ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

Momentum is a parameter associated with

Question # 2

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

Question # 3

Electromagnetic -radiation means:

Question # 4

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 5

Newton's law of motion do not hold in

Question # 6

Position was discovered by Carl Anderson in

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

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

Question # 9

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

Question # 10

The energy of a photon is represented by

Question # 11

Davision and Germer performed experiment to verify

Question # 12

At the temperature, a body emits radiation which is principally

Question # 13

Compton shift refers to:

Question # 14

The photon of radio-waves has energy of about

Question # 15

The Einstein's changes in length, mass and time are not observed in common life because

Question # 16

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 17

Wave nature of particle was proposed by

Question # 18

The nature of radiations emitted by a hot body depends upon its:

Question # 19

The special theory of relativity is based on:

Question # 20

The mass of an object will be doubled at speed

Question # 21

A photon is considered to have

Question # 22

The unit of work function is:

Question # 23

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

Question # 24

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

Question # 25

Absolute motion cannot be detected

Question # 26

There is no way to detect:

Question # 27

Practically the quantity v/c is always:

Question # 28

With the help of 50 K v electron microscope, a resolution of

Question # 29

A non-inertial frame of reference is one, in which

Question # 30

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
4 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
5 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
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 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
8 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
9 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
10 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev

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