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

00:00
Question # 1

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

Question # 2

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

Question # 3

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 # 4

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

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

Wave nature of particle was proposed by

Question # 7

If a material object moves with the speed of light 'C' its mass becomes

Question # 8

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

Question # 9

When the atomic particle are moving with velocities approaching that of light:

Question # 10

Intensity of light determines the:

Question # 11

The concept of direction and position are purely

Question # 12

The general theory of relativity treats problems involving

Question # 13

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

Question # 14

de-Broglies hypthesis was experimentally verified by

Question # 15

Strictly speaking, the earth is:

Question # 16

Photocell is a device which converts

Question # 17

Which of the following is not an example of intertial frame

Question # 18

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

Question # 19

With the help of 50 K v electron microscope, a resolution of

Question # 20

The photon of radio-waves has energy of about

Question # 21

When a platinum wire is heated, it appears white at

Question # 22

The special theory of relativity is based on the

Question # 23

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

Question # 24

The length contraction happens only

Question # 25

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

Question # 26

Which of the following phenomenon proves the particle nature of light

Question # 27

When a platinum wire is heated, it appears orange red at

Question # 28

Victor de-Brogile received the Nobel prize in physics in

Question # 29

Position was discovered by Carl Anderson in

Question # 30

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
2 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
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 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
5 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
6 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
7 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
8 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
9 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
10 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well

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