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 the special theory of relativity, time is

Question # 2

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 3

The energy of photon 'E' is proported to

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Electromagnetic -radiation means:

Question # 13

The existence of position was predicted by Dirace in

Question # 14

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

Question # 15

According to the special theory of relativity

Question # 16

The concept of direction and position are purely

Question # 17

The special theory of relativity is based on the

Question # 18

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 19

The energy of a photon is represented by

Question # 20

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 21

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

Question # 22

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

Question # 23

When a platinum wire is heated, it appears white at

Question # 24

When a position comes close to an electron they annihilate into

Question # 25

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

Question # 26

de-Broglies hypthesis was experimentally verified by

Question # 27

According to the special theory of relativity, a moving clock

Question # 28

The idea of quantization of energy was proposed by:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
2 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
3 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
4 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
7 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
9 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
10 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1

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