# PG TRB Physics Previous Year Questions with Answer Key - 1

Question: 1

Sound cannot travel though

(A) Vacuum

(B) Solids

(C) Liquids

(D) Gases

Ans: A

Vacuum

Question: 2

Water changes into steam by absorbing ____ calories of heat per gram of water at 100°C.

(A) 427

(B) 537

(C) 79

(D) 125

Ans: B

537

Question: 3

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of

(A) Cannot be heated in the absence of gravity

(C) Convection

(D) Conduction

Ans: B

Question: 4

A ray of light travels from water to air. If the angle of incidence is 40°, then the angle of refraction is

(A) equal to zero

(B) greater than 40°C

(C) less than 40°C but not zero

(D) 40°C

Ans: B

greater than 40°C

Question: 5

Copper wires are generally used for electrical power transmission instead of iron wires because

(A) copper can take higher power than iron

(B) copper is lighter than iron

(C) copper is cheaper than iron

(D) copper is a better conductor than iron

Ans: A

copper can take higher power than iron

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