A container has N molecules at absolute temperature T. If the number of molecules is doubled but kinetic energy in the box remains the same, the absolute temperature of the gas is:

(A) T

(B)2 T_{}

(C)^{T}/_{2}

(D)Zero

Question-2

A vessel contains 1 mole of O_{2} gas (molar mass 32) at temperature T. The pressure of the gas is P. An identical vessel containing one mole of He (molar mass 4) at a temperature 2T has a pressure of

(A)^{p}/_{8}

(B)p

(C)8 p

(D)2 p

Question-3

The r.m.s velocity of nitrogen molecules at N.T.P is:

(A) 33 m/s

(B)493 m/s

(C)517 m/s

(D)546 m/s

Question-4

A pendulum clock consists of an iron rod connected to a small, heavy bob. If it is designed to keep correct time at 20^{o} C, how fast or slow will it go in 24 h at 40^{o} C.

(A) 10.4 s

(B)10.72 s

(C)10.68 s

(D)10.9 s

Question-5

The coefficient of apparent expansion of a liquid in a copper vessel is C and in a silver vessel is S. The coefficient of volume expansion is . The coefficient of linear expansion of silver will be :

(A)

(B)

(C)

(D)

Question-6

A piston of cross-section area A is fitted in cylinder in which gas of volume V at pressure P is enclosed. Gas obeys Boyle's law, the angular frequency if piston is displaced slightly, is :

(A)

(B)

(C)

(D)

Question-7

A pendulum clock keeps correct time at 0^{o }C. If the coefficient of linear expansion is, then what will be the loss in time per day, when the temperature rises by to C ?

(A)

(B)

(C)

(D)

Question-8

A cylinder contains 10 kg of gas at a pressure of 10^{7} N/m^{2} . The quantity taken out of the cylinder if the final pressure is . (temperature of gas is constant) is

(A) 7.5 kg

(B)Zero

(C)9.5 kg

(D)14.2 kg

Question-9

If an oxygen atom and hydrogen atom are having the same temperature, then ratio of their average kinetic energy is

(A) 1 : 1

(B)2 : 1

(C)4 : 1

(D)1 : 4

Question-10

The figure below shows the plot of versus P for oxygen gas at two different temperatures.

Read the following statements concerning the above curves : (i) The dotted line corresponds to the 'ideal gas' behaviour. (ii) T_{1} > T_{2} (iii) The value of at the point where the curves meet on the y-axis is the same for all gases. Which of the above statement is true ?

(A) (i) only

(B)(i) and (ii) only

(C)All of these

(D)None of these

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