DSSSB PGT Physics Teacher Tier II Paper 2014

DSSSB PGT Physics Teacher Tier II Paper 2014

For a diatomic ideal gas near room temperature, what fraction of the heat supplied is available for external work if the gas is expanded at constant pressure ?
(a) 1/7
(b) 5/7
(c) 3/4
(d) 2/7

In how many ways two particles can be arranged in three phase cells according to Bose-Eintein statistics ?
(a) 6
(b) 9
(c) 3
(d) 27

The number of most probable thermodynamic macrostates for a system having odd number of particles is
(a) 1
(b) 2
(c) 3
(d) 4

The mass defect for the nucleus of Helium is 0.03 a.m.u. What is the binding energy per nucelon for helium in MeV ?
(a) 28
(b) 7
(c) 16
(d) 4

Atomic mass number of an element is 232 and its atomic number is 90. The end product of this radioactive element is an isotope of lead (atomic mass 208 and atomic number 82). The number of alpha and beta particles emitted are
(a) 4 alpha & 6 beta
(b) 6 alpha only
(c) 6 alpha & 4 beta
(d) 3 alpha & 3 beta

According to Louis de Broglie’s hypothesis, the momentum of an electron confined to the interval (0,a) along x-axis can have discrete values given by (‘n’ is a positive integer in the following) –
(a) P = nh/a
(b) P = na/h
(c) P = nh/2a
(d) 2na/h

A particle is trapped in an infinite potential energy well. It is in the state with quantum number n=14. How many maxima does the probability density have ?
(a) 7
(b) 13
(c) 14
(d) 21

The ground state energy of an electron in a one-dimensional box
(a) is zero
(b) decreases with temperature
(c) increases with temperature
(d) is independent of temperature

In compton scattering from electrons, the largest change in wavelength occurs when the photon is scattered throguh an angle
(a) 0 degree
(b) 45 degree
(c) 90 degree
(d) 180 degree

In a photoelectric effect experiment at a frequency above cut off, the number of electrons ejected is propotional to
(a) Their kinetic energy
(b) The work function
(c) Frequency of the incident light
(d) Intensity of light

The quantisation of energy E=nhf, is not important for an ordinary pendulum because
(a) The formula applies only to mass-spring oscillators
(b) The allowed energy levels are too closely spaced
(c) The allowed energy levels are too widely spaced
(d) The formula applies only to atoms

The dimension of the planck constant ‘h’ are that of
(a) Energy
(b) Power
(c) Momentum
(d) Angular momentum

In a Helium-Neon laser, the laser transition takes place in
(a) He atoms only
(b) Ne atoms only
(c) Either He or Ne atoms
(d) Both He and Ne atoms

In a certain region of a thin film we get 6 interference fringes with light of wavelength 500 nm. How many fringes do we get in the same region with wavelength 600 nm?
(a) 6
(b) 5
(c) 30
(d) 36

In Young’s double slit experiment, the separation between the slits is halved and the distance between the slits and screen is doubled. The fringe width is
(a) Unchanged
(b) Halved
(c) Doubled
(d) Quadrupled