation of the Himalayan ecosystem and the protection of forests through non-violent Gandhian methods. His advocacy focused on ecological conservation and opposition to large-scale projects like the Tehri Dam, which he believed would cause irreversible environmental damage. Unlike individuals who pursue careers in elective office or party administration, Bahuguna remained a grassroots activist and a leading voice in the global environmental movement, earning honors such as the Padma Vibhushan for his contributions to nature and society.

Explanation

Mahatma Gandhi conferred the title of Mahamana upon Pandit Madan Mohan Malviya in recognition of his noble character and his selfless service to the Indian nation. The term Mahamana translates to one who is high-minded or a Great Soul. Gandhi held Malviya in high esteem for his dedication to social reform and his monumental contribution to Indian education, most notably as the founder of the Banaras Hindu University in 1916. Malviya was a four-time president of the Indian National Congress and played a significant role in the independence movement, leading Gandhi to honor him with this distinctive title.

Explanation

Tulsi Gabbard was elected to the United States House of Representatives in November 2012, representing Hawaii's 2nd congressional district. Upon taking her oath of office in January 2013, she became the first Hindu-American to serve in the US Congress. She gained significant attention for being the first member of the federal legislature to be sworn in using the Bhagavad Gita. Although the question uses the term senator, she is the historically recognized first Hindu individual to enter the House of Representatives.

Explanation

Egg yolk is a highly concentrated source of nutrients required for the development of an embryo. It contains approximately 16 percent protein and about 33 percent fat. The lipid component consists of triglycerides, phospholipids such as lecithin, and cholesterol. The proteins present in the yolk are primarily lipoproteins and phosphoproteins like vitellin. This combination makes egg yolk a significant dietary source of both proteins and fats.

Explanation

Lord Linlithgow served as the Viceroy and Governor-General of India from 1936 to 1943, making him the longest-serving Viceroy in Indian history. The Quit India Movement, also known as the August Movement, was launched on August 8, 1942, following the failure of the Cripps Mission. As the head of the British administration at the time, Lord Linlithgow was responsible for the immediate and forceful suppression of the movement, which included the arrest of Mahatma Gandhi and almost the entire top leadership of the Indian National Congress within hours of the Quit India Resolution being passed in Bombay.

Explanation

The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for the assessment of climate change. It was established in 1988 by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) to provide policymakers with regular scientific assessments regarding climate change, its implications, and potential future risks, as well as to put forward adaptation and mitigation strategies. The IPCC is a scientific body that reviews and assesses the most recent scientific, technical, and socio-economic information produced worldwide relevant to the understanding of climate change. It is most widely recognized for its comprehensive Assessment Reports, which play a crucial role in international climate negotiations and policy formulation.

Explanation

Pt. Jawaharlal Nehru described the Government of India Act, 1935 as a new charter of bondage because he believed that the act, while appearing to grant concessions, actually reinforced British imperialist control over India. He argued that the extensive discretionary powers and safeguards vested in the Governor-General and the provincial Governors made the promised provincial autonomy a sham. Nehru famously criticized the structure of the act by comparing it to a machine that had all the brakes but no engine, emphasizing that it lacked any real mechanism for the transfer of power to the Indian people and was designed to keep the nation in a state of perpetual colonial servitude.

Explanation

The Endosulfan tragedy occurred in the Kasaragod district of Kerala, where the pesticide was aerially sprayed on cashew plantations owned by the Plantation Corporation of Kerala for over two decades starting in the mid-1970s. The objective was to control the tea mosquito bug, but the continuous use of this organochlorine pesticide led to catastrophic environmental pollution and severe health crises among the local population. Residents suffered from a range of debilitating conditions, including congenital deformities, physical disabilities, mental retardation, and disorders of the central nervous system. The scale of the human suffering and environmental degradation in the cashew-growing hills of Kasaragod eventually led to a massive public health campaign and a landmark legal struggle, resulting in a ban on the production and use of Endosulfan in the state and subsequently across the country.

