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

A non-inertial frame of reference is one, in which

Question # 2

When a platinum wire is heated, it appears yellow at

Question # 3

The existence of position was predicted by Dirace in

Question # 4

Absolute motion cannot be detected

Question # 5

the symbol to be used in relativity problems denotes:

Question # 6

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

Question # 7

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 8

A photon is considered to have

Question # 9

Photoelectric effect takes place with a photon of:

Question # 10

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 11

Strictly speaking, the earth is:

Question # 12

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

Question # 13

Which one of the following physical quantities changes with relativistic speed

Question # 14

The energy of photon 'E' is proported to

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
2 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
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 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
5 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
6 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
7 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
8 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
9 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
10 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these

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