ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

The special theory of relativity is based on:

Question # 2

A photon is considered to have

Question # 3

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 4

the symbol to be used in relativity problems denotes:

Question # 5

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 6

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

Question # 7

The photon of radio-waves has energy of about

Question # 8

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

Question # 9

Which of the following is not an example of intertial frame

Question # 10

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

Question # 11

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 12

When a platinum wire is heated, it appears yellow at

Question # 13

There is no way to detect:

Question # 14

The general theory of relativity treats problems involving

Question # 15

When a position comes close to an electron they annihilate into photons such that

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
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 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
6 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
7 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
8 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
9 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
10 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932

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