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

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

Question # 2

The energy of a photon is represented by

Question # 3

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

Question # 4

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 5

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

Question # 6

The concept of direction and position are purely

Question # 7

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 8

Wien's constant is measured in:

Question # 9

Wave nature of particle was proposed by

Question # 10

The special theory of relatively treats the problems involving:

Question # 11

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 12

When a platinum wire is heated, it appears white at

Question # 13

Compton was awarded Nobel prize in physics in

Question # 14

The inside cavity of the black body is

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 dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
2 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)
3 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
5 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
6 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 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
9 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
10 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

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