ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

de-Broglies hypthesis was experimentally verified by

Question # 2

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

An intertial frame of reference is a frame of reference which is

Question # 4

The energy of a photon is represented by

Question # 5

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

Question # 6

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 # 7

The photon of radio-waves has energy of about

Question # 8

When a platinum wire is heated, it appears orange red at

Question # 9

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 10

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

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

Question # 13

The energy of photon 'E' is proported to

Question # 14

Photoelectrons are emitted when ultraviolet light falls on:

Question # 15

The special theory of relativity is based on the

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
2 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
3 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
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 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 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
7 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
8 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
9 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
10 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

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