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

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

Question # 2

A black body is

Question # 3

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

Question # 4

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

Question # 5

When the atomic particle are moving with velocities approaching that of light:

Question # 6

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

Question # 7

the symbol to be used in relativity problems denotes:

Question # 8

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

Question # 9

Photoelectrons are emitted when ultraviolet light falls on:

Question # 10

The idea of quantization of energy was proposed by:

Question # 11

Electromagnetic -radiation means:

Question # 12

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

Question # 13

The mass of an object will be doubled at speed

Question # 14

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

Question # 15

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
3 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
4 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
5 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
6 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
7 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
8 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
9 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
10 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

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