light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 16 [IAS (Pre) 2001]

What changes will the volume of water show if the temperature is lowered from 9ºC to 3ºC?

a) The volume will first increase and then decrease

b) The volume will first decrease and then increase

c) The volume will not change

d) Water will freeze

Answer: (b)

Question : 17 [RAS/RTS (Pre) 2007]

The Sun is visible to us a few minutes before the actual sunrise because of

a) Total internal reflection of light

b) Diffraction of light

c) Scattering of light

d) Refraction of light

Answer: (d)

Question : 18

Two spheres of same size are made of the same metal but one is hollow and the other is solid. They are heated to same temperature, then

a) solid sphere will expand more than the hollow one

b) both spheres will expand equally

c) hollow sphere will expand more than the solid one

d) None of the above

Answer: (b)

Question : 19

The fine powder of a coloured glass is seen as

a) black

b) coloured

c) white

d) that of the glass colour

Answer: (c)

All colours are reflected.

Question : 20

Heat travels through vacuum by

a) Radiation

b) Conduction

c) Convection

d) Both (a) and (b)

Answer: (a)

Heat radiations are electromagnetic waves of high wavelength.

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