SSC CHSL Tier 1 2010 General Awareness Questions with Solutions

Explanation

Amoeba is a unicellular eukaryotic organism belonging to the kingdom Protista. Because its entire body consists of only a single cell, it lacks specialized multicellular structures, tissues, and organ systems, including a nervous system. It relies entirely on simple intracellular mechanisms, such as cytoplasmic streaming and cell membrane receptors, to sense, interact with, and respond to environmental stimuli.

Explanation

Malaria is caused by single-celled eukaryotic microorganisms belonging to the genus Plasmodium, which are classified as protozoa. The disease is transmitted to humans through the bite of an infected female Anopheles mosquito, which acts as a vector. Once the Plasmodium protozoan enters the human bloodstream, it travels to the liver to mature and reproduce, subsequently infecting and destroying red blood cells. This lifecycle of the protozoan parasite within the host leads to the characteristic clinical symptoms of malaria, such as high fever, shaking chills, and flu-like illness.

Explanation

Gout is a common and complex form of inflammatory arthritis characterized by sudden, severe attacks of pain, swelling, redness, and tenderness in the joints. It is caused by hyperuricemia, which is an excess of uric acid in the blood. Under this condition, uric acid can form sharp, needle-like monosodium urate crystals that accumulate and deposit in the joint spaces. The presence of these crystals triggers a localized inflammatory reaction by the immune system, resulting in the painful joint inflammation characteristic of gouty arthritis.

Explanation

Mitochondria are considered prokaryotic cells within eukaryotic cells according to the endosymbiotic theory. This theory suggests that mitochondria originated as free-living prokaryotic organisms, specifically aerobic bacteria, that were engulfed by ancestral anaerobic eukaryotic cells in a symbiotic relationship. Over evolutionary time, they became integrated into the host cell but retained several distinct prokaryotic features. These include possessing their own circular double-stranded DNA molecule without histones, containing 70S ribosomes (similar to those found in bacteria rather than the 80S ribosomes in eukaryotic cytoplasm), and replicating independently within the cell through a process akin to binary fission.

Explanation

Proteins are nitrogenous organic compounds made up of amino acids. Every amino acid contains a central carbon atom bonded to an amino group, which contains nitrogen, a carboxyl group, and a specific side chain. Because nitrogen is a defining element of amino acids, proteins are uniquely classified as nitrogenous foods essential for cellular growth, tissue repair, and the production of enzymes.

Explanation

An exponential growth in human population is the fundamental driver of forest cover loss. As the population increases, there is a corresponding surge in the global demand for food, housing, energy, and raw materials. To meet these basic requirements, vast areas of natural forests are permanently cleared for cultivation, infrastructure, and settlement. The increasing population pressure leads to the overexploitation of natural ecosystems and the rapid conversion of forest land into human-dominated landscapes, making population growth the root anthropogenic cause of deforestation.

Explanation

The greenhouse effect is a natural process where certain gases in the Earth's atmosphere trap heat, preventing it from escaping back into space. Incoming short-wave solar radiation easily passes through the atmosphere to warm the Earth's surface. In turn, the warmed surface emits long-wave infrared radiation back towards space. Carbon dioxide (CO₂) and other greenhouse gases absorb this outgoing infrared radiation and re-emit it in all directions, including back down towards the Earth's surface, which raises the overall temperature of the planet.

Explanation

The kidney is the primary organ of the human excretory system responsible for filtering blood and maintaining metabolic homeostasis. It excretes excess water to regulate the body's fluid and electrolyte balance, which is expelled from the body as urine. In terms of catabolic wastes, the kidneys filter out toxic nitrogenous products of protein and nucleic acid breakdown, including urea, uric acid, and creatinine. Furthermore, the kidney excretes products of fat metabolism, such as ketone bodies like acetoacetic acid and beta-hydroxybutyric acid, which are produced during the oxidation of fatty acids and are cleared from the blood during states of fasting, ketosis, or metabolic disorders. Through these filtration, secretion, and reabsorption processes in the nephrons, the kidneys efficiently remove water, fat metabolites, and various catabolic wastes from the bloodstream.

