ACADEMY FOR EXCELLENCE
Physics 2nd year
Time:30min Total
marks:20
Identify
the correct answer from the following
1.
An inertial frame of reference is
one which
(a)
moves with uniform velocity
(b)
is at rest
(c)
has zero acceleration
(d)
has all of the above
2. Relativistic effects of
changes in the values of mass, length and time are observed when
(a) 
= 1 (b) < 1
= 1 (b) < 1
(c) > 1 (d) none of these
> 1 (d) none of these
3. Photoelectric effect is
the conversion of
(a) light into heat (b)
electricity into light
(c) light into electricity (d)
light into heat
4. A metal is illuminated
by light above its threshold frequency. Which determines the number of
photoelectrons emitted by the metal?
(a) Colour (b)
Frequency
(c) Intensity (d) Wavelength
5. Wave theory of light
cannot explain the phenomenon of
(a) Interference (b)
Diffraction
(c) Polarization (d)
Photoelectric effect
Short
Questions:
1. Will high frequency
light eject greater number of electrons than low frequency light?
2. Write the
difference between general theory of relativity and special theory of
relativity.
3. Write Planck’s
Assumption about radiations.
4. Describe Pair
Production.
Long Question:
a. Write a note on
Compton Effect.
b. A square coil of
side 16 cm has 200 turns and rotates in a uniform magnetic field of magnitude
0.05 T. If the peak emf is 12 volt. What is the angular velocity of the coil?
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