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

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

Question # 2

From the theory of relativity, momentum p of the photon is related to energy as

Question # 3

In photoelectric effect the energy of ejected electrons depend on

Question # 4

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

Question # 5

Wave nature of particle was proposed by

Question # 6

The energy of photon 'E' is proported to

Question # 7

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 # 8

An intertial frame of reference is a frame of reference which is

Question # 9

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 10

Photocell is a device which converts

Question # 11

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

Question # 12

When a position comes close to an electron they annihilate into

Question # 13

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 14

According to the Max plank, energy is redialed or absorbed in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
2 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
3 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
4 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
6 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
7 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
8 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
9 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
10 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above

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