Explanation

Lead is released from motor car exhausts due to the combustion of petrol containing the antiknock additive tetraethyl lead, Pb(C₂H₅)₄. Lead is a highly toxic heavy metal and a potent neurotoxin that easily crosses the blood-brain barrier. Once inside the body, it accumulates in the brain and interferes with synaptic transmission, neurotransmitter release, and cell signaling pathways. This damages the central nervous system, leading to severe cognitive impairments, brain damage, learning disabilities, memory loss, and mental disorders, especially in children whose nervous systems are still developing.

Explanation

Mongla Port, which is misspelled as Mongolia Port in the question, is the second busiest seaport in Bangladesh. Mongolia itself is a landlocked nation and has no marine ports.

Explanation

The Navodaya Vidyalaya system was established in 1985 to identify and nurture talented children, predominantly from rural areas in India. Originally named Navodaya Vidyalayas, they were later renamed as Jawahar Navodaya Vidyalayas in the birth-centenary year of India's first Prime Minister, Pandit Jawaharlal Nehru, in honor of his legacy and contributions to education.

Explanation

For an electron revolving around the nucleus in an atom, the total energy E is the sum of its kinetic energy K and electrostatic potential energy U. The potential energy of the electron-nucleus system is negative due to the attractive force between the positive nucleus and the negative electron, expressed as U = -Z e² / (4 π ε₀ r). The kinetic energy of the revolving electron is always positive and is given by K = Z e² / (8 π ε₀ r). Adding these two gives the total energy E = K + U = -Z e² / (8 π ε₀ r), which means E = -K. Since kinetic energy is always positive, the total energy of a bound revolving electron is always negative. If the total energy were positive or zero, the electron would have enough energy to overcome the attractive electrostatic pull of the nucleus and escape the atom to become a free particle, rather than remaining in a bound revolving state.

Explanation

The mobility of charge carriers in a semiconductor is given by the relation:

μ = qτ / m*

where q represents the charge of the carrier, τ is the average relaxation time (the mean free time between successive collisions), and m* is the effective mass of the carrier.

Electrons in the conduction band are at a higher energy level and are further from the nucleus, experiencing weaker electrostatic forces from the atomic cores. Consequently, they move relatively freely through the crystal lattice with minimal disturbance, meaning they experience collisions less frequently. This results in a larger mean free time τ.

On the other hand, the movement of holes in the valence band requires the sequential breaking and reforming of covalent bonds as valence electrons hop from one atom to another. Because valence electrons are closely bound to the atomic nuclei, their movement is subject to strong interactions with the lattice ions, leading to highly frequent collisions and a much smaller relaxation time τ. Since mobility is directly proportional to the relaxation time, conduction band electrons possess higher mobility than holes due to this lower collision frequency.

Explanation

The mass number (A) of a nucleus is the total number of protons and neutrons, defined by the formula A = Z + N, where Z is the atomic number (number of protons) and N is the number of neutrons.

For the most common isotope of hydrogen, protium (¹H₁), the nucleus consists of a single proton and no neutrons (N = 0). Thus, its mass number is equal to its atomic number (A = Z = 1).

For all other nuclei, one or more neutrons are present in the nucleus (N ≥ 1), which makes the mass number greater than the atomic number (A > Z). Consequently, the mass number is sometimes equal to and sometimes more than the atomic number.

Explanation

The angle of deviation (δ) of light passing through a prism is given by the formula: δ = (μ - 1)A

where μ is the refractive index of the prism material and A is the angle of the prism.

According to Cauchy's dispersion formula, the refractive index of a medium is inversely proportional to the wavelength (λ) of light: μ ≈ P + Q/λ²

where P and Q are constants for the material.

Violet light has the shortest wavelength in the visible spectrum. Because of this short wavelength, the prism material offers the highest refractive index to violet light. According to the deviation formula, a higher refractive index directly results in a larger angle of deviation, causing violet light to bend the most when passing through the prism.

Explanation

Soft iron is the most suitable material for the core of a transformer because it possesses high magnetic permeability, low retentivity, and low coercivity. High magnetic permeability allows the magnetic flux to pass through the core easily, ensuring efficient magnetic coupling between the primary and secondary windings. Meanwhile, low retentivity and low coercivity ensure that the material can be magnetized and demagnetized rapidly with minimal energy loss. This minimizes hysteresis loss, which is the loss of energy as heat during the alternating cycles of magnetization and demagnetization in a transformer.

