(a) 200 cm
(b) 100cm
(c) 50 cm
(d) 2 cm
Ans: (c)
120. The colour of an opaque object is due to that colour which: [IAS (Pre)
1994]
(a) is absorbed
(b) is not reflected
(c) is reflected
(d) is scattered
Ans: (b)
121. Which one of the following pairs does not have the same dimension
[NDA 2010]
(a) Potential energy and kinetic energy
(b) Density and specific gravity
(c) Focal length and height
(d) Gravitational force and frictional force
Ans: (b)
122. The best and the poorest conductors of heat are respectively? [NDA
2010]
(a) silver (Ag) and lead (Pb)
(b) Copper(Cu) and aluminium (AI)
(c) silver (Ag) and gold (Au)
(d) copper (Cu) and gold (Au)
Ans: (a)
123. The three fundamental colours are: [MPPCS (Pre) 2004, RRB TC 2005]
(a) blue, yellow and red
(b) blue, green and red
(c) yellow, green and red
(d) blue, yellow and green
Ans: (b)
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