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

Compton was awarded Nobel prize in physics in

Question # 2

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 3

The value of the Stephen's constant for black body radiations is given by

Question # 4

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 5

The idea of quantization of energy was proposed by:

Question # 6

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 7

An inertial frame is that frame in which

Question # 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:

Question # 9

A non-inertial frame of reference is one, in which

Question # 10

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

Question # 11

A black body is

Question # 12

The concept of direction is purely:

Question # 13

Which one of the following physical quantities changes with relativistic speed

Question # 14

The special theory of relativity treats problems invoving

Question # 15

The year when A.H. compton was awarded Nobel Prize is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
2 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
3 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
4 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
5 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
6 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
7 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
8 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
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 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite

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