Explanation

Sublimation is the physical process where a substance transitions directly from a solid to a gas phase without passing through a liquid state. Iodine is a sublimable solid that easily vaporizes into violet fumes when heated. In contrast, potassium chloride is a non-sublimable ionic salt with a very high melting point. Heating the mixture causes the iodine to sublime into vapor, which can then be collected and re-solidified on a cold surface, leaving the potassium chloride behind in the heating vessel.

Explanation

Gold is a noble metal that is chemically highly inactive and does not react with biological fluids or tissues. Because of its extreme resistance to corrosion and chemical attack, it is biologically inert, meaning it does not break down or release toxic ions in the human body. This non-toxic nature makes it safe for use in various medical applications, dental fillings, and even as a decorative food additive.

Explanation

Methane (CH₄) is a highly flammable gas that is naturally trapped within coal beds during the geological process of coal formation. When mining operations break the coal seams, this trapped gas is released into the underground mine shafts. When methane mixes with the oxygen in the air in concentrations between 5% and 15% by volume, it forms a highly explosive mixture. In this concentration range, any minor ignition source such as an electrical spark, friction from mining equipment, or an open flame can easily trigger a violent explosion.

Explanation

The chemical behavior of an atom is determined by the configuration of the electrons orbiting around its nucleus, particularly the valence electrons in its outermost shell. Chemical reactions involve the sharing, gaining, or losing of these orbiting electrons to achieve a stable electronic configuration. Consequently, the arrangement and number of these electrons govern how an atom interacts and bonds with other atoms, thereby dictating its chemical properties and reactivity.

Explanation

Peroxyacetyl nitrate (PAN) is a secondary pollutant found in photochemical smog. It is generated through photochemical reactions involving volatile organic compounds (VOCs) and nitrogen oxides (NOₓ) under the influence of sunlight. PAN is highly unstable and acts as a potent lachrymatory agent, which means it directly stimulates the sensory nerves in the eyes, causing severe irritation, redness, and tearing even at extremely low concentrations.

Explanation

M.K. Narayanan, a retired Indian Police Service officer and former National Security Adviser of India, assumed office as the 19th Governor of West Bengal on 24 January 2010 and served in this position until 30 June 2014.

Explanation

Dr. S. Radhakrishnan was honoured with the Bharat Ratna in 1954, which was the inaugural year of the award. He served as the first Vice President of India from 1952 to 1962, and subsequently became the second President of India, serving from 13 May 1962 to 13 May 1967. He received the highest civilian award of India eight years prior to assuming the office of the President.

Explanation

Under Article 80(1)(a) of the Constitution of India, the President has the power to nominate 12 members to the Rajya Sabha (the Council of States). These nominations are made from among persons having special knowledge or practical experience in fields such as literature, science, art, and social service, as detailed under Article 80(3). This provision ensures that eminent personalities from diverse fields can contribute their expertise to the legislative process without undergoing the formal election process.

Explanation

Goa became the frontrunner by introducing Bharat Stage (BS) III compliant petrol and diesel across the entire state in early 2010, ahead of the nationwide implementation deadline of April 1, 2010. Major metropolitan areas like Delhi were transitioning to the stricter BS IV norms during this same period.

Explanation

Blue baby syndrome, also known as infant methemoglobinemia, is caused by the consumption of water or food contaminated with high levels of nitrates. Nitrates are converted into nitrites in the body, which bind to hemoglobin and decrease the blood's ability to carry oxygen.

Explanation

Nirupama Rao served as India's 28th Foreign Secretary from August 1, 2009 to July 31, 2011. In July 2010, she accompanied the External Affairs Minister S. M. Krishna to Islamabad, Pakistan, to participate in the high-level bilateral talks aimed at reducing the trust deficit and improving relations between the two nations.

Explanation

Mumbai won the 2009–10 Ranji Trophy Cricket Championship, which concluded in January 2010. In a closely contested final match played at the Gangothri Glades Cricket Ground in Mysore, Mumbai defeated Karnataka by 6 runs to clinch their 39th Ranji Trophy title.

