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

Wave nature of particle was proposed by

Question # 2

The unit of work function is:

Question # 3

The photon of radio-waves has energy of about

Question # 4

The concept of direction and position are purely

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

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

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

In photoelectric effect the energy of ejected electrons depend on

Question # 9

When a position comes close to an electron they annihilate into

Question # 10

When a platinum wire is heated, it appears yellow at

Question # 11

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

Question # 12

According to the special theory of relativity

Question # 13

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

Question # 14

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 15

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
2 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
3 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
4 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
6 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
7 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
8 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)
9 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
10 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion

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