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

Which of the following is not an example of intertial frame

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

In photoelectric effect the energy of ejected electrons depend on

Question # 4

According to the special theory of relativity

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 9

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

Question # 10

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 11

Electromagnetic -radiation means:

Question # 12

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

Question # 13

From the theory of relativity, momentum p of the photon is related to energy as

Question # 14

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

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
2 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (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 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
7 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
8 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
9 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s

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