91) Atomic weight of uranium is
(A) 237
(B) 238
(C) 226
(D) 242
92) Which among the following liquid state at normal temperature?
(A) Mercury
(B) Sodium
(C) Phosphorus
(D) None of these
93) Which of the following gas is used in cigarette lighters?
(A) Butane
(B) Methane
(C) Propane
(D) Radon
94) Liquefied petroleum gas (LPG) consists of
(A) Butane and propane
(B) Ethane and hexane
(C) Ethane and nonane
(D) None of these
95) Which of the following is fire resistant?
(A) Asbestos
(B) Gypsum
(C) Dolomite
(D) None of these
96) Which of the following is used for silvering of mirrors?
(A) Silver oxide
(B) Zinc nitrate
(C) Silver nitrate
(D) Pitchblende
97) Raw materials used for manufacture of glass are
(A) Sand/soda/limestone
(B) Sand/charcoal/soda
(C) Limestone/charcoal/sulphur
(D) Sand/sulphur/soda
98) Solder is an alloy of
(A) Tin and lead
(B) Tin and zinc
(C) Zinc and lead
(D) Zinc and copper
99) Why does milk curdle?
(A) Fermentation of lactose
(B) Reaction of microbes
(C) Overheating
(D) Fungus growth
100) Which of the following is the lightest gas?
(A) Nitrogen
(B) Hydrogen
(C) Ammonia
(D) Carbon dioxide