(b) to prevent thermal radiation
(c) to keep cool the engine
(d) None of these
Ans: (c)
234. The device to record and to reproduce the detection of the recording is
called: [RRB ASM/GG 2004]
(a) Audio phone
(b) Detectophone
(c) Gramophone
(d) Microphone
Ans: (c)
235. The law of floatation was invented by : [RRB Disel Assit. 2002]
(a) Newton
(b) Wright Brothers
(c) Galileo
(d) Archemedes
Ans: (d)
236. ln isobaric and isochoric thermo dynamical processes:
(a) pressure and volume remain constant
(b) volume and pressure remain constant
(c) pressure and temperature remain constant
(d) None of these
Ans: (a)
237. ln the adiabatic process, which one of the following remains constant:
(a) heat
(b) entropy
(c) Both of these
(d) None of these
Ans: (c)
238. ln the ideal gas which type of energy is absent:
(a) Kinetic energy
(b) Potential energy
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