SSC CHSL Tier 1 2012 General Awareness Questions with Solutions

Explanation

Waterproof materials are treated with hydrophobic substances that prevent water from wetting the fabric. The high surface tension of water causes the falling rain droplets to form cohesive, spherical beads instead of spreading and soaking into the material. Because of surface tension, a certain pressure threshold is required to force water through the tiny pores of the woven fabric. Since this necessary pressure is much higher than the natural pressure exerted by falling rain, water remains on the outer surface and rolls off, making the material waterproof.

Explanation

Icons in a graphical user interface are small visual images or symbols representing a program, file, folder, or function. They function as picture commands because users can click or tap them to execute a specific task or open an application without needing to type text-based instructions.

Explanation

In MS-DOS, external commands are separate executable files stored on a storage disk rather than being embedded directly within the primary command interpreter, command.com. Because these commands are not loaded into the system memory at startup, the operating system must locate and load the specific executable file from the disk into the RAM whenever the command is called. FORMAT is a classic example of an MS-DOS external command, represented by the program file FORMAT.COM. This utility performs disk-intensive operations such as creating a new file system, initializing directory structures, and scanning the storage media for bad sectors, which requires a dedicated, specialized executable file to manage the disk formatting process.

Explanation

Ribulose-1,5-bisphosphate carboxylase-oxygenase, commonly known as Rubisco, is the most abundant enzyme and protein in the biosphere. It plays a critical role in photosynthesis by catalyzing the primary step of carbon fixation, where atmospheric carbon dioxide is converted into energy-rich organic molecules. Because the enzyme has a relatively slow catalytic rate, photosynthetic organisms, including all green plants, algae, and cyanobacteria, must produce it in immense quantities to maintain efficient photosynthetic rates. Consequently, Rubisco constitutes up to 30% to 50% of the soluble protein found in plant leaves, leading to its status as the most abundant enzyme in the living world.

Explanation

The electromagnetic spectrum is arranged in order of decreasing frequency and increasing wavelength as follows: Gamma-rays, X-rays, Ultraviolet rays, Visible light, Infrared rays, Microwaves, and Radio waves. Within this sequence, the X-ray region, with wavelengths typically ranging from 0.01 to 10 nanometers, lies directly between Gamma-rays and the Ultraviolet region.

Explanation

The twinkling of a star is caused by the atmospheric refraction of starlight. As starlight passes through the Earth's atmosphere, it encounters layers of air with varying densities and temperatures, meaning the refractive index of the medium is constantly changing. This causes the light rays to bend dynamically, making the apparent position and brightness of the star fluctuate continuously. This rapid shifting in light intensity is perceived as twinkling.

Explanation

Ethyne (C₂H₂) contains sp-hybridized carbon atoms, which have 50% s-character. Because s-orbitals are closer to the nucleus than p-orbitals, an sp-hybridized carbon is highly electronegative. This high electronegativity strongly pulls the shared pair of electrons in the C-H bond toward the carbon atom, making the hydrogen atom highly protonic. When ethyne is treated with ammoniacal silver nitrate, these acidic hydrogen atoms are replaced by silver ions (Ag⁺) to form a white precipitate of silver acetylide (Ag₂C₂). This reaction directly showcases the acidic property of ethyne, as it behaves as a weak acid by donating protons to the medium.

Explanation

Transportation is the largest anthropogenic source of carbon monoxide (CO) emissions globally. It is produced by the incomplete combustion of carbon-based fossil fuels, such as gasoline and diesel, in the internal combustion engines of automobiles, trucks, and other mobile sources. When engines operate under inefficient conditions, such as during cold starts, idling, or in heavy traffic, the available oxygen is insufficient to completely oxidize carbon to carbon dioxide (CO₂), resulting in the elevated release of carbon monoxide.

Explanation

An aerosol is defined as a suspension of fine solid particles or liquid droplets in a gaseous medium such as air. These microscopic particles, often referred to as particulate matter, remain suspended in the atmosphere for extended periods due to their extremely small size and low settling velocity. Common examples include dust, smoke, soot, and volcanic ash, which exist as solid particles dispersed throughout the air.

