50 Most Expected General Knowledge (Science) Questions in Competitive Examinations

50 Most Expected General Knowledge (Science) Questions in Competitive Examinations

6) The hardest substance available on earth is
A. Gold
B. Iron
C. Diamond
D. Platinum

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Answer Option C

7) Tetraethyl lead is used as
A. pain killer
B. fire extinguisher
C. mosquito repellent
D. petrol additive

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Answer Option D

8) 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

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Answer Option C

9) The property of a substance to absorb moisture from the air on exposure is called
A. osmosis
B. deliquescence
C. efflorescence
D. desiccation

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Answer Option B

10) The average salinity of sea water is
A. 3%
B. 3.5%
C. 2.5%
D. 2%

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Answer Option B

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