Physics - Questions and Answers, General Study (GK)

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Physics - Questions and AnswersPage 24

231.

Which of the following is the example of ideal black body?

(a)Black board

(b)Kajal

(c)A pin hole box

(d)None of these

Comment

Answer is: CNA

232.

The temperature of water at the bottom of a waterfall is higher than that at the top because

(a)water at the bottom has greater potential energy

(b)the surface at the bottom provides heat

(c)kinetic energy of falling water is converted into heat

(d)falling water absorbs heat from the surroundings

Comment

Answer is: CNA

233.

Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of

(a)convection only

(b)conduction and convection only

(c)radiation and convection only

(d)convection, conduction and radiation

Comment

Answer is: CNA

234.

How can boiling point of a liquid be reduced?

(a)By adding a solid of lower melting point

(b)By dissolving a soluble solid in it

(c)By increasing the pressure on the liquid

(d)By decreasing the pressure on the liquid

Comment

Answer is: DNA

235.

Which one of the following is true for the flow of water from high level to low (at constant temperature and pressure)?

(a)G = 0

(b)G = 1

(c)G < 0

(d)G = -1

Comment

Answer is: CNA

236.

The speed of light with the rise in the temperature of the medium

(a)increases

(b)decreases

(c)remains unaltered

(d)drops suddenly

Comment

Answer is: CNA

237.

Night are cooler in the deserts than in the plains because

(a)sand radiates heat more quickly than the earth

(b)the sky remain clear most of the time

(c)sand absorbs heat quickly than the earth

(d)None of the above

Comment

Answer is: ANA

238.

Clothes keep us warm in winter because they

(a)supply heat

(b)do not radiate heat

(c)prevent air from contacting the body

(d)prevent the heat of the body from escaping

Comment

Answer is: DNA

239.

The best conductor of heat among the following is

(a)alcohol

(b) mercury

(c)ether

(d)water

Comment

Answer is: BNA

240.

Clear night are colder than cloudy nights because of

(a)conduction

(b)condensation

(c)radiation

(d)insulation

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 24

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