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 unit of work function is:

Question # 2

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

Question # 3

The existence of position was predicted by Dirace in

Question # 4

Intensity of light determines the:

Question # 5

According to the special theory of relativity, time is

Question # 6

S.I. unit of planks constant is

Question # 7

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 8

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 9

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 10

Compton was awarded Nobel prize in physics in

Question # 11

Which of the following phenomenon proves the particle nature of light

Question # 12

The energy of a photon is represented by

Question # 13

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 14

The concept of direction is purely:

Question # 15

the dilation of time applies to the timing processes which are:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
2 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
3 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
4 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
5 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
6 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
7 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
8 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
9 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
10 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)

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