41) What is laughing gas?
A. Nitrous Oxide
B. Carbon monoxide
C. Sulphur dioxide
D. Hydrogen peroxide
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Answer Option A
42) 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 Option B
43) Diamond is an allotropic form of
A. germanium
B. carbon
C. silicon
D. sulphur
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Answer Option B
44) Which of the following is in liquid form at room temperature?
A. Lithium
B. Sodium
C. Francium
D. Cerium
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Answer Option C
45) 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 Option D
 Questions in Competitive Examinations){kind=link}