Explanation

Functional Finance is an economic theory developed by Abba P. Lerner in the 1940s which asserts that government fiscal policy should be evaluated based on its results rather than its adherence to traditional principles like a balanced budget. The core idea is that the government should use its powers of taxing, spending, and borrowing to achieve specific macroeconomic objectives, primarily full employment and price stability. According to Lerner, the government should increase spending or lower taxes to boost aggregate demand when there is unemployment, and conversely, it should increase taxes or reduce spending to curb inflation. In this framework, the national debt and budget deficits are viewed as tools to regulate the economy rather than as inherently negative outcomes to be avoided.

Explanation

The farad (symbol: F) is the SI derived unit of electrical capacitance, named in honor of the English physicist Michael Faraday. Capacitance is a measure of the ability of a body or an electronic component, such as a capacitor, to store an electric charge. It is defined by the ratio of the electric charge Q on each conductor to the potential difference V between them, expressed by the formula C = Q / V. One farad is the capacitance across which a potential difference of one volt results in a charge of one coulomb. Because the farad is a very large unit of capacitance for practical electronic circuits, values are typically expressed in smaller sub-multiples such as the microfarad (), nanofarad (nF), or picofarad (pF).

Explanation

Impact printers function by physically striking a print head or character mechanism against an inked ribbon to create an image or text on paper. The daisy wheel printer is a specific type of impact printer that utilizes a circular wheel with petal-like spokes, each containing a molded character. During the printing process, the wheel rotates to position the desired character in front of a hammer, which then strikes the character against the ribbon and the paper to produce a high-quality, letter-perfect impression similar to that of a typewriter.

Explanation

Microwaves are categorized as an unguided or wireless transmission medium because they propagate through the atmosphere or free space using electromagnetic waves. Unlike physical cabling, unguided media do not require a solid conductor to transmit signals. The other terms in this group are classified as guided or wired transmission media, which utilize physical structures such as glass, plastic, or copper to contain and direct the signal along a specific path. In networking, the primary distinction is based on the physical nature of the transmission path, making wireless radiation the odd term among physical cable types.

Explanation

Chittaranjan Das, along with Motilal Nehru, established the Congress-Khilafat Swarajya Party, popularly known as the Swaraj Party, in January 1923. Following the suspension of the Non-Cooperation Movement, a division emerged within the Indian National Congress at the 1922 Gaya session. Chittaranjan Das, who presided over the session, advocated for entering the legislative councils to wreck the colonial government from within, a stance supported by Motilal Nehru. When their proposal was defeated by the no-changers, they resigned from their posts to form the Swaraj Party. Chittaranjan Das served as the president of the new party, while Motilal Nehru held the position of secretary, aiming to provide a political alternative and maintain momentum in the freedom struggle through parliamentary obstruction.

Explanation

The Fundamental Duties are enshrined in Part IVA of the Indian Constitution. This specific part was not included in the original document but was added by the 42nd Constitutional Amendment Act in 1976. It contains only one article, Article 51A, which initially prescribed ten duties for citizens. These provisions were based on the recommendations of the Swaran Singh Committee to ensure that citizens are mindful of certain basic norms of democratic conduct alongside their fundamental rights. Later, the 86th Constitutional Amendment Act of 2002 added an eleventh duty concerning the education of children.

Explanation

The Deputy Chairman of the Planning Commission is accorded the rank of a Cabinet Minister in the Union Cabinet according to the Table of Precedence of India. This position is placed at Rank 7, which it shares with Union Cabinet Ministers, Chief Ministers of States within their respective states, the Leader of the Opposition in the Rajya Sabha and Lok Sabha, and former Prime Ministers. This status was granted to ensure that the head of the country's premier planning body possessed the requisite administrative authority to interact effectively with various Union Ministries and State Governments. Although the Planning Commission was an advisory body created by an executive resolution and not by the Constitution or an Act of Parliament, the high rank of its Deputy Chairman was a long-standing administrative convention in the Indian government structure until the body was replaced by NITI Aayog in 2015.

Explanation

In November 2012, on the sidelines of the ASEAN Summit in Phnom Penh, India and Japan signed a memorandum of understanding for the joint development and supply of rare earth minerals. This strategic agreement allowed Japan to import rare earth oxides from India, helping Tokyo diversify its procurement sources and reduce its significant dependence on China for these critical materials. Under the pact, Indian Rare Earths Limited (IREL) entered into an arrangement to supply mixed rare earth chloride to Japanese companies, such as Toyota Tsusho, for further processing into individual rare earth elements. These minerals are vital for Japan's high-tech manufacturing sector, including the production of hybrid car motors, wind turbines, and advanced electronics.

