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

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

Question # 2

The inside cavity of the black body is

Question # 3

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 4

de-Broglies hypthesis was experimentally verified by

Question # 5

With the help of 50 K v electron microscope, a resolution of

Question # 6

Converse of pair production is known as

Question # 7

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 # 8

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 9

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 10

The energy of a photon is represented by

Question # 11

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

Question # 12

According to the Max plank, energy is redialed or absorbed in

Question # 13

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

Question # 14

The energy of photon 'E' is proported to

Question # 15

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
4 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
5 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
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
10 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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