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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 2

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 3

de-Broglies hypthesis was experimentally verified by

Question # 4

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 5

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

Question # 6

Photocell is a device which converts

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

Photoelectrons are emitted when ultraviolet light falls on:

Question # 9

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 10

Intensity of light determines the:

Question # 11

The special theory of relativity treats problems invoving

Question # 12

The mass of an object will be doubled at speed

Question # 13

Which of the following phenomenon proves the particle nature of light

Question # 14

In order to produce pair production, a photon must have a energy

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
2 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
3 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
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 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
6 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
7 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
8 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
9 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
10 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

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