ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

In photoelectric effect the energy of ejected electrons depend on

Question # 2

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 3

Compton shift refers to:

Question # 4

Compton was awarded Nobel prize in physics in

Question # 5

the symbol to be used in relativity problems denotes:

Question # 6

Momentum is a parameter associated with

Question # 7

Victor de-Brogile received the Nobel prize in physics in

Question # 8

Wien's constant is measured in:

Question # 9

The length contraction happens only

Question # 10

Wave nature of particle was proposed by

Question # 11

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

Question # 12

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 13

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

Question # 14

In order to produce pair production, a photon must have a energy

Question # 15

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
3 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
4 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
7 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
8 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
9 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
10 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these

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