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

At the temperature, a body emits radiation which is principally

Question # 2

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

Question # 3

Which of the following is not an example of intertial frame

Question # 4

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 5

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

Question # 6

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

Question # 7

The idea of quantization of energy was proposed by:

Question # 8

S.I. unit of planks constant is

Question # 9

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 10

A photon is considered to have

Question # 11

When a platinum wire is heated, it appears yellow at

Question # 12

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

Question # 13

The special theory of relativity treats problems invoving

Question # 14

According to the special theory of relativity, a moving clock

Question # 15

Photocell is a device which converts

Question # 16

The mass of an object will be doubled at speed

Question # 17

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

Question # 18

Electromagnetic radiation or photons interact with matter in

Question # 19

The photon of radio-waves has energy of about

Question # 20

Absolute motion cannot be detected

Question # 21

Position was discovered by Carl Anderson in

Question # 22

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

Question # 23

Intensity of light determines the:

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

The positron was discovered by:

Question # 28

Strictly speaking, the earth is:

Question # 29

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 30

Photoelectrons are emitted when ultraviolet light falls on:

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
2 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
3 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
4 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
5 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
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
8 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
9 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
10 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s

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