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 →
How is Hydrogen stored physically?
Detailed Explanation:
Physical storage of hydrogen means storing H₂ gas without any chemical transformation.
Compressing hydrogen gas into high-pressure tanks (350–700 bar) is the most common physical storage method – no chemical bonds are formed or broken.
Hydrides involve chemical bonding with metals/alloys (chemical storage), and water (H₂O) is a compound, not free hydrogen gas.
As the diameter of objective lens of a telescope increases, the resolution of telescope
Detailed Explanation:
Resolution of a telescope is its ability to distinguish between two closely spaced objects and is inversely proportional to the angular resolution θ.
According to Rayleigh's criterion, θ = 1.22λ/D, where λ is the wavelength of light and D is the diameter of the objective lens. As D increases, θ decreases, meaning the telescope can resolve finer details — hence resolution increases.
A larger aperture also collects more light, further improving image clarity and the ability to separate closely spaced objects.
Compared to a burn due to air at 100°C, the burn due to steam at 100°C is
Detailed Explanation:
Steam at 100°C contains latent heat of vaporization (540 cal/g) in addition to thermal energy, while air at 100°C has only thermal energy.
When steam condenses on skin, it releases this extra latent heat, transferring significantly more total energy than hot air, causing deeper and more severe burns.
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Light weight bullet proof helmets and jackets use which of the following fibres for their production?
Detailed Explanation:
Kevlar is a synthetic aramid fibre developed by DuPont in 1965, known for its extremely high tensile strength (5 times stronger than steel by weight) and low weight.
Its unique properties include bullet energy absorption and dispersion, flexibility, heat resistance, and fire resistance, making it the preferred material for lightweight bulletproof helmets and jackets. Terylene and Nylon lack the necessary impact resistance for ballistic protection.
What is the unit of measure of magnetic field?
Detailed Explanation:
The SI unit of magnetic field (magnetic flux density) is Tesla (T), named after physicist Nikola Tesla.
Cobalt is a ferromagnetic metal, Ampere measures electric current, and Ohm measures electrical resistance—none measure magnetic field strength.
Besides spreading Malaria, Anopheles mosquito's are also vectors of
Detailed Explanation:
Anopheles mosquitoes are primary vectors of malaria (caused by Plasmodium), and also transmit lymphatic filariasis (caused by Wuchereria bancrofti and Brugia species) and certain types of encephalitis (such as O'nyong-nyong fever in Africa).
Dengue is transmitted exclusively by Aedes mosquitoes (Aedes aegypti and Aedes albopictus), not Anopheles, making options 1 and 2 incorrect.
Blood group of an individual is determined by
Detailed Explanation:
Blood group is determined by specific antigens present on the surface of red blood cells (RBCs), not by haemoglobin, WBC/RBC combination, or RBC shape.
The ABO system uses A and B antigens (Type A has A antigen, Type B has B antigen, Type AB has both, Type O has neither), while the Rh system uses the D antigen (present = Rh-positive, absent = Rh-negative).
Haemoglobin carries oxygen and does not determine blood group; WBC/RBC combination refers to cell counts, not blood typing; RBC shape is related to disorders like sickle cell anemia, not blood group determination.
One of the properties associated with X-rays is that they can be deflected by
Detailed Explanation:
X-rays are electromagnetic waves with no electric charge, so they travel unaffected by electric or magnetic fields.
Only charged particles (like electrons, protons, alpha particles) experience deflection in electric or magnetic fields; neutral electromagnetic radiation (X-rays, gamma rays, light) passes straight through.
Which of the following is responsible for production of shadow?
Detailed Explanation:
Shadows are formed because light travels in straight lines, a property called rectilinear propagation.
When an opaque object blocks light's path, it cannot bend around the obstacle, creating a dark region (shadow) behind it. Polarisation relates to wave orientation, diffraction to bending at edges, and interference to wave overlap patterns—none directly cause shadows.
An electron of mass M kg and charge e coulomb travels from rest through a potential difference of V volts. The final energy in joules would be
Detailed Explanation:
When a charged particle accelerates through a potential difference V, the work done by the electric field equals W = charge × voltage = eV joules.
Since the electron starts from rest, all this work converts into kinetic energy, making the final energy = eV joules. The mass M determines the final velocity but does not appear in the energy equation.
When antigens are introduced in the body through vaccination antibodies are produced to fight off infection
Detailed Explanation:
B cells produce antibodies when antigens are introduced through vaccination.
T cells provide helper functions to activate B cells but do not produce antibodies themselves; only B cells differentiate into plasma cells that secrete antibodies.
Which of the following vitamins are water soluble?
Detailed Explanation:
Vitamins A, D, E, and K are fat-soluble vitamins that dissolve in fats and oils and are stored in the body's fatty tissues and liver.
Vitamin B-complex (B1, B2, B3, B5, B6, B7, B9, B12) and Vitamin C are water-soluble vitamins that dissolve in water, are not stored in the body, and must be replenished regularly through diet.
Since Vitamin A, D, and K listed in options 1–3 are all fat-soluble, the correct answer is "None of these".
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 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 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).