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 symbol to be used in relativity problems denotes:

Question # 2

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 3

Which of the following is not an example of intertial frame

Question # 4

There is no way to detect:

Question # 5

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

Photocell is a device which converts

Question # 8

S.I. unit of planks constant is

Question # 9

From the theory of relativity, momentum p of the photon is related to energy as

Question # 10

Which of the following phenomenon proves the particle nature of light

Question # 11

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

Question # 12

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

Question # 13

The general theory of relativity treats problems involving

Question # 14

Position was discovered by Carl Anderson in

Question # 15

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
2 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
3 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
4 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
5 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
6 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
7 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
8 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
9 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
10 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

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