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 : 26

When vapour condenses into liquid

a) its temperature rises

b) it absorbs heat

c) it liberates heat

d) its temperature decreases

Answer: (c)

Question : 27 [NDA]

The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used ?

a) 56 r.p.m.

b) 78 r.p.m.

c) 45 r.p.m.

d) 33 r.p.m.

Answer: (a)

Question : 28 [Uttarakhand Lower Sub. (Pre) 2010]

The heat required in calories to convert one gram of ice at 0°C to steam at 100°C is approximately

a) 336

b) 720

c) 80

d) 620

Answer: (b)

Question : 29 [UPPCS (Pre) 1994]

When a glass rod is placed in steam, its length increases but its width

a) Decreases

b) Increases

c) Remains unchanged

d) Becomes irregular

Answer: (b)

Question : 30 [PCS (Pre) 2003]

The speed of light in vacuum is nearly

a) 3 × $10^8$ km/s

b) 3 × $10^8$ m/s

c) 3 × $10^10$ m/s

d) 3 × $10^8$ light years

Answer: (b)

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1640 light thermodynamics sound optics and oscillations based general science mcq set 2 question answer pdf
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