(c) chloride and sulphate of calcium and magnesium
(d) None of these
Ans: (c)
120. The heavy water is a type of: [UPPCS (Pre) 1993]
(a) coolent
(b) moderator
(c) ore
(d) fuel
Ans: (b)
121. In all biological compounds the most fundamental element is: [UPPCS (Pre) 2003]
(a) nitrogen
(b) oxygen
(c) carbon
(d) sulphur
Ans: (c)
122. In which of the following carbon is not present? [42nd BPSC (Pre) 1998]
(a) diamond
(b) graphite
(c) coal
(d) None of these
Ans: (d)
123. Which one of the following can replace hydrogen from the acids and forms salt? [NDA 2010]
(a) Sulphur (S)
(b) Silicon (Si)
(c) Zinc (Zn)
(d) Phosphorus (P)
Ans: (c)
124. The percentage content of carbon is found to be maximum in : [UPPCS (Pre) 1999]
(a) bituminous
(b) lignite
(c) peat
(d) anthracite
Ans: (d)
125. The ordinary and general type of coke is : [39th BPSC (Pre) 1994]
(a) anthracite
(b) lignite
(c) bituminous
(d) peat
Ans: (c)
126. The polluted gas emitted from the vehicles is mainly: [BPSC 2001]
(a) Carbondioxide
(b) Carbon monoxide
(c) Marsh gas
(d) Nitrogen oxide
Ans: (b)
127. Which one of following sets of elements was primarily responsible for the origin of life on the Earth? [CSAT, 2012]
(a) Hydrogen, Oxygen, Sodium
(b) Carbon, Hydrogen, Nitrogen
(c) Oxygen, Calcium, Phosphorus
(d) Carbon, Hydrogen, Potassium
Ans: (a)
128. Dry ice is :
(a) Solid water
(b) Solid CO2
(c) Solid H2O2
(d) Dehydrated ice
Ans: (b)
129. Quartz is composed of: [SSC Grad. 2004]
(a) Calcium sulphate
(b) Calcium silicate
(c) Sodium sulphate
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