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

Which one of the following physical quantities changes with relativistic speed

Question # 2

A particle having mass and charge equal to that of an electron is called:

Question # 3

The year when A.H. compton was awarded Nobel Prize is:

Question # 4

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

Question # 5

The nature of radiations emitted by a hot body depends upon its:

Question # 6

The length contraction happens only

Question # 7

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

Question # 8

Which of the following phenomenon proves the particle nature of light

Question # 9

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

Question # 10

The photon of radio-waves has energy of about

Question # 11

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

Question # 12

Momentum is a parameter associated with

Question # 13

The value of the plank's constant 'h' is given by

Question # 14

When a platinum wire is heated, it appears yellow at

Question # 15

The mass of an object will be doubled at speed

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
2 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
3 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
4 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
5 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
8 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
9 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
10 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson

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