ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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 special theory of relatively treats the problems involving:

Question # 2

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

Question # 3

The length contraction happens only

Question # 4

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

Question # 5

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 6

The energy of a photon is represented by

Question # 7

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

Question # 8

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 9

The value of threshold frequency for different metals is

Question # 10

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 # 11

Intensity of light determines the:

Question # 12

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 13

S.I. unit of planks constant is

Question # 14

A particle having mass and charge equal to that of an electron is called:

Question # 15

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
3 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
4 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
5 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
6 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
7 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
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 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
10 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity

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