BPSC CCE Prelims
General Science Previous Year Questions (PYQs)
Solved Previous Year Questions (PYQs) for General Science in BPSC CCE Prelims in English & Hindi Medium.
Chapter Breakdown: Scroll →
Which of the following is equivalent to tesla?
Detailed Explanation:
Tesla (T) is the SI unit of magnetic flux density. From the Lorentz force equation for a current-carrying conductor: F = I ℓ B, rearranging gives B = F / (I ℓ).
Therefore, 1 Tesla = 1 Newton / (Ampere × meter), which matches Option 4: Newton per ampere meter.
Which part of alimentary canal receives bile from the liver?
Detailed Explanation:
Bile is produced by the liver and stored in the gallbladder.
It is released into the duodenum (first part of the small intestine) through the common bile duct, where bile salts emulsify fats for digestion.
Which of the following pairs will give displacement reactions?
Detailed Explanation:
Displacement reactions occur when a more reactive metal displaces a less reactive metal from its salt solution.
Copper (Cu) is more reactive than silver (Ag) but less reactive than sodium (Na), iron (Fe), and magnesium (Mg). Therefore, Cu can displace Ag from AgNO₃ solution, forming Cu(NO₃)₂ and depositing metallic Ag.
In other options: Cu cannot displace Na (option 2), Ag cannot displace Fe (option 3), and Al cannot displace Mg (option 4) due to reactivity series order.
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The process of breaking down organic matter by microorganisms is called?
Detailed Explanation:
Decomposition is the natural process by which microorganisms (bacteria, fungi, actinomycetes) break down dead organic matter into simpler inorganic substances.
The process involves fragmentation, leaching, catabolism, humification, and mineralization, releasing nutrients like nitrogen, phosphorus, and carbon dioxide back into the ecosystem.
Who was the first one to propose a model for the structure of an atom?
Detailed Explanation:
J.J. Thomson proposed the first atomic model in 1897, known as the plum pudding model, with electrons embedded in a positively charged sphere.
E. Goldstein discovered canal rays, Rutherford proposed the nuclear model in 1911, and Niels Bohr introduced the planetary model with fixed orbits in 1913.
Dalton's atomic theory successfully explained:
i. Law of conservation of mass
ii. Law of constant composition
iii. Law of radioactivity
iv. Law of multiple proportion
Detailed Explanation:
Dalton's atomic theory (1808) explained three fundamental laws of chemical combination:
✅ Law of conservation of mass: Atoms are neither created nor destroyed in reactions, so total mass remains constant.
✅ Law of constant composition: A compound always contains the same elements in fixed proportions by mass.
✅ Law of multiple proportions: When two elements form multiple compounds, mass ratios are simple whole numbers.
❌ Law of radioactivity: Radioactivity (discovered by Becquerel, 1896) involves nuclear changes, not explained by Dalton's indivisible atom concept.
Which of the following acids is secreted in the stomach?
Detailed Explanation:
Hydrochloric acid (HCl) is secreted by parietal cells in the gastric glands of the stomach.
It activates pepsinogen to pepsin for protein digestion, kills ingested bacteria, and maintains a pH of 1.5–3.5 in the stomach.
The meter that is used to measure the distance moved by the vehicle is known as:
Detailed Explanation:
Odometer is the instrument that measures the total distance traveled by a vehicle, displayed in kilometers or miles on the dashboard.
Ammeter measures electric current, Speedometer measures instantaneous speed, and Chronometer measures precise time.
Heat transfer that does not require a medium is called:
Detailed Explanation:
Radiation is the mode of heat transfer that does not require any material medium (solid, liquid, or gas).
It travels through electromagnetic waves (infrared rays) and can occur in vacuum, such as the Sun's heat reaching Earth through empty space.
Which of the following represents the suitable condition for the liquefaction of gases?
Detailed Explanation:
Low temperature reduces the kinetic energy of gas molecules, allowing intermolecular attractive forces to dominate.
High pressure brings molecules closer together, decreasing intermolecular distance and facilitating condensation into liquid phase. Each gas has a critical temperature above which liquefaction is impossible regardless of pressure.
Which of the following are the constituents of a soda acid fire extinguisher?
Detailed Explanation:
Soda acid fire extinguisher contains dilute sulphuric acid (H₂SO₄) and sodium bicarbonate (NaHCO₃) solution in separate compartments.
When activated, the acid reacts with sodium bicarbonate: 2NaHCO₃ + H₂SO₄ → Na₂SO₄ + 2H₂O + 2CO₂, producing carbon dioxide gas that smothers the fire by cutting off oxygen supply.
Option 3 is correct.
Which of the following bacterial diseases is called as splenic fever?
Detailed Explanation:
Anthrax is a bacterial disease caused by Bacillus anthracis that is commonly known as splenic fever due to the characteristic swelling and darkening of the spleen in infected animals.
It is a zoonotic disease affecting livestock and humans, occurring in three forms: cutaneous (skin), inhalation (respiratory), and gastrointestinal, transmitted through contact with infected animals or spores.
Which of the following radiation is used to get relief from body aches?
Detailed Explanation:
Infra-red radiation produces heat when absorbed by body tissues, which increases blood circulation, relaxes muscles, and reduces pain and stiffness.
UV radiation can damage skin and does not provide therapeutic heat; visible radiation lacks the penetrating warmth needed for pain relief.
Which one of the following is an example of melamine used for making floor tiles?
Detailed Explanation:
Melamine is a thermo-setting plastic that undergoes irreversible hardening when heated, forming a rigid three-dimensional network.
Used in floor tiles, kitchenware, and laminates, melamine-formaldehyde resin is heat-resistant, scratch-proof, and does not soften upon reheating. Polyethene, thermoplastics, and PVC are thermoplastics that soften when heated and can be remolded.
In which organisms does spore formation occur as a mode of reproduction?
Detailed Explanation:
Spore formation is an asexual reproduction method where organisms produce spores that develop into new individuals without gamete fusion.
✅ Fungi: Commonly reproduce via sporangiospores (Rhizopus, Mucor), conidia (Aspergillus, Penicillium), and basidiospores (mushrooms)—spore formation is their primary reproductive mode.
✅ Algae: Form zoospores (motile spores in Chlamydomonas, Ulothrix) and aplanospores (non-motile in Chlorella) during favorable or unfavorable conditions.
✅ Yeast: Primarily reproduce by budding, but form ascospores during sexual reproduction under stress conditions.
✅ Ferns (Pteridophytes): Produce spores in sporangia on leaf undersides; spores germinate into independent gametophytes (prothallus).
Correct Answer: All four options (Fungi, Algae, Yeast, Fern) utilize spore formation, though the question marks only Option 1 (Fungi) as correct, likely expecting the organism where spore formation is the primary mode.