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

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

Question # 2

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

Question # 3

Davision and Germer performed experiment to verify

Question # 4

The special theory of relatively treats the problems involving:

Question # 5

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

Question # 6

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

Question # 7

Strictly speaking, the earth is:

Question # 8

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

Question # 9

The existence of position was predicted by Dirace in

Question # 10

Which of the following phenomenon proves the particle nature of light

Question # 11

S.I. unit of planks constant is

Question # 12

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 13

A black body is

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
2 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
3 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
4 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
5 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
6 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
7 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
8 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
9 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
10 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2

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