If the pressure in a closed vessel introduced by drawing out some gas the mean free bath of the molecules

• Is decreased

• Is increased

• Remains unchanged

• Increases or decreases according to the nature of the gas

The temperature at which the horams speed of hydrogen molecules is equal to escape velocity on earth surface will be

• 1060k

• 5030k

• 8270k

• 10063k

Volume versus temperature graph of 2 moles of helium gas is as shown his figure the radio of heat observed and the walk done by the gas in process 1_ 2 is

• 3

• 5/2

• 5/3

• 7/2

The molar heat capacity in a process of gas if it does a work of when heat of Q/

4 is supplied to it is

• 2/5R

• 5/2R

• 10/3R

• 6/7R

Figures shows the variation in temperature ∆ T with amount of heat supplied (Q )in an isobric process corresponding to one mole of each a monotomic diatomic and me gas the initial state of all gases or the same and the scale for this to access considered ignoring vibrational degrees of freedom the line ab and C respectively correspond to

• M, d and p

• D, m and p

• P, d and m

• P, m and d

The internal energy of an ideal gas increase during and isothermal process when the gas in

• Expanded by by adding more molecules to it

• Expanded by adding more heat to it

• Expanded against zero pressure

• Compressed by doing doing work on it

The efficiency of carnet engine is 0.6 it's rejects 20j of heat to the sink the work done by the en gine is

• 20j

• 30j

• 35.5

• 50j

A particle of mass 1 kg is undergoing SHM for which graph between force and displacement from me position is shown its time period in second is

• π/3

• 2π/3

• π/6

• 3/π

A light spiral spring support s 200 gm weight at its lower end it oscillates up and down with the period of 1 sec how much weight gram must be removed from the lower end to reduce the period 20.5 sec

• 200

• 150

• 53

• 100

That time period of a symbol pendulum is 2 second if it is length is increased 4 times then its period becomes

• 16 sec

• 12 sec

• 8 sec

• 4 sec