Explanation

Aung San Suu Kyi is a prominent politician, diplomat, and author from Myanmar, formerly known as Burma. She was born in Yangon and is the daughter of Bogyoke Aung San, the independence hero who is considered the Father of the Nation of modern Myanmar. She gained international fame as the leader of the National League for Democracy (NLD) and for her long-standing non-violent struggle to bring democratic governance to her country. For her efforts in advocating for human rights and democracy within Myanmar while under house arrest, she was awarded the Nobel Peace Prize in 1991.

Explanation

The DPT vaccine is a trivalent combination vaccine designed to provide immunity against three specific bacterial infections: diphtheria, pertussis, and tetanus. Diphtheria is caused by Corynebacterium diphtheriae and primarily affects the mucous membranes of the throat and nose. Pertussis, commonly known as whooping cough, is a highly contagious respiratory disease caused by the bacterium Bordetella pertussis. Tetanus is a serious condition caused by the toxin of Clostridium tetani, which enters the body through wounds and affects the nervous system, leading to severe muscle spasms. The vaccine typically consists of diphtheria and tetanus toxoids combined with either killed whole-cell or acellular components of the pertussis bacterium to stimulate the immune system to produce antibodies against all three pathogens simultaneously.

Explanation

Dr. Madhav Chavan was awarded the WISE Prize for Education in 2012 at the fourth World Innovation Summit for Education held in Doha, Qatar. As the co-founder and CEO of Pratham, an Indian non-governmental organization, he was recognized for his transformative work in improving literacy and the quality of education for millions of children across India. Under his leadership, Pratham developed low-cost, high-impact learning models and established the Annual Status of Education Report (ASER), which revolutionized how educational outcomes are measured and addressed in developing nations by using a citizen-led assessment approach.

Explanation

The price of a commodity is determined by its marginal utility rather than its total utility. This economic concept, known as the Paradox of Value, explains why life-sustaining essentials like water are cheap while luxury items like diamonds are expensive. Because water is abundant, the marginal utility—the satisfaction gained from consuming one additional unit—is very low, leading to a low market price. In contrast, diamonds are scarce, which ensures that the marginal utility of acquiring an additional unit remains exceptionally high. In accordance with the principle P = MU, where price (P) aligns with marginal utility (MU), consumers are willing to pay a higher price for diamonds because the utility of the marginal unit is far greater than that of the marginal unit of water.

Explanation

Rectified spirit is a highly concentrated ethanol solution that has been purified through the process of fractional distillation. It typically contains approximately 95% ethanol and 5% water by volume. This composition is significant because it represents the azeotropic mixture of ethanol and water, which has a lower boiling point than either pure ethanol or pure water. Because of this azeotropic property, simple distillation cannot remove the remaining 5% of water, making rectified spirit the highest concentration of ethanol achievable through standard distillation methods.

Explanation

Free Trade Centres, formally established as Free Trade and Warehousing Zones (FTWZs) under the Special Economic Zones Act of 2005, are specialized enclaves specifically designed to facilitate international trade through world-class warehousing and logistics infrastructure. These zones operate as deemed foreign territories for trade operations, meaning that goods can be imported into these centres without the payment of customs duties as long as they are stored or processed for re-export. This specific legal and fiscal framework, which provides exemptions from various taxes and duties to streamline the global supply chain, is a core component of the SEZ policy and is restricted to these designated zones to ensure controlled regulatory oversight of export-oriented activities and foreign exchange transactions.

Explanation

The Brazil Current is a warm water current that flows southward along the eastern coast of South America. Upon reaching the subtropical latitudes near 35° S to 40° S, it encounters the cold Falkland Current. Under the powerful influence of the prevailing Westerlies, the current is deflected toward the east, crossing the South Atlantic Ocean toward the African coast. This eastward-flowing segment of the South Atlantic subtropical gyre is formally known as the South Atlantic Drift. It serves as the southern limb of the gyre before it eventually turns northward to form the Benguela Current.

