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

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

Question # 2

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

Question # 3

Electromagnetic radiation or photons interact with matter in

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

The special theory of relatively treats the problems involving:

Question # 6

Photoelectrons are emitted when ultraviolet light falls on:

Question # 7

When the atomic particle are moving with velocities approaching that of light:

Question # 8

0.1 kg mass will be equivalent to the energy

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The general theory of relativity treats problems involving

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

Converse of pair production is known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
2 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
4 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
6 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
7 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
8 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
9 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
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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