Explanation

According to the 2011 Census of India, the Bhils constitute the largest tribal community in the country. Their total population stands at approximately 16.9 million, making up nearly 37.7% of India's total Scheduled Tribe population. The Bhils are indigenous to western and central India, with major concentrations residing in the states of Madhya Pradesh, Gujarat, Rajasthan, and Maharashtra. Historically renowned as excellent archers, the community is known for its rich cultural heritage, traditional music, and distinctive folk art styles.

Explanation

A horizontal demand curve indicates that buyers are willing to buy any quantity of a product at a given price, but demand drops to zero with even a slight increase in price. This represents a case of perfectly elastic demand, where the price elasticity of demand is infinite.

Explanation

Edward Chamberlin, an American economist, formulated the theory of monopolistic competition in his pioneering work, The Theory of Monopolistic Competition, which was published in 1933. He developed this theory at Harvard University, introducing a market structure that combines elements of both monopoly and perfect competition, where many producers sell products that are differentiated from one another.

Explanation

The production function represents the technological relationship between physical inputs and the resulting physical output of a production process. It specifies the maximum quantity of output that can be produced from a given combination of inputs, such as labor, capital, and land, under a specific state of technology. Mathematically, this relationship is expressed as Q = f(L, K), where Q is the quantity of output, and L and K represent inputs of labor and capital. It demonstrates how changes in input quantities affect the total volume of output produced.

Explanation

The Commission for Agricultural Costs and Prices (CACP) is an attached office of the Ministry of Agriculture and Farmers Welfare, Government of India. Established in 1965 as the Agricultural Prices Commission, it is mandated to recommend Minimum Support Prices (MSP) for essential agricultural products to motivate farmers to adopt modern technology and increase productivity. The CACP analyzes various factors such as the cost of production, changes in input prices, market price trends, demand and supply, and the effect on the cost of living to determine fair pricing recommendations for major agricultural commodities.

Explanation

The supply curve represents the relationship between the price of a product and the quantity supplied by producers. According to the law of supply, there is a direct or positive relationship between price and quantity supplied: as the market price increases, producers are incentivized to increase output to maximize profits. This direct relationship means that the supply curve is positively sloped from left to right.

From the perspective of production theory, a competitive firm's short-run supply curve is defined by the portion of its marginal cost curve that lies above the average variable cost. While increasing returns (where marginal cost falls) may occur during initial stages of production, a profit-maximizing firm will only operate in the stage of diminishing returns where marginal cost is rising. Thus, the effective supply curve remains positively sloped.

Explanation

Under Article 11 of the Constitution of India, the Parliament is vested with the exclusive power to regulate the right of citizenship by law. This article specifically provides that the Parliament has the authority to make any provision concerning the acquisition, termination, and all other matters related to citizenship. Pursuant to this constitutional authority, the Parliament enacted the Citizenship Act, 1955, which prescribes the rules, conditions, and procedures for obtaining and terminating Indian citizenship.

Explanation

The Estimates Committee consists of 30 members who are elected annually from amongst the members of the Lok Sabha. Rajya Sabha has no representation in this committee. The main function of the Estimates Committee is to examine the estimates included in the budget and suggest economies, public expenditure policies, and administrative reforms to ensure efficiency in administration.

Explanation

The Preamble to the Constitution of India explicitly resolves to secure to all its citizens justice, categorized as social, economic, and political. Economic justice in this context refers to the commitment to eliminate glaring inequalities in wealth, income, and property, while ensuring that every individual has equal opportunities to earn a decent livelihood and maintain a basic standard of living. By enshrining economic justice in its opening declaration, the Constitution establishes it as a core objective and foundational value of the Indian Republic.

Explanation

The Judiciary is designated as the ultimate interpreter and guardian of the Constitution. This role is primarily exercised through the power of judicial review, which empowers the courts to examine the constitutional validity of legislative enactments and executive orders. Under the Indian constitutional framework, the Supreme Court of India serves as the final authority to interpret the provisions of the Constitution, ensuring that the rule of law is maintained and that the fundamental rights of citizens are protected against any overreach or inconsistency with the constitutional text.

Explanation

Under Article 83(1) of the Constitution of India, the Rajya Sabha is a permanent body and is not subject to dissolution. However, the term of individual members elected to the Rajya Sabha is six years. This cycle of membership is structured such that one-third of the members retire every two years, ensuring that the chamber maintains continuous functioning and legislative experience without being completely refreshed at a single time.

