149. When water is heated from 0°C to 10°C the volume of water: [CBI 1991]
(a) increases steadily
(b) decreases steadily
(c) first increases then decreases
(d) first decreases then increases
Ans : (d)
150. How should a man wearing spectacles work with a microscope? [RRB 1993]
(a) He should keep on wearing spectacles
(b) He should take off spectacles
(c) He cannot use the microscope at all
(d) Wearing or taking off makes little difference
Ans : (a)
151. The weight "of an object would be minimum when it is placed: [CDS 1992]
(a) at the equator
(b) at the North Pole
(c) at the South Pole
(d) at the centre of the earth
Ans : (d)
152. When an open bottle of scent is kept in a corner of the room, its odour is felt in all the corners, This is due to the phenomenon of:
[CBI1992]
(a) vaporisation
(b) evaporation
(c) diffusion
(d) sublimation
Ans : (c)
153. Speed of sound is greater in solids than in liquids because: [IFS 1989]
(a) the atoms in solids are regularly arranged
(b) the atoms in liquids are loosely packed
(c) the solids have high elasticity
(d) None of the above
Ans : (c)
154. Which of the following are phenomenon exhibited by sound waves? [NDA 1992]
1) Reflection
2) Refraction
3) Interference
4) Polarisation
5) Diffraction
(a) 1, 2, 3
(b) 1, 2, 3, 5
(c) 1, 3, 4, 5
(d) 2, 3, 4, 5
Ans : (b)
155. Match the following: [NDA 1990]
Parameters Dependence
A. lntensity of light 1. Properties of the
medium
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