Explanation

In computer architecture and assembly programming, an effective memory address is computed using various components to locate data dynamically and flexibly. An address specification can consist of a base register, which holds the starting memory address of a program segment or data structure; an index register, which stores a dynamic offset value used to step through array elements; and an offset (or displacement), which is a constant value representing the direct distance within the memory segment.

The effective address is calculated as: Effective Address = Base Register + Index Register + Offset

Because a memory address can incorporate any or all of these elements depending on the addressing mode, they are all valid components of an address.

Explanation

Philosopher's wool is the historical term for zinc oxide (ZnO). Early alchemists prepared zinc oxide by burning metallic zinc in the presence of air, which produced a white, woolly, and fluffy residue resembling wool fibers. This substance was also known as lana philosophica or zinc white and has historically been used in various ointments, cosmetics, and pigments.

Explanation

Synthetic detergents are formulated cleaning agents that have the cleansing properties of soap but do not contain any carboxylate soap groups. These are primarily the sodium salts of long-chain alkyl benzene sulphonic acids, such as sodium p-dodecylbenzene sulphonate. They are synthesized by reacting hydrocarbons, specifically alkylbenzenes obtained from petroleum, with concentrated sulphuric acid to form alkylbenzene sulphonic acids, which are subsequently neutralized with sodium hydroxide to form their corresponding sodium salts. Unlike traditional soaps, their calcium and magnesium salts are highly soluble in water, enabling them to remain highly effective cleansing agents even in hard water.

Explanation

Prior to Dr. Manmohan Singh's state visit to Myanmar in May 2012, the last visit by an Indian Prime Minister to that country was made by Rajiv Gandhi in December 1987. This 1987 visit established a foundation for modern bilateral relations, and Dr. Manmohan Singh's subsequent trip in 2012 marked the first visit by an Indian Prime Minister to Myanmar in 25 years.

Explanation

V.S. Sampath served as the 18th Chief Election Commissioner of India. He assumed office on June 11, 2012, succeeding S.Y. Quraishi, and held the position until January 15, 2015. He was the serving Chief Election Commissioner of India in November 2012.

Explanation

Andhra Pradesh has never had a female Chief Minister since its inception. The state's executive leadership has exclusively been headed by male Chief Ministers throughout its entire political history.

Explanation

The International Criminal Police Organization, commonly known as INTERPOL, has its general secretariat and global headquarters located in Lyons, France. The headquarters was officially moved to Lyons in 1989 from its previous location in Saint-Cloud to accommodate its expanding administrative and operational needs as the world's largest international police organization.

Explanation

Sanitary waste consists of liquid waste and human excreta, including urine and fecal matter, discharged from water closets and urinals. Because it contains highly infectious pathogens, this waste stream requires specialized conveyance through soil pipes to sewer networks for treatment and safe disposal.

Explanation

According to the drinking water specifications set by the Bureau of Indian Standards under IS 10500, the acceptable or desirable limit of total hardness in drinking water is 200 mg/L, expressed as CaCO₃ equivalent. This threshold is designated to prevent scaling in domestic plumbing systems, water heaters, and pipelines, while also avoiding excessive soap consumption during washing. Hardness levels within this concentration maintain a balance between acceptable taste, health-essential mineral content, and municipal infrastructure protection.

Explanation

Mycobacterium leprae is a rod-shaped, acid-fast bacterium that causes leprosy, also known as Hansen's disease. In microbiological classification, bacteria that possess a rod-like morphology are categorized as bacilli. Under microscopic examination, Mycobacterium leprae appears as straight or slightly curved rods, frequently grouping together in parallel bundles or dense clumps resembling packets of cigarettes due to its lipid-rich cell wall.

Explanation

Rajasthan is the largest state in India by area, covering approximately 342,239 square kilometers. This constitutes about 10.4% of the total geographical area of the country. Located in the northwestern region of India, it contains the major portion of the Thar Desert. Rajasthan became the largest state in India on November 1, 2000, following the bifurcation of Madhya Pradesh to create the state of Chhattisgarh.

