ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 2

Due to relative motion of observer and the frame of reference of events, time always:

Question # 3

The special theory of relativity is based on the

Question # 4

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 5

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 6

Pair production is the phenomenon in which

Question # 7

When the atomic particle are moving with velocities approaching that of light:

Question # 8

Newton's law of motion do not hold in

Question # 9

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 10

The inside cavity of the black body is

Question # 11

The concept of direction is purely:

Question # 12

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 13

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 14

When a platinum wire is heated, it appears white at

Question # 15

If a material object moves with the speed of light 'C' its mass becomes

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
2 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
3 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
4 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
5 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
8 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
9 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0

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