ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The energy of the 4th orbit in hydrogen atom is

Question # 2

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 # 3

Wave nature of particle was proposed by

Question # 4

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

Question # 5

Converse of pair production is known as

Question # 6

Davision and Germer performed experiment to verify

Question # 7

The existence of position was predicted by Dirace in

Question # 8

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 # 9

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

Question # 10

The value of threshold frequency for different metals is

Question # 11

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

Question # 12

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 13

A photon is considered to have

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
2 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
3 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
4 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
6 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
8 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
9 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935

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