Explanation

Dr. C. Rangarajan served as the Chairman of the Economic Advisory Council to the Prime Minister (PMEAC) under Prime Minister Dr. Manmohan Singh. He held this cabinet-ranked position from August 2009 until May 2014, when the government changed. He also previously chaired the council from 2005 to 2008 during the first United Progressive Alliance administration.

Explanation

South Sudan was admitted as the 193rd member State of the United Nations on July 14, 2011. This admission followed a referendum held in January 2011, in which the citizens of South Sudan voted overwhelmingly to secede and form an independent nation. The United Nations General Assembly formally admitted the country by acclamation through Resolution 65/308, establishing it as the newest sovereign country to join the international organization.

Explanation

The Rajiv Gandhi Khel Ratna Award, India's highest sporting honour (now known as the Major Dhyan Chand Khel Ratna Award), was instituted in the year 1991–92 to recognize spectacular and outstanding performance in the field of sports. Up to April 2012, only two cricket players had received this prestigious award.

The first cricketer to be conferred with the Rajiv Gandhi Khel Ratna Award was Sachin Tendulkar in the year 1997–98 for his phenomenal batting performances and contributions to Indian cricket.

The second cricketer to receive this honor was Mahendra Singh Dhoni in the year 2007–08, primarily in recognition of his leadership in guiding India to victory in the inaugural ICC World Twenty20 in 2007.

Explanation

The four Grand Slam tournaments, also referred to as the majors, follow a fixed chronological order throughout the calendar year based on their scheduled dates. The Australian Open kicks off the tennis season in mid-to-late January. This is followed by the French Open, which begins in late May. Next is Wimbledon, scheduled from late June to early July. Finally, the US Open concludes the Grand Slam calendar, starting in late August.

Explanation

The Jantar Mantar located in Delhi is not designated as a UNESCO World Heritage Site. While Maharaja Sawai Jai Singh II of Jaipur constructed five astronomical observatories across Northern India (in Delhi, Jaipur, Ujjain, Varanasi, and Mathura), only the Jantar Mantar in Jaipur was inscribed on the UNESCO World Heritage List in 2010. The Delhi observatory, which was constructed in 1724, is maintained as a protected monument by the Archaeological Survey of India but does not hold World Heritage status.

Explanation

Joint demand refers to the demand for two or more goods that are used together to satisfy a single want or need. Complementary goods, such as a pen and ink or a car and petrol, must be consumed in combination with each other to yield utility. Because the demand for one of these goods directly leads to a simultaneous demand for the other, their combined demand is classified as joint demand.

Explanation

Jean-Jacques Rousseau, the influential 18th-century philosopher, advocated for a return to a natural state of existence, which is often summarized by the call "Go back to nature". In his major works, including Emile and The Social Contract, Rousseau argued that humans are inherently good and free by nature but become corrupted by the artificial constructs, social inequalities, and institutions of civilized society. To preserve human goodness and freedom, he proposed an educational philosophy and lifestyle that align closely with natural instincts, encouraging individuals to live in harmony with the natural world rather than being constrained by the corrupting influences of modern civilization.

Explanation

The Indian Constitution does not provide for a presidential form of government. Instead, it establishes a parliamentary system of government both at the Centre and in the States. In a presidential system, the executive is constitutionally independent of the legislature and the President is both the head of state and the head of government with real executive powers. Under the Indian Constitution, the executive is responsible to the legislature, and the President is only the nominal or ceremonial head of state (de jure executive), while the Prime Minister leads the real executive (de facto executive).

Explanation

Producers' goods, also known as capital goods, are tangible assets used by businesses in the production process to manufacture other goods or services. Plant and machinery serve as essential tools and equipment that facilitate the creation of finished products rather than being consumed directly by end consumers. They are classified as producers' goods because their utility lies in generating future economic output and assisting in the manufacturing cycle.

Explanation

Social status is not a dimension of the Human Development Index. The Human Development Index, established by the United Nations Development Programme, is a statistical composite index designed to measure average achievements in three basic aspects of human development: health, education, and income. Social status, which relates to social hierarchy, prestige, or class, is a qualitative and highly variable social construct that is not included in the quantitative calculation of this global index.

