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

Answer and Explanation

Answer: Diamond

Explanation:
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02. Which of the following was to be discovered first in the chromospheres of the sun?
A. Krypton B. Xenon
C. Neon D. Helium

Answer and Explanation

Answer: Helium

Explanation:
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03. Most soluble in water is
A. camphor B. sulphur
C. common salt D. sugar

Answer and Explanation

Answer: sugar

Explanation:
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04. Galvanised iron sheets have a coating of
A. lead B. chromium
C. zinc D. tin

Answer and Explanation

Answer: zinc

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

Answer and Explanation

Answer: 3.5%

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