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

Try The 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

If a material object moves with the speed of light 'C' its mass becomes

Question # 2

The length contraction happens only

Question # 3

Strictly speaking, the earth is:

Question # 4

The inside cavity of the black body is

Question # 5

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

Question # 6

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

Question # 7

Momentum is a parameter associated with

Question # 8

The existence of position was predicted by Dirace in

Question # 9

Due to relative motion of observer and the frame of reference of events, time always:

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

The concept of direction is purely:

Question # 12

According to the Max plank, energy is redialed or absorbed in

Question # 13

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

Question # 14

The value of the plank's constant 'h' is given by

Question # 15

The value of threshold frequency for different metals is

Question # 16

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

Question # 17

According to the special theory of relativity, a moving clock

Question # 18

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

The year when A.H. compton was awarded Nobel Prize is:

Question # 23

Converse of pair production is known as

Question # 24

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 25

The idea of quantization of energy was proposed by:

Question # 26

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

An inertial frame is that frame in which

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
3 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
4 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
5 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
6 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
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 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
9 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
10 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

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