Explanation

Chanda Kochhar, the former Managing Director and Chief Executive Officer of ICICI Bank, was ranked as the most powerful woman in business in India by Fortune magazine in 2012. This was the second consecutive year she held the top position on the list. Fortune India recognized her leadership in managing Indias largest private sector bank and her significant influence on the countrys financial sector. The ranking considered various factors including the size and importance of the business in the global economy, the health and direction of the company, and the individual's career trajectory and social influence.

Explanation

Communication satellites function as active relay stations positioned in space, primarily in geostationary orbit. Their fundamental operation involves receiving radio frequency signals from an uplink earth station, amplifying or shifting the frequency of these signals using onboard transponders, and kemudian redirecting or retransmitting them back to a downlink station or a wider geographic area on Earth. By acting as a repeater, these satellites overcome the line-of-sight limitations caused by the Earth's curvature, allowing for long-distance telecommunications, television broadcasting, and data transmission across continents.

Explanation

The Dhammachakkapabattanasutta is the Pali name for the first discourse delivered by Gautama Buddha after he attained enlightenment under the Bodhi tree. He preached this sermon at the Deer Park in Isipatana, modern-day Sarnath, to the five ascetics who had previously been his companions. The term translates to Setting the Wheel of Dhamma in Motion, symbolizing the start of the dissemination of Buddhist teachings. In this sermon, the Buddha outlined the fundamental principles of Buddhism, including the Middle Way, the Four Noble Truths concerning the nature of suffering, and the Noble Eightfold Path as the means to achieve liberation. This event marks a pivotal moment in the history of Buddhism, establishing the foundation of the Buddhist Sangha and the formal teaching of the Dharma.

Explanation

The Toda people are a Dravidian ethnic group and an indigenous pastoral community residing in the Nilgiri Hills of Tamil Nadu. Their traditional territory is located on the high-altitude Nilgiri plateau within the Western Ghats. The Toda culture is famously centered around the sacred water buffalo, which forms the basis of their economy and religious rituals. They are well-known for their unique barrel-vaulted houses made of bamboo and thatch, as well as their distinct style of embroidery called Pukhoor. The Government of India has classified the Toda tribe as a Particularly Vulnerable Tribal Group (PVTG) due to their unique cultural heritage and localized population within the state.

Explanation

Masanobu Fukuoka was a Japanese farmer and philosopher who wrote the influential book The One-Straw Revolution, published in 1975. The book serves as a manifesto for natural farming, also known as do-nothing farming, which advocates for an agricultural system that minimizes human interference. Fukuoka proposed four main principles: no cultivation (plowing), no chemical fertilizers or prepared compost, no weeding by tillage or herbicides, and no dependence on chemicals. His philosophy emphasizes observing natural cycles and allowing the ecosystem to flourish with minimal disturbance, influencing the global organic farming and permaculture movements.

Explanation

Jayaprakash Narayan, a prominent leader of the Indian independence movement and a founding member of the Congress Socialist Party, wrote Why Socialism? in 1936. In this seminal work, he articulated the necessity of adopting socialist principles to address India's deep-rooted socio-economic issues such as poverty, landlessness, and exploitation. He argued that political freedom from British rule would be incomplete without a radical reorganization of society that ensured economic equality and social justice for the masses. The book served as an ideological manifesto for the socialist faction within the Indian National Congress, bridging the gap between nationalist aspirations and Marxist-Leninist thought adapted to the Indian context.

Explanation

Hypother terms a medical condition that occurs when the core body temperature drops below the required level for maintaining normal metabolism and body functions, typically defined as 35° C (95° F) in humans. Human beings are homeotherms, meaning they maintain a constant internal body temperature through metabolic heat production and physiological regulation. When exposed to extreme cold, if the body's heat loss through conduction, convection, and radiation exceeds its ability to generate heat, the internal temperature falls. This failure of thermoregulation leads to the clinical state of hypothermia, which affects the nervous system and organ function. Unlike cold-blooded organisms that naturally adjust their body temperature to match the environment, humans rely on a stable thermal state, making a sudden drop in temperature a pathological and life-threatening condition.

