ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

The positron was discovered by:

Question # 3

An intertial frame of reference is a frame of reference which is

Question # 4

An inertial frame is that frame in which

Question # 5

The nature of radiations emitted by a hot body depends upon its:

Question # 6

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

Question # 7

Photocell is a device which converts

Question # 8

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 9

The photon of radio-waves has energy of about

Question # 10

The special theory of relativity is based on the

Question # 11

The inside cavity of the black body is

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

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

Question # 14

At the temperature, a body emits radiation which is principally

Question # 15

When a platinum wire is heated, it appears dull red at about

Question # 16

In order to produce pair production, a photon must have a energy

Question # 17

The energy of a photon is represented by

Question # 18

In photoelectric effect the energy of ejected electrons depend on

Question # 19

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

Question # 20

Which one of the following physical quantities changes with relativistic speed

Question # 21

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

Question # 22

The concept of direction is purely:

Question # 23

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

Question # 24

The existence of position was predicted by Dirace in

Question # 25

According to the special theory of relativity

Question # 26

the dilation of time applies to the timing processes which are:

Question # 27

Pair production is the phenomenon in which

Question # 28

the symbol to be used in relativity problems denotes:

Question # 29

Absolute motion cannot be detected

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
3 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
4 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
5 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
8 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
9 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
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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