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 a non-sense codon?
Detailed Explanation:
Nonsense codons (also called stop codons) signal the termination of protein synthesis and do not code for any amino acid. The three stop codons are UAA, UAG, and UGA.
AUG is the start codon coding for methionine; UUU codes for phenylalanine; UGC codes for cysteine. Only UAA is a nonsense codon among the given options.
Actual site of dark reaction in photosynthesis inside cytoplast is
Detailed Explanation:
Dark reaction (Calvin cycle) occurs in the stroma of the chloroplast, the fluid-filled region surrounding the grana.
Granum (stacks of thylakoid membranes) and grana lamella (connections between grana) are sites of light reactions, not dark reactions.
Catalyst used in hydrogenation of vegetable oil into vanaspati ghee is
Detailed Explanation:
Nickel (Ni) is the industrial catalyst used in the hydrogenation of vegetable oils to produce vanaspati ghee.
The process converts unsaturated fats (liquid oils) into saturated fats (solid ghee) by adding hydrogen in the presence of finely divided nickel at 140–225°C.
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Xylem in plants is responsible for following function:
Detailed Explanation:
Xylem is a vascular tissue that transports water and dissolved minerals upward from roots to stems and leaves.
Phloem transports organic nutrients (food and amino acids), while gases diffuse through stomata and intercellular spaces, not through xylem.
Which of the following is not an electrophile?
Detailed Explanation:
Electrophiles are electron-deficient species that accept electron pairs, typically carrying a positive charge or having an incomplete octet.
Na⁺ (sodium ion) has a stable noble-gas configuration (1s²2s²2p⁶) with no empty orbitals available to accept electrons, making it a spectator ion rather than an electrophile.
BF₃ (boron trifluoride) has an incomplete octet on boron (only 6 electrons), allowing it to act as a Lewis acid and electrophile.
H⁺ (proton) has no electrons and readily accepts electron pairs, making it a strong electrophile.
Who was first to use the characteristics of vascular tissues in the classification of plants?
Detailed Explanation:
Augustin Pyramus de Candolle was the first botanist to use vascular tissue characteristics (xylem and phloem) for plant classification, dividing plants into vascular (tracheophytes) and non-vascular (bryophytes) groups.
Engler and Prantl developed a phylogenetic system later, while Bentham and Hooker used morphological traits in their natural system, neither being first to use vascular tissues.
The part which we eat in Mango is :
Detailed Explanation:
Mango is a drupe fruit with three layers in its fruit wall (pericarp).
The epicarp is the outer skin, the mesocarp is the thick, fleshy, edible middle layer, and the endocarp is the hard stone surrounding the seed.
We eat the mesocarp – the juicy, sweet flesh of the mango.
In mycorrhizal association, the advantage of plant is :
Detailed Explanation:
Mycorrhizal association is a symbiotic relationship between fungi and plant roots where the fungal hyphae increase root surface area for enhanced mineral absorption (especially phosphorus) and form a protective barrier against soil-borne pathogens.
✅ Option 4 – Correct: Increased mineral absorption and disease protection are the two primary advantages the plant receives from mycorrhizal fungi.
❌ Option 1 – Incomplete: Protection is only one of the benefits.
❌ Option 2 – Incorrect: The plant provides food (carbohydrates) to the fungus, not vice versa.
❌ Option 3 – Incorrect: Combines an incomplete and an incorrect option.
The conductivity of a strong electrolyte
Detailed Explanation:
Conductivity (specific conductivity) measures the ability of a unit volume of solution to conduct electricity, depending on number of ions per unit volume.
On dilution, total ions remain constant but volume increases, so ion concentration per unit volume decreases, causing conductivity to decrease. (Note: Molar conductivity increases with dilution, but the question asks about conductivity.)
For two liquids A and B to form an ideal solution
Detailed Explanation:
An ideal solution follows Raoult's law where intermolecular forces between A–A, B–B, and A–B molecules are approximately equal.
Enthalpy of mixing (ΔHmix) = 0 because no heat is absorbed or released during mixing.
Entropy of mixing (ΔSmix) > 0 (positive) due to increased randomness, and Free energy of mixing (ΔGmix) < 0 (negative), making the process spontaneous.
Liver stores
Detailed Explanation:
The liver stores several vitamins essential for bodily functions.
Vitamin A is stored in large quantities (up to 2 years' supply) for vision, immunity, and cell growth.
Vitamin D is stored as calcifediol, regulating calcium absorption and bone health.
Vitamin B12 (cobalamin) is the only water-soluble vitamin significantly stored by the liver (up to 3–5 years' supply), supporting red blood cell formation and nerve function.
Vitamin C (ascorbic acid) is retained in smaller amounts for short-term use in collagen synthesis and immune function.
Thus, the liver stores vitamins A, B (especially B12), C, and D.
There is no atmosphere on the surface of the moon because
Detailed Explanation:
The Moon lacks an atmosphere because its escape velocity (2.38 km/s) is lower than the root mean square (rms) velocity of gas molecules like hydrogen and helium (1–1.5 km/s).
When the rms velocity exceeds escape velocity, gas molecules possess enough kinetic energy to overcome the Moon's weak gravitational pull and escape into space. In contrast, Earth's escape velocity (11.2 km/s) is sufficiently high to retain atmospheric gases.
In the following question, out of four words given below, three are alike in some manner and fourth word is different. Find the different one.
Detailed Explanation:
Telescope, Microscope, and Periscope are optical instruments that use lenses and mirrors to view objects (distant, tiny, or around obstacles).
Stethoscope is an acoustic medical device used to listen to internal body sounds (heartbeat, lung sounds), not for viewing.
Quinine is a common drug for malaria that is obtained from a plant. Which part of the plant yields this drug?
Detailed Explanation:
Quinine is an alkaloid drug used to treat malaria, extracted from the stem bark of the Cinchona tree.
The bark tissues contain the highest concentration of quinine and related alkaloids, which are harvested, dried, and processed for medicinal use; leaves and roots contain negligible amounts.
Turmeric powder is obtained from which part of turmeric plant?
Detailed Explanation:
Turmeric powder is obtained from the dried rhizome (underground stem) of the turmeric plant, not from root, foot, or seed.
A rhizome is botanically a modified stem that grows horizontally underground; it is distinct from true roots which absorb water and nutrients.
Options 1 ("Dried foot" - not a plant part), 2 ("Dried root" - incorrect organ), and 3 ("Seed" - turmeric rarely produces viable seeds) are all incorrect, making Option 4 ("None of the above") the correct answer.