Assertion:  Centre of mass of a system does not move under the action of internal forces. 

Reason: Internal forces are non conservative forces.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Total energy is negative for a bound
system.
Reason: Potential energy of a bound system is
negative and more than kinetic energy.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

In a cyclic process, work done by the system is

• zero

• more than the heat given to the system

• equal to heat given to the system

• independent of heat given to system

Ina cylinder their are 60 g Ne and 64 g O₂, If pressure of mixture of gases in cylinder is 30 bar then in this cylinder partial pressure of O₂ is (in bar)

• 30

• 20

• 15

• 12

15.

A gas mixture contain one mole O₂ gas and one mole He gas. Find the ratio of specific heat at constant pressure to that at constant volume of the gaseous mixture

• 2

• 1.5

• 2.5

• 4

One mole of oxygen of volume 1 litre at 4 atm pressure lo attains 1 atm pressure by result of isothermal expansion. Find work done by the gas.

• ≈ 155 J

• ≈ 206 J

• ≈ 355 J

• ≈ 552 J

Graph of specific heat at constant volume for a monoatomic gas is

Astronomical wavelength increase due to doppler effect known as

• Red shift

• Voilet shift

• UV

• IR shift

Which of the following is not a state function?

• Work-done in adiabatic process.

• Work done in isothermal process.

• Heat at constant pressure.

• Heat at constant volume.

A simple pendulum performs simple harmonic motion about x = 0 with an amplitude ' a ' and time period ' T '. The speed of the pendulum at x = a/2 will be

• $\frac{\mathrm{\pi } \mathrm{\alpha }}{\mathrm{T}}$

• $\frac{3 {\mathrm{\pi }}^2 \mathrm{a}}{\mathrm{T}}$

• $\frac{\mathrm{\pi } \mathrm{a}\sqrt{3}}{\mathrm{T}}$

• $\frac{\mathrm{\pi a} \sqrt{3}}{2\mathrm{T}}$