70th BPSC Prelims 2024
General Science Previous Year Questions (PYQs)
Explore 23 solved 70th BPSC Prelims 2024 General Science questions with detailed step-by-step bilingual solutions, option analysis, and answer keys.
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.
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.
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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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 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 of the following the chlorophyll in photosynthesis is used for?
Detailed Explanation:
Chlorophyll is the green pigment in plants that absorbs light energy, primarily in the blue and red wavelengths.
This absorbed light energy drives the light-dependent reactions of photosynthesis, converting light into chemical energy (ATP and NADPH).
Which of the following is the value of solar constant?
Detailed Explanation:
The solar constant is the amount of solar energy received per unit area at the top of Earth's atmosphere, perpendicular to the Sun's rays.
Its precise value is approximately 1.366 kW/m² (or 1366 W/m²), but for simplicity in calculations and standard examinations, it is commonly rounded to 1.4 kW/m² (1400 W/m²).
Which of the following are exothermic processes?
i. Evaporation of water.
ii. Dilution of an acid (H2SO4).
iii. Reaction of water with quick lime.
iv. Sublimation of camphor (crystals).
Detailed Explanation:
Exothermic processes release heat to surroundings; endothermic processes absorb heat.
i. Evaporation of water – absorbs heat from surroundings (endothermic).
ii. Dilution of H₂SO₄ – releases large amount of heat when water is added (exothermic).
iii. Reaction of water with quick lime (CaO) – forms slaked lime with vigorous heat release (exothermic).
iv. Sublimation of camphor – solid to gas transition requires heat absorption (endothermic).
Only ii and iii are exothermic.
Which of the following is the resistance of the wire?
Detailed Explanation:
Ohm's Law defines the relationship between voltage (V), current (I), and resistance (R) as V = IR.
Rearranging this formula gives R = V/I, which is the standard definition of resistance in ohms (Ω).
Which of the following is a non-contact force?
Detailed Explanation:
Non-contact forces act on objects without physical touch between them, examples include magnetic force, gravitational force, and electrostatic force.
Magnetic force operates through a magnetic field and can attract or repel objects from a distance without direct contact.
Frictional force and impact force both require physical contact between surfaces or objects, making them contact forces.
What is the structural and functional unit of life?
Detailed Explanation:
Cell is the smallest structural and functional unit of life, discovered by Robert Hooke in 1665.
Cells perform all essential life processes (metabolism, respiration, growth, reproduction) and form the building blocks of tissues, organs, and organisms.
Which of the following is the fluid part of the blood?
Detailed Explanation:
Plasma is the fluid (liquid) part of blood, making up about 55% of total blood volume.
RBCs, WBCs, and platelets are cellular (solid) components suspended in plasma.
Which of the following is the first artificially prepared element?
Detailed Explanation:
Technetium (Tc) is the first artificially prepared element, synthesized in 1937 by Carlo Perrier and Emilio Segrè by bombarding molybdenum with deuterons in a cyclotron.
Tellurium (Te), Thorium (Th), and Thallium (Tl) are all naturally occurring elements found in Earth's crust.
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.
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.
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 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 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 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.
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.
Showing 1 to 20 of 23 questions
70th BPSC Prelims 2024 - General Science Chapter-wise Distribution
Chemistry
8 Qs (34.8%)Physics
7 Qs (30.4%)Biology
6 Qs (26.1%)Human Health and Diseases
1 Qs (4.3%)Environmental Science
1 Qs (4.3%)70th BPSC Prelims 2024 - General Science Questions FAQs
Q1 How many General Science questions were asked in 70th BPSC Prelims 2024?
Q2 What is the chapter-wise question distribution for General Science in 70th BPSC Prelims 2024?
- Chemistry: 8 questions (34.8%)
- Physics: 7 questions (30.4%)
- Biology: 6 questions (26.1%)
- Human Health and Diseases: 1 questions (4.3%)
- Environmental Science: 1 questions (4.3%)