ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

Which of the following phenomenon proves the particle nature of light

Question # 2

An intertial frame of reference is a frame of reference which is

Question # 3

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 4

The energy of a photon is represented by

Question # 5

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

Question # 6

From the theory of relativity, momentum p of the photon is related to energy as

Question # 7

Photoelectric effect takes place with a photon of:

Question # 8

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 9

The photon of radio-waves has energy of about

Question # 10

There is no way to detect:

Question # 11

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

Question # 12

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 13

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 14

Wave nature of particle was proposed by

Question # 15

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 16

When a position comes close to an electron they annihilate into

Question # 17

S.I. unit of planks constant is

Question # 18

Intensity of light determines the:

Question # 19

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

Question # 20

Wien's constant is measured in:

Question # 21

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

Question # 22

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

Question # 23

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 24

The positron was discovered by:

Question # 25

The special theory of relativity treats problems invoving

Question # 26

Absolute motion cannot be detected

Question # 27

Photoelectrons are emitted when ultraviolet light falls on:

Question # 28

Electromagnetic radiation or photons interact with matter in

Question # 29

The idea of quantization of energy was proposed by:

Question # 30

In photoelectric effect the energy of ejected electrons depend on

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
4 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
5 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
6 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
7 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
8 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
9 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
10 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume

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