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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The length contraction happens only

Question # 2

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

Question # 3

Photocell is a device which converts

Question # 4

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 5

The year when A.H. compton was awarded Nobel Prize is:

Question # 6

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 7

Absolute motion cannot be detected

Question # 8

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 # 9

0.1 kg mass will be equivalent to the energy

Question # 10

The special theory of relativity treats problems invoving

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

S.I. unit of planks constant is

Question # 13

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 14

The special theory of relatively treats the problems involving:

Question # 15

Converse of pair production is known as

Question # 16

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

Question # 17

Due to relative motion of observer and the frame of reference of events, time always:

Question # 18

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 19

Compton shift refers to:

Question # 20

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 21

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

Question # 22

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

Question # 23

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 24

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

Question # 25

An inertial frame is that frame in which

Question # 26

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

Question # 27

Victor de-Brogile received the Nobel prize in physics in

Question # 28

Photoelectrons are emitted when ultraviolet light falls on:

Question # 29

The inside cavity of the black body is

Question # 30

The existence of position was predicted by Dirace in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
2 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
3 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
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 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
7 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
8 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
9 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
10 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these

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