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 : 21

The sprinkling of water slightly reduces the temperature of a closed room because

a) water has large latent heat of vaporisation

b) temperature of water is less than that of the room

c) specific heat of water is high

d) water is a bad conductor of heat

Answer: (a)

Question : 22 [NDA]

Which one among the following denotes the smallest temperature?

a) 1° on the Kelvin scale

b) 1° on the Celsius scale

c) 1° on the Fahrenheit scale

d) 1° on the Reaumur scale

Answer: (a)

Question : 23 [UPPCS (Mains) 2011]

Red light signal is used as a danger signal because

a) It produces least chemical reaction

b) This is comfortable for eyes

c) Red light is scattered least

d) It is least absorbed in air

Answer: (c)

Question : 24 [IAS Prelim]

Strips of two metals A and B are firmly joined together as shown in the figure. On heating, A expands more than B does. If this jointed strip is heated, then it will appear as 


sound oscillations heat thermodynamics question answer 40

a) Figure a

sound oscillations heat thermodynamics question answer 40 option b

b) Figure b

sound oscillations heat thermodynamics question answer 40 option a

c) Figure c

sound oscillations heat thermodynamics question answer 40 option c

d) Figure d

sound oscillations heat thermodynamics question answer 40 option d

Answer: (a)

Question : 25

In order that the heat flows from one part of a solid to another part, what is required?

a) Density gradient

b) Uniform density

c) Temperature gradient

d) Uniform temperature

Answer: (c)

As heat flows from higher temperature to lower temperature, so a temperature gradient is required.

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