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

Which of the following is used to find the depth of sea?

a) ECHO

b) RADAR

c) SONAR

d) None of these

Answer: (c)

Question : 27

Soap bubble looks coloured due to

a) interference

b) dispersion

c) reflection

d) Any one of these

Answer: (a)

Interference at thin films causes colouring of soap bubble.

Question : 28

Consider two identical iron spheres , one which lie on a thermally insulating plate, while the other hangs from an insulatory thread. Equal amount of heat is supplied to the two spheres


physics heat mcq question answer 21

a) Their temperature will be equal

b) Temperature of A will be greater than B

c) Temperature of B will be greater than A

d) Can’t be predicted

Answer: (c)

The temperature of B will be higher because, due to expansion, the centre of mass of B will come down.

Same heat is supplied but in B, Potential energy is decreased therefore internal energy gain will be more.

Question : 29 [RAS/RTS (Pre) 1995]

A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear sound of the blow of workman twice. It is because of

a) The speed of sound is greater in air than in steel

b) Part of the sound wave is reflected between the rail tracks

c) The speed of sound is greater in steel than in air

d) His ears are at different distance from the source

Answer: (c)

Question : 30 [NDA]

Which one of the following is the mode of heat transfer in which warm material is transported so as to displace a cooler material ?

a) Convection only

b) Conduction only

c) Radiation

d) Both conduction and convection

Answer: (a)

IMPORTANT general science mcq EXERCISES

set 10 Online Quiz

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1648 heat wave motion sound optics oscillations based general science mcq set 10 question answer pdf
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