Explanation

Smallpox is an acute contagious disease caused by the Variola virus. Following a large-scale global vaccination campaign led by the World Health Organization (WHO), the 33rd World Health Assembly officially declared the world free of smallpox on May 8, 1980. It remains the first and only human infectious disease to be successfully eradicated worldwide. This achievement was possible because humans are the only reservoir for the virus, and the vaccine provided long-lasting immunity, effectively breaking the chain of transmission. The last naturally occurring case of Variola minor was diagnosed in Somalia in October 1977.

Explanation

Article 62(2) of the Constitution of India mandates that an election to fill a vacancy in the office of the President occurring by reason of death, resignation, removal, or otherwise must be held as soon as possible and in no case later than six months from the date of occurrence of the vacancy. During this intervening period, the Vice-President of India acts as the President to ensure the continuity of the constitutional office. This specific timeframe ensures that the highest constitutional post in the country does not remain vacant or held by an acting official for an extended duration.

Explanation

Non-Resident Indian (NRI) Day, also known as Pravasi Bharatiya Divas, is celebrated on January 9 to mark the contribution of the overseas Indian community towards the development of India. This specific date was chosen because it commemorates the return of Mahatma Gandhi, the greatest Pravasi, from South Africa to Mumbai on January 9, 1915. The event was established in 2003 and is sponsored by the Ministry of External Affairs to provide a platform for the overseas Indian community to engage with the government and people of the land of their ancestors.

Explanation

Blood is classified as a specialized fluid connective tissue because it originates from the mesoderm, which is the same embryonic germ layer that gives rise to all other connective tissues in the body. It consists of living cellular components, including erythrocytes, leukocytes, and platelets, which are suspended in a non-living liquid extracellular matrix called plasma. This tissue functions to integrate the body by circulating through the vascular system, effectively connecting different organs and systems by transporting oxygen, nutrients, hormones, and metabolic waste products. While it lacks the structural fibers found in most other connective tissues, it maintains the fundamental characteristics of providing a medium for transport and maintaining the internal environment.

Explanation

A limnic eruption, often referred to as a lake overturn, is a rare natural disaster in which dissolved carbon dioxide (CO₂) suddenly erupts from deep lake waters. This phenomenon occurs in meromictic lakes where the water layers remain stratified and do not mix for long periods. Over time, CO₂ from volcanic activity or the decomposition of organic matter accumulates and becomes supersaturated in the cold, high-pressure depths of the lake. If the water column is disturbed by a trigger such as a landslide, earthquake, or volcanic activity, the gas-saturated water rises toward the surface. As the pressure decreases, the CO₂ rapidly expands and escapes the water, forming a dense gas cloud that stays close to the ground and can suffocate humans and animals by displacing oxygen. The term originates from the Greek word limne, meaning lake. Notable occurrences of this disaster include the events at Lake Monoun in 1984 and Lake Nyos in 1986.

Explanation

In physics, elasticity is defined by the Young's modulus, which is the ratio of stress to strain. Since steel requires a significantly larger deforming force to produce the same amount of strain as rubber, it is considered the more elastic material.

Explanation

Progesterone is a steroid hormone naturally produced by the ovaries that plays a vital role in regulating the menstrual cycle and maintaining the early stages of pregnancy. In oral contraceptives, synthetic versions of progesterone, known as progestins, are used to prevent conception primarily by suppressing the secretion of Luteinizing Hormone (LH) from the anterior pituitary gland. This suppression inhibits ovulation, the process where an egg is released from the ovary. Additionally, progesterone thickens the cervical mucus, which creates a physical barrier that prevents sperm from reaching the uterus, and modifies the lining of the uterus to make it less receptive to the implantation of a fertilized egg. These combined actions make it a highly effective component of birth control formulations.

Explanation

Acid rain results from the chemical reaction of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) with water, oxygen, and other oxidants in the atmosphere. These compounds form sulfuric acid (H₂SO₄) and nitric acid (HNO₃), which then descend to the earth's surface in wet or dry forms. Since these pollutants can be transported over hundreds of kilometers by atmospheric circulation, the resulting environmental degradation often occurs far from the original source of emission, making it a classic example of transboundary pollution. Chemical reactions such as 2SO₂ + O₂ → 2SO₃ followed by SO₃ + H₂O → H₂SO₄ and 3NO₂ + H₂O → 2HNO₃ + NO illustrate the acidification process of rainwater.

