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

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

Question # 2

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 3

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

Question # 4

According to the special theory of relativity

Question # 5

A non-inertial frame of reference is one, in which

Question # 6

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

Question # 7

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

Question # 8

The nature of radiations emitted by a hot body depends upon its:

Question # 9

According to the special theory of relativity, a moving clock

Question # 10

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

Question # 11

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

Question # 12

The special theory of relativity is based on:

Question # 13

Pair production is the phenomenon in which

Question # 14

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

Question # 15

Photoelectric effect takes place with a photon of:

Question # 16

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 17

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

Question # 18

the symbol to be used in relativity problems denotes:

Question # 19

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

Question # 20

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

Question # 21

The general theory of relativity treats problems involving

Question # 22

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

Question # 23

When a platinum wire is heated, it appears white at

Question # 24

Strictly speaking, the earth is:

Question # 25

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

Question # 26

The mass of an object will be doubled at speed

Question # 27

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

Question # 28

de-Broglies hypthesis was experimentally verified by

Question # 29

Wave nature of particle was proposed by

Question # 30

Intensity of light determines the:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
2 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
3 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
4 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
5 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
6 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
7 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
8 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
9 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
10 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above

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