71. C2H2 molecule has _ covalent bonds.
(A) 2
B) 3
(C) 4
(D) 5
72. Stainless steel is an alloy of:
A. Iron, carbon, and Nickel
B. Iron and manganese
C. Iron, chromium, and Zinc
D. Iron, Chromium, and Nickel
73. Which of the following is the chemical name of the salt we use in our kitchen?
A. Sodium Chloride
B. Ammonia
C. Sodium Carbonate
D. Calcium Chloride
74. Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission?
A. Uranium
B. Plutonium
C. Boron
D. Heavy water
75. Glycol is added to aviation gasoline because it:
A. Prevents freezing of petrol
B. Reduces the consumption of petrol
C. Reduces the evaporation of petrol
D. Increases the efficiency of petrol
76. Which of the following solutions is used in photography?
A. Sodium thiosulfate
B. Sodium Silver
C. Silver Bromide
D. Silver Salt
77. Which gas is filled in refrigerators?
A. Acetylene
B. Methane
C. Chlorofluorocarbon
D. Mafron
78. Which of the following is the conductor of electricity?
A. Saline water
B. Warm water
C. Cold water
D. Distilled water
79. Which one of the following is used as a moderator in a nuclear reactor?
A. Radium
B. Ordinary water
C. Thorium
D. Heavy water
80. Which of the following is used as laughing gas?
A. Nitrogen trioxide
B. Nitrogen oxide
C. Nitrous oxide
D. None of these
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