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8. A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

(a) Hydrogen (b) Helium

(c) Nitrogen (d) Argon

Ans. d

(8)

5/5 - (1 vote)

PrevPreviousAssertion : Comets move around the sun in elliptical orbits. The gravitational force on the comet due to sun is not normal to the comet’s velocity but the work done by the gravitational force over every complete orbit of the comet is zero. Reason : Gravitational force is a non conservative force.

NextAssertion : The work done during a round trip is always zero. Reason : No force is required to move a body in its round trip.Next

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