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

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

Question # 2

Strictly speaking, the earth is:

Question # 3

The special theory of relativity is based on:

Question # 4

The energy of photon 'E' is proported to

Question # 5

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

In photoelectric effect the energy of ejected electrons depend on

Question # 8

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 9

Compton shift refers to:

Question # 10

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 11

Newton's law of motion do not hold in

Question # 12

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

Question # 13

The mass of an object will be doubled at speed

Question # 14

The existence of position was predicted by Dirace in

Question # 15

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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)
2 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
3 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
4 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
5 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
6 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
7 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
8 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
9 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
10 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

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