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]

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Question : 16 [IAS (Pre) 2007]

Assertion (A):
A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level.
Reason (R):
The velocity of sound depends on the temperature of the surrounding medium.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Answer: (d)

Question : 17 [PSC (Pre) 2018]

Which one of the colours has the longest wavelength?

a) Blue

b) Yellow

c) Green

d) Red

Answer: (d)

Question : 18

A well cut diamond appears bright because

a) of the total internal reflection

b) of reflection of light

c) of dispersion of light

d) of refraction of light

Answer: (a)

Question : 19 [UPPCS (Pre) 1991]

Long radio waves are reflected by which of the following layer of Earth’s surface?

a) Tropopause

b) Ionosphere

c) Troposphere

d) Stratosphere

Answer: (b)

Question : 20 [UPPCS (Pre) 2012]

What is the use of thermostat?

a) To increase the temperature

b) To maintain the temperature

c) To measure the temperature

d) To convert heat into electricity

Answer: (b)

IMPORTANT general science mcq EXERCISES

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