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General Science MCQ

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:
  • A Work
  • B Power
  • C Force
  • D Motion
Correct Option: C  [ Force ]
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Q. 1966
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In medical terminology, USG stands for:
  • A Undersized gland
  • B Ultrasonography
  • C Unsegmented gonads
  • D None of the above
Correct Option: B  [ Ultrasonography ]
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Q. 1965
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Widal test is employed to diagnose:
  • A Typhoid
  • B Cholera
  • C Tuberculosis
  • D AIDS
Correct Option: A  [ Typhoid ] Stored explanation
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.
Why incorrect options
  • Cholera, Tuberculosis, AIDS do not use Widal; they require other tests.
Exam tip: Correlate Widal with clinical symptoms and other labs; single high titer may be due to past exposure or vaccination.
Q. 1964
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The brain of any computer system is:
  • A ALU
  • B Memory
  • C Control unit
  • D CPU
Correct Option: D  [ CPU ]
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Q. 1899
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ATM means:
  • A All Time Money
  • B Automatic Teller Machine
  • C Automated Teller Machine
  • D Any Time Money
Correct Option: C  [ Automated Teller Machine ]
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Q. 1898
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Which of the following is the best conductor of heat ?
  • A mercury
  • B silver
  • C leather
  • D benzene
Correct Option: B  [ silver ]
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Q. 1897
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Glaciers always melt first at the:
  • A top surface
  • B sides
  • C bottom
  • D middle surface
Correct Option: C  [ bottom ]
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Q. 1896
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Which among the following is the major cause of acid rain ?
  • A Carbon dioxide
  • B Carbon monoxide
  • C Oxygen
  • D Nitrogen dioxide
Correct Option: D  [ Nitrogen dioxide ]
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Q. 1884
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Which one of the following colours has longest wave length ?
  • A Green
  • B Yellow
  • C Red
  • D Blue
Correct Option: C  [ Red ] Stored explanation
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 λ (about 620–750 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:
  • A Argon
  • B Xenon
  • C Helium
  • D Krypton
Correct Option: C  [ Helium ] Stored explanation
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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