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

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

Question # 2

Strictly speaking, the earth is:

Question # 3

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

Question # 4

Electromagnetic radiation or photons interact with matter in

Question # 5

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

Question # 6

Compton shift refers to:

Question # 7

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

Question # 8

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

Question # 9

0.1 kg mass will be equivalent to the energy

Question # 10

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

Question # 11

The special theory of relatively treats the problems involving:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Position was discovered by Carl Anderson in

Question # 16

The idea of quantization of energy was proposed by:

Question # 17

Photocell is a device which converts

Question # 18

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 # 19

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 # 20

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

Question # 21

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 22

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 23

When a platinum wire is heated, it appears yellow at

Question # 24

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

Question # 25

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

Question # 26

In order to produce pair production, a photon must have a energy

Question # 27

When platinum wire is heated, it appears cherry red at

Question # 28

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

Question # 29

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

Question # 30

Electromagnetic -radiation means:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
2 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
3 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
4 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
5 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
6 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 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
8 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 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

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