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:
No answer description available for this question.