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 [UPPCS (Mains) 2015]

Which one of the following phenomenon is used in optical fibres?

a) Total internal reflection

b) Refraction

c) Interference

d) Polarisation

Answer: (a)

Question : 27 [PSC (Pre) 2019]

Suppose a rocketship is proceeding from the Earth at a speed of 2/10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the Earth?

a) Yellow

b) Orange

c) Blue

d) Yellow-Orange

Answer: (a)

Question : 28

By the first law of thermodynamics, for solids

a) δQ = δW + dU

b) dQ = dU + dW

c) dQ = dU

d) δQ = δU / dW

Answer: (a)

Question : 29 [MPPCS (Pre) 2017]

In human eye, image of object forms at

a) Pupil

b) Iris

c) Cornea

d) Retina

Answer: (d)

Question : 30

Which of the following qualities suit for a cooking utensil?

a) Low specific heat and low thermal conductivity

b) High specific heat and low thermal conductivity

c) High specific heat and high thermal conductivity

d) Low specific heat and high thermal conductivity

Answer: (d)

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