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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

The special theory of relativity is based on:

Question # 3

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 4

Which of the following phenomenon proves the particle nature of light

Question # 5

Davision and Germer performed experiment to verify

Question # 6

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

Question # 7

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

Question # 8

0.1 kg mass will be equivalent to the energy

Question # 9

The energy of photon 'E' is proported to

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

The general theory of relativity treats problems involving

Question # 12

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

Question # 13

the symbol to be used in relativity problems denotes:

Question # 14

Victor de-Brogile received the Nobel prize in physics in

Question # 15

Position was discovered by Carl Anderson in

Question # 16

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

Question # 17

de-Broglies hypthesis was experimentally verified by

Question # 18

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

Question # 19

Photocell is a device which converts

Question # 20

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 21

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

Question # 22

Strictly speaking, the earth is:

Question # 23

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 24

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

Question # 25

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

Question # 26

Compton shift refers to:

Question # 27

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 28

The energy of a photon is represented by

Question # 29

Compton was awarded Nobel prize in physics in

Question # 30

The value of the Stephen's constant for black body radiations is given by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
2 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
3 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
4 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
5 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
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 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
8 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
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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