DBRAU Kanpur BSc III relativity & Statistical Physics Paper 2022
| S.No. | Questions with options |
| 1 | The hypothesis of equal-a-priori probability for an isolated physical system, tells that
(a) All the microstates of a macrostate are equally probable (b) The macrostate of mean energy is most probable (c) The state of lowest energy is most probable (d) None of these |
| 2 | According to Gallilian invariance, the law of conservation of momentum states that if some particles collide with each other, then their total liner momentum before and after the collision, remains the same when the collision is
(a) Only the elastic (b) Only the inelastic (c) Both elastic and inelastic (d) Nothing can be said |
| 3 | The correct transformations connecting the two inertial frames are
(a) Gallilean (b) Lorentz (c) Newtonian (d) None of these |
| 4 | A clock is moving with a velocity C/3. It will appear to go slow in one hour by
(a) 3 minutes (b) 3.7 minutes (c) 3.7 sec (d) Zero |
| 5 | What is the rest energy of one electron?
(a) 9.40 MeV (b) 940.8 MeV (c) 0.51 MeV (d) 10.2 MeV |
| 6 | The laws of Newton are applicable
(a) In rotatory frame (b) In inertial frame (c) In non-inertial frame (d) In accelerated frame |
| 7 | The maximum velocity of a material particle can be
(a) Less than the speed of light (b) Equal to the speed of light (c) More than the speed of light (d) Equal to the speed of sound |
| 8 | In the Compton scattering, the increase in wavelength depends on
(a) The wavelength of the incident radiation (b) Nature of scatterer (c) Angle of scattering (d) None of the above |
| 9 | S is the inertial frame. The other frame S’ is moving relative to S with a constant velocity. The frame S’ is
(a) Inertial (b) Non-inertial (c) Accelerated frame (d) None of these |
| 10 | In a Canonical ensemble, the quantities same for each system are
(a) Temperature, volume and the number of particles (b) Energy, volume and the number of particles (c) Only energy (d) Only volume and the number of particle |
| 11 | An electron annihilates with a positron. What is the energy of photon produced?
(a) 1.02 MeV (b) 10.2 MeV (c) 0.51 MeV (d) 5.01 MeV |
| 12 | Three identical dice A,B and C each with six faces are simultaneously tossed. The probability of getting the same number upper-most in each dice is
(a) 1/36 (b) 1/216 (c) 1/18 (d) 1/72 |
| 13 | According to the Maxell’s law of distribution of velocities, the number of molecules corresponding to the most probable velocity is
(a) Quite small (b) Very large (c) Zero (d) Only one |
| 14 | According to Maxell’s law of distribution of speeds, the number of molecules corresponding to zero speed is
(a) Maximum (b) Zero (c) Infinite (d) Proportional to absolute temperature |
| 15 | The kinetic Energy of molecule of a gas is zero at
(a) Zero degree Celsius (b) -273 degree Celsius (c) 273 degree Celsius (d) 273 Kelvin |
| 16 | At a temperature -273 degree Celsius, the speed of molecule of gas is
(a) Maximum (b) Minimum (c) Zero (d) Infinite |
| 17 | Most sharp spectral line will be of
(a) Hydrogen (b) Oxygen (c) Cadmium (d) Mercury |
| 18 | Most probable energy of molecule is
(a) kT/2 (b) kT (c) 3kT/2 (d) Infinity |
| 19 | The particles obeying Maxwell’s Boltzmann statistics are
(a) Electrons (b) Protons (c) Photons (d) Gas- molecule |
| 20 | The particles in a system obeying the Maxwell-Boltzmann statistics are
(a) Identical but distinguishable (b) Identical and indistinguishable (c) Only identical (d) Only indistinguishable |
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