E-PolyLearning

36. Which of the following was to be discovered first in the chromospheres of the sun?
a. Krypton
b. Xenon
c. Neon
d. Helium
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Answer: (d).Helium

37. Which of the following is in liquid form at room temperature?
a. Lithium
b. Sodium
c. Francium
d. Cerium
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Answer: (c).Francium

38. Sodium metal is kept under
a. petrol
b. alcohol
c. water
d. kerosene
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Answer: (d).kerosene

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
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Answer: (d).Copper, Tin

40. From which mineral is radium obtained?
a. Rutile
b. Haematite
c. Limestone
d. Pitchblende
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Answer: (d).Pitchblende