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

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

Question # 2

When a platinum wire is heated, it appears yellow at

Question # 3

A photon is considered to have

Question # 4

The general theory of relativity treats problems involving

Question # 5

When a platinum wire is heated, it appears dull red at about

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

According to the special theory of relativity, a moving clock

Question # 12

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 13

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

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 16

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 17

According to the special theory of relativity

Question # 18

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

Question # 19

Wave nature of particle was proposed by

Question # 20

Wien's constant is measured in:

Question # 21

The energy of the 4th orbit in hydrogen atom is

Question # 22

An inertial frame is that frame in which

Question # 23

The concept of direction and position are purely

Question # 24

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

Question # 25

A black body is

Question # 26

An intertial frame of reference is a frame of reference which is

Question # 27

Compton was awarded Nobel prize in physics in

Question # 28

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

Question # 29

Which of the following phenomenon proves the particle nature of light

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
3 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
5 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
6 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
7 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
8 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
9 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
10 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

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