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

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

Question # 2

Converse of pair production is known as

Question # 3

When a platinum wire is heated, it appears white at

Question # 4

When platinum wire is heated, it appears cherry red at

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The Stephen-Boltzmann law for the black body radiation is given by

Question # 9

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 10

The special theory of relativity treats problems invoving

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 13

Newton's law of motion do not hold in

Question # 14

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

Question # 15

The photon of radio-waves has energy of about

Question # 16

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 17

Absolute motion cannot be detected

Question # 18

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

Question # 19

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

Question # 20

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 21

Intensity of light determines the:

Question # 22

The unit of work function is:

Question # 23

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 24

The special theory of relativity is based on:

Question # 25

As the light shines on the metal surface, the electrons are ejected

Question # 26

Wave nature of particle was proposed by

Question # 27

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

Question # 28

The energy of a photon is represented by

Question # 29

de-Broglies hypthesis was experimentally verified by

Question # 30

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
2 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
3 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
4 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
5 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
6 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
7 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
8 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
9 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
10 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr

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