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

An inertial frame is that frame in which

Question # 2

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

Question # 3

The idea of quantization of energy was proposed by:

Question # 4

The energy of the 4th orbit in hydrogen atom is

Question # 5

According to the special theory of relativity

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The length contraction happens only

Question # 10

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

Question # 11

0.1 kg mass will be equivalent to the energy

Question # 12

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

Question # 13

Davision and Germer performed experiment to verify

Question # 14

Intensity of light determines the:

Question # 15

The existence of position was predicted by Dirace in

Question # 16

Newton's law of motion do not hold in

Question # 17

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 18

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 19

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 20

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 # 21

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

Question # 22

the dilation of time applies to the timing processes which are:

Question # 23

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

Question # 24

The mass of an object will be doubled at speed

Question # 25

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 26

Compton shift refers to:

Question # 27

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

Question # 28

The unit of work function is:

Question # 29

Photoelectric effect takes place with a photon of:

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
2 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
3 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
4 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
7 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
8 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
9 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
10 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0

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