ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Converse of pair production is known as

Question # 2

The inside cavity of the black body is

Question # 3

According to the special theory of relativity, time is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 8

Wien's constant is measured in:

Question # 9

the dilation of time applies to the timing processes which are:

Question # 10

Due to relative motion of observer and the frame of reference of events, time always:

Question # 11

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

Question # 12

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

Question # 13

Victor de-Brogile received the Nobel prize in physics in

Question # 14

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

Question # 15

An inertial frame is that frame in which

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
2 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
3 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
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 general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
8 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
9 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
10 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

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