E-PolyLearning

41. What is laughing gas?
a. Nitrous Oxide
b. Carbon monoxide
c. Sulphur dioxide
d. Hydrogen peroxide
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Answer: (a).Nitrous Oxide

42. Actinides are the elements with atomic numbers from
a. 97 to 104
b. 101 to 115
c. 89 to 103
d. 36 from 43
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Answer: (c).89 to 103

43. The two elements that are frequently used for making transistors are
a. boron and aluminium
b. silicon and germanium
c. iridium and tungsten
d. niobium and columbium
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Answer: (b).silicon and germanium

44. The filament of an electric bulb is made of
a. tungsten
b. nichrome
c. graphite
d. iron
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Answer: (a).tungsten

45. Diamond is an allotropic form of
a. germanium
b. carbon
c. silicon
d. sulphur
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Answer: (b).carbon