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

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

Question # 2

Position was discovered by Carl Anderson in

Question # 3

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 4

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

Question # 5

Photocell is a device which converts

Question # 6

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 7

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 8

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

Question # 9

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

Question # 10

The special theory of relativity treats problems invoving

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Strictly speaking, the earth is:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
2 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
3 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
4 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
5 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
6 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
7 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
8 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
9 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
10 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927

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