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

Victor de-Brogile received the Nobel prize in physics in

Question # 2

Electromagnetic -radiation means:

Question # 3

The concept of direction and position are purely

Question # 4

In photoelectric effect the energy of ejected electrons depend on

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

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

Question # 7

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

Question # 8

When a platinum wire is heated, it appears yellow at

Question # 9

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 # 10

The value of threshold frequency for different metals is

Question # 11

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 # 12

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 13

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 14

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

Question # 15

Compton shift refers to:

Question # 16

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

Question # 17

The general theory of relativity treats problems involving

Question # 18

When the atomic particle are moving with velocities approaching that of light:

Question # 19

The special theory of relativity is based on:

Question # 20

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

Question # 21

As the light shines on the metal surface, the electrons are ejected

Question # 22

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

Question # 23

The idea of quantization of energy was proposed by:

Question # 24

There is no way to detect:

Question # 25

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

Question # 26

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

Question # 27

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 28

Which of the following phenomenon proves the particle nature of light

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
2 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
3 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
4 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
5 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
6 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
7 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
8 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
9 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
10 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935

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