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.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
A bound state describes a system where a particle is subject to a potential that the particle has a tendency to remain localized in one or more regions of space.
The kinetic energy is always positive because it is one half the mass times the speed squared
KE =
The mass is always positive and the square of the number is always positive. So KE is positive.
However potential energy can be either positive or negative. For example, the electrostatic PE of a proton and electron separated by a distance r is
PE =
where k is a positive number. So this potential energy is always negative. If the magnitude of the potential energy is larger than the kinetic energy, then total energy
E = PE + KE is negative.
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
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
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