Explanation

Loans represent borrowings by the Union Government. Under the structure of the government budget, receipts are classified into revenue receipts (current revenue) and capital receipts. Current revenue consists of receipts that do not create any future liability or lead to a reduction in government assets. Because loans create a financial liability for the government and must be repaid in the future, they are classified as capital receipts under the Capital Account rather than current revenue.

Explanation

Under the Constitution of India, both the Supreme Court and the High Courts possess the power to issue writs to protect constitutional and legal rights. The Supreme Court has this power under Article 32, which is a fundamental right itself, specifically for the enforcement of Fundamental Rights. High Courts are vested with broader writ jurisdiction under Article 226, enabling them to issue writs not only for the enforcement of Fundamental Rights but also for any other legal purpose. These writs include Habeas Corpus, Mandamus, Certiorari, Prohibition, and Quo Warranto.

Explanation

The Yajur Veda is the Veda of prose mantras and sacrificial formulas. The name is derived from the Sanskrit word Yajus, which translates to sacrificial prayer or formula. It serves as a practical guidebook for the Adhvaryu priests who perform the physical rituals and manual rites of the sacrifices. The text contains the precise prose formulas, rituals, and chants to be uttered while offering oblations into the sacred fire during various Vedic ceremonies.

Explanation

The Gandhara school of art flourished and produced its finest sculptures during the Kushan period, particularly under the patronage of the Kushan emperors like Kanishka in the first to third centuries AD. This style of art was heavily influenced by Greco-Roman techniques, blending them with Indian Buddhist iconography. The sculptures from this era, crafted primarily in blue-grey schist and later in stucco, are celebrated for their highly realistic physical details, detailed drapery, and expressive portrayal of the Buddha and Bodhisattvas.

Explanation

The Panchayati Raj system in India is based on the principle of democratic decentralisation. It aims to devolve administrative and financial powers, authority, and responsibility to the grassroots level of administration, allowing local communities at the village, block, and district levels to participate directly in their own governance and development. This framework of local self-government was formally constitutionalised through the 73rd Constitutional Amendment Act of 1992, which established a three-tier system of Panchayats to ensure effective public participation in decision-making.

Explanation

Under Article 118(4) of the Constitution of India, the Speaker of the Lok Sabha presides over a joint sitting of both Houses of Parliament. The President of India summons the joint session under Article 108 to resolve a deadlock between the Lok Sabha and the Rajya Sabha over the passage of a bill, but the responsibility of chairing and conducting the proceedings of this session rests with the Speaker of the Lok Sabha.

Explanation

According to Article 110(3) of the Constitution of India, if any question arises whether a Bill is a Money Bill or not, the decision of the Speaker of the Lok Sabha is final. Under Article 110(4), when a Money Bill is transmitted to the Rajya Sabha and when it is presented to the President for assent, it must carry an endorsement certificate signed by the Speaker of the Lok Sabha certifying that it is a Money Bill.

Explanation

Indira Point is the southernmost point of India, located on Great Nicobar Island in the Andaman and Nicobar Islands territory. It lies at approximately 6° 45′ N latitude. Formerly known as Pygmalion Point, it was renamed in honour of the former Prime Minister Indira Gandhi in the mid-1980s. This point is situated significantly further south than the mainland territory of India.

Explanation

The Suez Strait (commonly referred to as the Suez Canal) is a vital waterway located in Egypt that connects the Mediterranean Sea to the Red Sea. This sea-level channel provides a direct maritime route for vessels travelling between Europe and Asia, bypassing the lengthy and hazardous journey around the southern tip of Africa. Officially opened in November 1869, it plays a critical role in facilitating international trade by significantly shortening shipping times and reducing transit distances.

Explanation

The Western Coastal Plain of India is a narrow plain situated between the Western Ghats and the Arabian Sea. The northern section of this western coastline is called the Konkan coast. It extends from the Daman area in the north, running southwards along the coasts of Maharashtra and Goa, until it meets the Kanara coast in Karnataka. This rugged coastal stretch is characterized by pocket beaches, cliffs, creeks, and numerous seasonal rivers flowing rapidly from the Western Ghats to the Arabian Sea.

