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

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

Question # 2

Photocell is a device which converts

Question # 3

Compton was awarded Nobel prize in physics in

Question # 4

The idea of quantization of energy was proposed by:

Question # 5

The special theory of relativity treats problems invoving

Question # 6

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

Question # 7

Newton's law of motion do not hold in

Question # 8

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

A photon is considered to have

Question # 12

Wave nature of particle was proposed by

Question # 13

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

Question # 14

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

Question # 15

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
3 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
4 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
5 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
6 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
7 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
8 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
9 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
10 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them

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