general science questions

36.

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

Answer: Option D

Explanation:

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37.

Which of the following is in liquid form at room temperature?
A.     Lithium    B.     Sodium
C.     Francium    D.     Cerium
Answer & Explanation

Answer: Option C

Explanation:

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38.

Sodium metal is kept under
A.     petrol    B.     alcohol
C.     water    D.     kerosene
Answer & Explanation

Answer: Option D

Explanation:

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39.

Which of the following are the ingredients of gun metal?
A.     Iron, Zinc, Titanium
B.     Iron, tin
C.     Iron, Brass, Tin
D.     Copper, Tin
Answer & Explanation

Answer: Option D

Explanation:

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40.

From which mineral is radium obtained?
A.     Rutile    B.     Haematite
C.     Limestone    D.     Pitchblende
Answer & Explanation

Answer: Option D

Explanation:

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