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

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

Question # 2

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

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

According to the special theory of relativity

Question # 5

Electromagnetic radiation or photons interact with matter in

Question # 6

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

Question # 7

The unit of work function is:

Question # 8

When a platinum wire is heated, it appears orange red at

Question # 9

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 10

The special theory of relatively treats the problems involving:

Question # 11

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

Question # 12

Position was discovered by Carl Anderson in

Question # 13

Which one of the following physical quantities changes with relativistic speed

Question # 14

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

Question # 15

The value of the plank's constant 'h' is given by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
2 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
3 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
4 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
5 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
6 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
7 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
8 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
9 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
10 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these

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