ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

Absolute motion cannot be detected

Question # 3

Due to relative motion of observer and the frame of reference of events, time always:

Question # 4

According to the special theory of relativity, a moving clock

Question # 5

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

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

Position was discovered by Carl Anderson 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 mass of an object will be doubled at speed

Question # 10

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

Question # 11

Wave nature of particle was proposed by

Question # 12

Photoelectrons are emitted when ultraviolet light falls on:

Question # 13

Converse of pair production is known as

Question # 14

When a platinum wire is heated, it appears yellow at

Question # 15

The special theory of relatively treats the problems involving:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
2 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
3 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
4 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
5 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
6 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
9 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
10 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above

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  • hasnain

    hasnain

    30 May 2018

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