ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

When platinum wire is heated, it appears cherry red at

Question # 2

Electromagnetic radiation or photons interact with matter in

Question # 3

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 4

According to the special theory of relativity, time is

Question # 5

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

Question # 6

Compton was awarded Nobel prize in physics in

Question # 7

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

Question # 8

The unit of work function is:

Question # 9

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 10

Converse of pair production is known as

Question # 11

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

Question # 12

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 13

According to the Max plank, energy is redialed or absorbed in

Question # 14

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

Question # 15

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 16

Momentum is a parameter associated with

Question # 17

When a position comes close to an electron they annihilate into photons such that

Question # 18

Photoelectrons are emitted when ultraviolet light falls on:

Question # 19

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

Question # 20

The Stephen-Boltzmann law for the black body radiation is given by

Question # 21

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

Question # 22

The special theory of relativity is based on the

Question # 23

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 24

The energy of photon 'E' is proported to

Question # 25

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 # 26

0.1 kg mass will be equivalent to the energy

Question # 27

The length contraction happens only

Question # 28

The general theory of relativity treats problems involving

Question # 29

A photon is considered to have

Question # 30

The concept of direction is purely:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
3 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
4 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
5 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
8 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
10 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron

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