Explanation

Oxalic acid (H₂C₂O₄) is highly effective for removing rust stains because it acts as a powerful chelating agent. Rust is primarily composed of hydrated iron(III) oxides, which are insoluble in water and adhere strongly to clothing fibers. When oxalic acid is applied to the stain, it reacts with the iron(III) ions to form a stable, water-soluble complex called the ferrioxalate ion, [Fe(C₂O₄)₃]³⁻. This chemical process transforms the insoluble reddish-brown iron oxide into a soluble salt that can be easily rinsed out with water. It is a standard component in many commercial rust removers due to its specific reactivity with iron compounds.

Explanation

Madan Mohan Malaviya played a pivotal role in the acquisition and growth of The Hindustan Times during its early years in the 1920s. To finance the purchase and operation of the newspaper from its original Akali founders, Malaviya secured a loan of five lakh rupees from the Punjab National Bank. This financial backing, obtained with the assistance of other prominent figures such as Lala Lajpat Rai and G.D. Birla, enabled the newspaper to establish itself as a significant voice in the Indian nationalist movement.

Explanation

Endemic species are plants or animals that are found exclusively in a particular geographic area and are not naturally found anywhere else in the world. Several species within the hornbill family serve as classic examples of endemism in the Indian subcontinent. For instance, the Narcondam Hornbill is restricted entirely to the Narcondam Island in the Andaman and Nicobar Islands. Similarly, the Malabar Grey Hornbill is endemic to the Western Ghats of India. These birds have evolved in isolation within specific habitats, such as tropical evergreen forests or isolated islands, making their distribution strictly localized to those unique environments.

Explanation

Karl Landsteiner, an Austrian biologist and physician, discovered the ABO blood group system in 1900. He observed that when blood from different individuals was mixed, it often resulted in the clumping or agglutination of red blood cells, which he determined was due to an immune response. This discovery led to the identification of the three primary blood groups: A, B, and O. His work revolutionized medicine by making blood transfusions a safe and routine medical procedure, as it allowed doctors to match donor and recipient blood types to prevent fatal reactions. For this pioneering research, Landsteiner was awarded the Nobel Prize in Physiology or Medicine in 1930.

Explanation

Barack Obama spoke these words during his victory speech in Chicago on the night of November 6, 2012, after being re-elected for a second term as the President of the United States. In his address to the American public, he emphasized the importance of unity and acknowledged that the diverse experiences and feedback from citizens across the country, including those who did not vote for him, had profoundly shaped his leadership and personal growth during his first term in office. The speech aimed to bridge political divides and reaffirm his commitment to serving all Americans as the nation moved forward.

Explanation

The principle of maximum social advantage, formulated by British economist Hugh Dalton, is the foundational principle of public finance, also known as fiscal economics. It suggests that the state should collect revenue and perform expenditure in such a way as to maximize the total social welfare of the community. According to this principle, the government should balance the marginal social sacrifice (MSS) incurred by taxpayers through taxation with the marginal social benefit (MSB) gained by the public through government spending. The optimum limit of state financial activity is reached at the point where the marginal social benefit of the last unit of money spent equals the marginal social sacrifice of the last unit of money raised in taxes, represented as MSB = MSS. This ensures that every fiscal action taken by the government contributes to the highest possible net social gain.

Explanation

The Fourth Five Year Plan was delayed due to the economic instability following the Indo-Pakistan War of 1965, successive years of severe drought, and the devaluation of the Indian Rupee. Consequently, the period from 1966 to 1969 was designated as a Plan Holiday, during which three Annual Plans were implemented instead of a comprehensive five year plan. The Fourth Five Year Plan was subsequently launched in 1969 and continued until 1974, making the 1966-1971 timeframe an inaccurate representation of its duration.

Explanation

The decibel (dB) is the unit used to measure the intensity or loudness of sound. For human beings, the ordinary sound level associated with normal conversation is approximately 60 dB. As sound intensity increases, the human ear can tolerate higher levels without immediate pain, but 80 dB is generally considered the maximum tolerance limit for prolonged exposure. Sounds exceeding this 80 dB threshold are categorized as noise pollution and can lead to hearing damage, psychological stress, and other health issues over time. Therefore, the range from 60 dB to 80 dB captures the transition from a standard, comfortable hearing environment to the upper limit of safe human endurance.