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

Question # 2

The nature of radiations emitted by a hot body depends upon its:

Question # 3

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

Question # 4

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

Question # 5

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 6

The Einstein's changes in length, mass and time are not observed in common life because

Question # 7

According to the special theory of relativity, a moving clock

Question # 8

Davision and Germer performed experiment to verify

Question # 9

The value of the plank's constant 'h' is given by

Question # 10

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

Question # 11

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

Question # 12

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 13

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 14

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

Question # 15

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
2 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
3 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
4 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
5 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
10 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0

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