Explanation

The Jnanpith Award (often transliterated as Jinapith) is India's highest and oldest literary honor. Established in 1961 by the Bharatiya Jnanpith, a cultural organization founded by the Sahu Jain family, the award is presented annually to Indian authors for their outstanding lifetime contributions to literature. It recognizes exceptional literary works in any of the 22 languages specified in the Eighth Schedule of the Constitution of India, as well as English. The first recipient of this prestigious award was the Malayalam writer G. Sankara Kurup in 1965.

Explanation

Boutros Boutros-Ghali was an Egyptian diplomat and politician who served as the sixth Secretary-General of the United Nations from 1 January 1992 to 31 December 1996. Since Egypt is situated on the African continent, his appointment made him the first African national to lead the United Nations.

Explanation

In 1928, the British government appointed the Simon Commission to suggest constitutional reforms for India. Because the commission did not include any Indian members, it was met with widespread protests and boycotts across the country. On October 30, 1928, Lala Lajpat Rai led a peaceful protest march in Lahore against the commission, using the slogan "Simon Go Back". During this demonstration, the police launched a brutal lathi charge on the protesters under the orders of the local police superintendent. Lala Lajpat Rai was severely assaulted and injured during the charge, and he died from these grievous injuries on November 17, 1928.

Explanation

The Rig-Vedic society was predominantly pastoral, and cattle, especially cows, formed the backbone of their economy. The Rig Veda contains frequent references to cows, which were treated as a primary measure of wealth and value. Conflicts and wars in this period were referred to as gavishti, which literally translates to a search for cows, indicating that battles were fought over the possession of cattle herds rather than land territory. Furthermore, the practice of dakshina or ritual gifts given to priests consisted mainly of cows and female slaves, while land was not yet considered a form of private property or a standard medium of donation. Together, these social, economic, and religious practices confirm that pastoralism was the primary mode of life for the early Aryans.

Explanation

The Khajuraho group of temples was built by the rulers of the Chandela dynasty between 950 AD and 1050 AD. Located in the Chhatarpur district of Madhya Pradesh, these temples are world-renowned for their Nagara-style architectural elegance and intricate sculptures. Prominent Chandela kings like Yashovarman and Dhanga Dev commissioned major temples in the complex, including the Lakshmana Temple and the Kandariya Mahadeva Temple, dedicated to Hindu deities and Jain tirthankaras.

Explanation

The Survey of India is the national survey and mapping organization of the country and is responsible for producing and maintaining all topographical maps of India.

Explanation

The United States is the world's largest producer of timber, particularly industrial roundwood, followed by countries such as China, Brazil, and Canada. Therefore, option A is the correct answer.

Explanation

Galena, chemically known as lead sulfide (PbS), is the primary and most abundantly mined ore of lead. It contains approximately 86.6% lead by weight and crystallizes in a distinct cubic system. Typically found in hydrothermal veins, it has been the principal source of global lead production for thousands of years due to its widespread geological availability and the relative ease with which lead can be smelted and extracted from it.

Explanation

Jute is a Kharif crop that requires a hot and humid climate for its cultivation. It grows best in regions with high temperatures ranging between 25°C and 35°C, heavy rainfall of about 150 cm to 250 cm, and fertile alluvial soil. The sowing season of jute begins between March and May depending on the onset of rains, and the harvesting takes place between July and September. Because it is grown during the monsoon season and harvested before autumn, it does not belong to the Rabi category.

Explanation

Population density is defined as the measurement of the number of people in an area relative to the size of the area they inhabit. It is calculated by dividing the total number of persons residing in a region by the total land area of that region. The standard unit of measurement for human population density is the number of persons per square kilometer or persons per square mile. This demographic metric helps in analyzing settlement patterns, resource allocation, and urbanization trends.

Explanation

Archaeopteryx represents a classic transitional link between reptiles and birds, possessing several distinct reptilian skeletal features. Among these are a long, bony tail made of free caudal vertebrae, teeth set in sockets on the jaws, and three distinct clawed digits on each wing representing the forelimbs. These characteristics are characteristic of theropod dinosaurs and are absent in modern birds, which have a shortened tail bone, a toothless beak, and fused wing digits.