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

Newton's law of motion do not hold in

Question # 2

A photon is considered to have

Question # 3

The value of the Stephen's constant for black body radiations is given by

Question # 4

Electromagnetic -radiation means:

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

0.1 kg mass will be equivalent to the energy

Question # 7

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

Question # 8

S.I. unit of planks constant is

Question # 9

The Stephen-Boltzmann law for the black body radiation is given by

Question # 10

Which one of the following physical quantities changes with relativistic speed

Question # 11

A black body is

Question # 12

According to the special theory of relativity, time is

Question # 13

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

Question # 14

The special theory of relativity is based on the

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
2 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
3 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
4 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
5 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
6 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
7 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
8 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
9 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
10 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate

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