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 Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 2

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 3

Photocell is a device which converts

Question # 4

Which of the following phenomenon proves the particle nature of light

Question # 5

A photon is considered to have

Question # 6

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 7

Pair production is the phenomenon in which

Question # 8

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 9

In photoelectric effect the energy of ejected electrons depend on

Question # 10

Converse of pair production is known as

Question # 11

Photoelectrons are emitted when ultraviolet light falls on:

Question # 12

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 13

Strictly speaking, the earth is:

Question # 14

Victor de-Brogile received the Nobel prize in physics in

Question # 15

the symbol to be used in relativity problems denotes:

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
2 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
3 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
4 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
5 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
6 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
7 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
8 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
9 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
10 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these

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