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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