ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

Electromagnetic radiation or photons interact with matter in

Question # 3

Practically the quantity v/c is always:

Question # 4

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 5

There is no way to detect:

Question # 6

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 7

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

Question # 8

If a material object moves with the speed of light 'C' its mass becomes

Question # 9

Compton was awarded Nobel prize in physics in

Question # 10

The value of threshold frequency for different metals is

Question # 11

Photoelectrons are emitted when ultraviolet light falls on:

Question # 12

Converse of pair production is known as

Question # 13

The concept of direction is purely:

Question # 14

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 15

Compton studied the scattering of x-rays by loosely bound electrons from:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
3 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
4 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
5 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 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
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 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
10 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these

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