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

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

Question # 2

The special theory of relatively treats the problems involving:

Question # 3

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 4

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

Question # 5

Pair production is the phenomenon in which

Question # 6

Wien's constant is measured in:

Question # 7

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

Question # 8

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 9

According to the special theory of relativity, time is

Question # 10

The value of threshold frequency for different metals is

Question # 11

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 # 12

Victor de-Brogile received the Nobel prize in physics in

Question # 13

the symbol to be used in relativity problems denotes:

Question # 14

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

Question # 15

The special theory of relativity is based on:

Question # 16

When a position comes close to an electron they annihilate into

Question # 17

The value of the Stephen's constant for black body radiations is given by

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 22

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 23

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

Question # 24

Compton was awarded Nobel prize in physics in

Question # 25

When platinum wire is heated, it appears cherry red at

Question # 26

Davision and Germer performed experiment to verify

Question # 27

As the light shines on the metal surface, the electrons are ejected

Question # 28

The positron was discovered by:

Question # 29

A photon is considered to have

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
2 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
3 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
5 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
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 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
9 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
10 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these

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