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

Compton was awarded Nobel prize in physics in

Question # 2

A black body is

Question # 3

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 4

The positron was discovered by:

Question # 5

The general theory of relativity treats problems involving

Question # 6

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 7

Compton shift refers to:

Question # 8

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 9

Strictly speaking, the earth is:

Question # 10

S.I. unit of planks constant is

Question # 11

Momentum is a parameter associated with

Question # 12

When a platinum wire is heated, it appears white at

Question # 13

According to the special theory of relativity, time is

Question # 14

the symbol to be used in relativity problems denotes:

Question # 15

Position was discovered by Carl Anderson in

Question # 16

When a platinum wire is heated, it appears yellow at

Question # 17

According to the special theory of relativity, a moving clock

Question # 18

Photocell is a device which converts

Question # 19

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 20

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

Question # 21

The length contraction happens only

Question # 22

When platinum wire is heated, it appears cherry red at

Question # 23

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

Question # 24

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

Question # 25

The photon of radio-waves has energy of about

Question # 26

The value of threshold frequency for different metals is

Question # 27

Electromagnetic -radiation means:

Question # 28

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

Question # 29

The concept of direction is purely:

Question # 30

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
2 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
3 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
4 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
5 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
6 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
7 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
8 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
9 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
10 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

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