TRB Physics Previous Year Question Papers Pdf - 5

Question: 21

Identity the paramagnetic substance

(A) Aluminium

(B) Nickel

(C) Iron

(D) Copper

Ans: A

Aluminium

Question: 22

Who developed the hydrogen bomb?

(A) Samual Cohen

(B) Adberd Taylor

(C) J. Robert Opan Heemar

(D) Bernor Bon Bron

Ans: C

J. Robert Opan Heemar

Question: 23

The velocity of sound in air (vacuum) is

(A) 110 m/sec

(B) 220 m/sec

(C) 232 m/sec

(D) 330 m/sec

Ans: D

330 m/sec

Question: 24

Ventilators are provided at the top of room

(A) to bring oxygen for breathing

(B) so that sunlight may enter the room

(C) to provide an outlet for carbon dioxide

(D) to maintain conventional currents to keep the air fresh in the room

Ans: D

to maintain conventional currents to keep the air fresh in the room

Question: 25

The instrument used to measure the temperature of the source from its thermal radiation is

(A) Pyrometer

(B) Thermopile

(C) Hydrometer

(D) Barometer

Ans: B

Thermopile

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