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General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
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Q. 1967
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The physical quantity which is measured as Kg m/s2 is:
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Q. 1966
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In medical terminology, USG stands for:
Explanation
- Correct answer: B Ultrasonography. USG is the use of high-frequency sound waves to create images of internal body structures.
- Key concept: Ultrasound waves reflect off tissues; the echoes are processed to form real-time images.
- Why others are wrong: AβUndersized gland is not a medical acronym for USG. CβUnsegmented gonads is not related to ultrasound terminology. DβNone of the above is incorrect since B is correct.
- Exam tip: Remember USG = Ultrasonography; often used for fetal imaging and abdominal scans.
Q. 1965
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Widal test is employed to diagnose:
Widal test is used to diagnose Typhoid.
- Key concept: detects serum antibodies (O and H antigens) against Salmonella Typhi in suspected typhoid fever using agglutination.
- Formula/logic: higher titers against O and/or H antigens indicate infection; rise in paired samples suggests active disease.
- Cholera, Tuberculosis, AIDS do not use Widal; they require other tests.
Q. 1964
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The brain of any computer system is:
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Q. 1899
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ATM means:
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Q. 1898
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Which of the following is the best conductor of heat ?
Correct option: B
- Why: Silver has the highest thermal conductivity among common materials due to its free electrons that rapidly transfer kinetic energy, enabling efficient heat flow.
- Key concept: Heat transfer by conduction in metals occurs mainly through free electrons; metals with more mobile electrons conduct heat better.
- Quick note: The conduction formula kΒ·AΒ·(dT/dx) shows that higher k (conductivity) gives faster heat transfer.
- Why others are incorrect: Mercury and other metals conduct less efficiently than silver; leather and benzene are insulators with very low conductivity.
- Exam tip: Remember βsilver is the best conductor of heatβ to pick option B quickly.
Q. 1897
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Glaciers always melt first at the:
- Correct answer: C β bottom
- Why: The base of a glacier receives heat from the ground (geothermal heat) and friction with the bed, causing basal (bottom) melting. Pressure at the base also lowers the melting point slightly, aiding melt.
- Key concept: basal melting due to heat transfer from below and friction; melting point depends on pressure (Clapeyron relation).
- Exam tip: Remember βglacier melts from the bottom firstβ because heat from bed and movement acts there.
- Why others are incorrect: Top and sides are insulated by snow/ice; middle remains colder as heat input is less, so they melt later.
Q. 1896
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Which among the following is the major cause of acid rain ?
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Q. 1884
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Which one of the following colours has longest
wave length ?
Explanation
- The correct color with the longest wavelength in visible light is Red.
- Key concept: In the visible spectrum, wavelength increases from violet to red. Red has the largest Ξ» (about 620β750 nm) and the smallest frequency among these colors.
Q. 1847
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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is:
Explanation
- Correct: Helium (C) is used to replace nitrogen in breathing mixtures for deep dives (Heliox).
- Reason: Helium is an inert, very light gas with lower density than nitrogen, reducing the work of breathing and narcosis at depth.
- Key concept: Gas density and narcotic potency affect underwater breathing; venture uses Heliox to minimize resistance and nitrogen narcosis.
- Exam tip: If asked about reducing narcosis or work of breathing in divers, think Helium.
- Why others wrong: Argon, Xenon, Krypton are heavier or less practical for deep diving; not standard substitutes for nitrogen in breathing mixes.
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