GROWTH AND NUTRITION OF BACTERIA 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: 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: Option C

Explanation:

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38. Sodium metal is kept under
A. petrol B. alcohol
C. water D. kerosene

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: Option D

Explanation:

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

Answer: Option D

Explanation:

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