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

00:00
Question # 1

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 2

Position was discovered by Carl Anderson in

Question # 3

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

Question # 4

Which of the following phenomenon proves the particle nature of light

Question # 5

A particle having mass and charge equal to that of an electron is called:

Question # 6

According to the special theory of relativity, time is

Question # 7

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

Question # 8

The value of the Stephen's constant for black body radiations is given by

Question # 9

Wien's constant is measured in:

Question # 10

The concept of direction and position are purely

Question # 11

Photocell is a device which converts

Question # 12

Compton was awarded Nobel prize in physics in

Question # 13

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

Question # 14

Wave nature of particle was proposed by

Question # 15

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

Question # 16

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 17

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

Question # 18

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

Question # 19

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 20

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:

Question # 21

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 22

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

Question # 23

According to the special theory of relativity

Question # 24

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 25

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

Question # 26

A photon is considered to have

Question # 27

Strictly speaking, the earth is:

Question # 28

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

Question # 29

Intensity of light determines the:

Question # 30

The value of threshold frequency for different metals is

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ECAT 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 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
3 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)
4 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
5 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
6 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
7 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
8 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
9 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
10 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

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