Explanation

The laughing kookaburra, native to Australia, is the largest member of the kingfisher family. It is widely known as the Laughing Jack or Laughing Jackass due to its distinctive, loud, and raucous call that closely resembles human laughter. This iconic vocalization is primarily used to establish and defend territorial boundaries within family groups.

Explanation

Dara Shikoh, the eldest son of the Mughal Emperor Shah Jahan, was a scholar who advocated for religious harmony and the synthesis of Hindu and Islamic mystical traditions. In his pursuit of spiritual knowledge, he learned Sanskrit and undertook the translation of several classical Hindu texts into Persian. He translated the Bhagavad Gita into Persian and also translated fifty Upanishads under the title Sirr-i-Akbar, with the assistance of Sanskrit pandits from Varanasi.

Explanation

Afonso de Albuquerque, who served as the Governor of Portuguese India from 1509 to 1515, conquered Goa in 1510. Following his acquisition of the territory, he introduced several administrative and social reforms, one of the most prominent being the abolition of Sati (the practice of self-immolation by widows) within the territories under Portuguese control. This progressive measure made him the first administrator in India to officially ban the practice, centuries before it was outlawed in British India.

Explanation

Mitochondria are the primary sites of aerobic respiration in eukaryotic cells, where the Krebs cycle and oxidative phosphorylation take place to generate ATP in the presence of oxygen. Mature red blood cells lack mitochondria, which prevents them from performing aerobic respiration. Consequently, they generate energy solely through anaerobic respiration via glycolysis, ensuring that they do not consume the oxygen they transport to other tissues of the body.

Explanation

A test cross is used to determine the zygosity of an individual exhibiting a dominant trait by crossing it with a homozygous recessive individual. When a heterozygous dominant plant (such as Tt) is crossed with a homozygous recessive plant (such as tt), the offspring will exhibit a phenotypic ratio of 1:1, consisting of half heterozygous dominant and half homozygous recessive individuals. This specific genetic cross directly identifies the heterozygous nature of the parent.

Explanation

DNA (deoxyribonucleic acid) is a polymer made of repeating units called nucleotides. Each nucleotide is composed of a nitrogenous base, a phosphate group, and a five-carbon sugar, which is classified as a pentose sugar. In DNA, this specific pentose sugar is 2-deoxyribose. It forms covalent bonds with the phosphate groups to create the sturdy sugar-phosphate backbone of the DNA double helix.

Explanation

The Earth's surface and the uppermost layer of the continental crust are predominantly covered by sedimentary rocks, which blanket about 75% of the land area. Because sedimentary rocks are formed near the surface through the accumulation, compaction, and cementation of mineral and organic particles, they are highly exposed to atmospheric agents. Continuous weathering, erosion, and disintegration of these surficial sedimentary rocks by wind, water, and temperature changes break them down readily, providing the vast majority of loose mineral particles and debris that serve as the primary parent material for the formation of the upper soil.

Explanation

The term gene was coined in 1909 by the Danish botanist, physiologist, and geneticist Wilhelm Johannsen. He introduced the term to describe the fundamental physical and functional unit of heredity, derived from the Greek word gonos, meaning birth or origin. Along with the term gene, Johannsen also introduced the terms genotype and phenotype to distinguish between the genetic constitution of an organism and its observable characteristics.

Explanation

Saprophytes are heterotrophic organisms, primarily fungi and bacteria, that obtain their nutrients from dead and decaying organic matter. They secrete digestive enzymes externally onto the decomposing material to break down complex organic compounds into simpler soluble substances, which they then absorb through their cell walls. This extracellular digestion process plays a crucial role in ecosystems by recycling essential nutrients back into the soil.

Explanation

Adam Smith popularized and systematically analyzed the concept of the division of labour in his landmark 1776 book, The Wealth of Nations. He illustrated this economic principle using the famous example of a pin factory, demonstrating that breaking down the production process into specialized, repetitive tasks significantly boosts productivity, improves manual dexterity, and saves time. This concept became a foundational pillar of classical economics and modern industrial organization.