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

A photon is considered to have

Question # 2

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

Question # 3

The Einstein's changes in length, mass and time are not observed in common life because

Question # 4

The length contraction happens only

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

The inside cavity of the black body is

Question # 7

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

Question # 8

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

Question # 9

The general theory of relativity treats problems involving

Question # 10

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

Question # 11

The energy of photon 'E' is proported to

Question # 12

The unit of work function is:

Question # 13

de-Broglies hypthesis was experimentally verified by

Question # 14

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

Question # 15

When platinum wire is heated, it appears cherry red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
2 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
4 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
5 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
6 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
7 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
8 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
9 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
10 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well

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