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 →
What is the device to protect equipments from the electric shock?
Detailed Explanation:
Fuse is a safety device containing a thin wire with low melting point that melts and breaks the circuit when excess current flows, protecting equipment from electric shock, overload, and short circuits.
Generator produces electricity, Motor converts electrical to mechanical energy, and Current controller regulates current but does not automatically disconnect during faults—only the fuse provides automatic protection.
pH value of 0.1N HCl solution is approximately:
Detailed Explanation:
HCl is a strong acid that dissociates completely: HCl → H⁺ + Cl⁻. For a monoprotic acid, 0.1N = 0.1M, so [H⁺] = 0.1 M.
pH = -log[H⁺] = -log(0.1) = -(-1) = 1.0. Options with pH 10 or 11 indicate basic solutions, not acids. pH 2.0 would require [H⁺] = 0.01 M, which is ten times more dilute.
Which Compound is known as night glowing pigment from below?
Detailed Explanation:
Europium-doped strontium aluminate (SrAl₂O₄:Eu²⁺,Dy³⁺) is the most efficient modern phosphorescent material used in night glowing pigments.
It absorbs light energy and slowly releases it in darkness, providing a bright afterglow lasting up to 12 hours. Other compounds listed (copper sulphide-doped zinc oxide, barium sulphate-doped copper carbonate, boron oxide-doped copper sulphate) do not exhibit significant or efficient phosphorescence for glow-in-the-dark applications.
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Which Material is used for smart film?
Detailed Explanation:
Smart films switch transparency when voltage is applied, requiring a material that is both electrically conductive and optically transparent.
Indium tin oxide (ITO) is a transparent conducting oxide used in smart films, touchscreens, and LCDs. Calcium carbonate is a non-conductive filler in plastics. Zinc chloride is used in batteries, not films. Silica is an insulator used in glass.
Reactance of a capacitor is
Detailed Explanation:
Capacitive reactance (Xc) is given by the formula Xc = 1/(2πfC), where f is frequency and C is capacitance.
Since f appears in the denominator, as frequency increases, reactance decreases — meaning Xc ∝ 1/f (inversely proportional to frequency).
Which metal compound is used for treatment of carcinoma?
Detailed Explanation:
Platinum compounds, particularly Cisplatin, are used as chemotherapeutic agents for treating carcinoma by binding to DNA in cancer cells and causing cell death.
Cisplatin is effective against testicular, ovarian, lung, and bladder cancers. Other metals like Chromium (toxic), Iron (nutrient), and Chlorine (disinfectant) are not used for cancer treatment.
Which compound is used in contraceptive pills?
Detailed Explanation:
Levonorgestrel is a synthetic progestin hormone widely used in oral contraceptive pills and emergency contraception; it prevents pregnancy by inhibiting ovulation, thickening cervical mucus, and altering the uterine lining.
Cholecalciferol is Vitamin D3, Venlafaxine is an antidepressant, and Cetirizine is an antihistamine for allergies—none have contraceptive properties.
Why oil is not stored in galvanized iron pot?
Detailed Explanation:
Galvanized iron is coated with zinc, which reacts with oil components to form toxic zinc compounds that make the oil unsafe for consumption.
The chemical reaction also causes rancidity, degrading the oil's taste, smell, and nutritional quality.
Moisture and acidic impurities in oil corrode the zinc coating, exposing the underlying iron to rust formation.
Since all three effects—toxicity, quality degradation, and corrosion—occur simultaneously, the correct answer is All of above.
Which compound is used for increase of octane rating?
Detailed Explanation:
Tetraethyllead (TEL) was historically the most widely used anti-knock agent added to gasoline to increase octane rating and prevent engine knocking.
Though highly effective, TEL is toxic and has been phased out globally; modern fuels use unleaded alternatives like ethanol and aromatic hydrocarbons.
Full form of PHBV biodegradable polymer.
Detailed Explanation:
PHBV stands for Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), a biodegradable copolymer produced by bacterial fermentation.
The prefix "co" indicates it is a copolymer formed from two monomer units: 3-hydroxybutyrate and 3-hydroxyvalerate, making it an eco-friendly alternative to conventional plastics.
Hormones are secreted by:
Detailed Explanation:
Endocrine glands (such as pituitary, thyroid, adrenal glands) secrete hormones directly into the bloodstream to regulate body functions.
Exocrine glands (like sebaceous and sweat glands) release substances through ducts, not into the blood, so they do not secrete hormones.
A nail is nailed into the trunk of a tree at a point 1 m from the soil level. After 2 years the nail will
Detailed Explanation:
Trees grow in height from apical meristems (shoot and root tips), not by elongating the trunk itself.
The nail remains at 1 m height because secondary growth (cambium activity) only increases girth, not vertical position of existing trunk sections.
Which one of the following terms characterizes the interaction between the herpes simplex virus and a human?
Detailed Explanation:
Parasitism is a biological interaction where the parasite benefits while the host is harmed.
The herpes simplex virus infects human cells, uses the host's cellular machinery to replicate, damages cells, and causes diseases like cold sores or genital herpes, clearly harming the host while benefiting itself — a classic example of parasitism.
Which class of immunoglobulin is the first to be produced in response to an infection?
Detailed Explanation:
IgM (Immunoglobulin M) is the first antibody produced during the primary immune response to a new infection.
IgM has a pentamer structure that enables rapid agglutination and complement activation, providing immediate defense before IgG levels rise in secondary responses.
The biological membranes are composed of:
Detailed Explanation:
Biological membranes consist of a phospholipid bilayer with embedded proteins in varying proportions.
The exact ratio of lipids and proteins is specific to each species, cell type, and organelle – e.g., mitochondrial membranes have different composition than plasma membranes.