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

Which of the following is not an example of intertial frame

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

The concept of direction and position are purely

Question # 4

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 # 5

When a position comes close to an electron they annihilate into

Question # 6

There is no way to detect:

Question # 7

Practically the quantity v/c is always:

Question # 8

Electromagnetic -radiation means:

Question # 9

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

Question # 10

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

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

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

Question # 13

Victor de-Brogile received the Nobel prize in physics in

Question # 14

Absolute motion cannot be detected

Question # 15

A black body is

Question # 16

The inside cavity of the black body is

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

Newton's law of motion do not hold in

Question # 24

An inertial frame is that frame in which

Question # 25

The energy of a photon is represented by

Question # 26

When the atomic particle are moving with velocities approaching that of light:

Question # 27

Strictly speaking, the earth is:

Question # 28

A photon is considered to have

Question # 29

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 30

Which of the following phenomenon proves the particle nature of light

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
3 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
4 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
5 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
6 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
8 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
9 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
10 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction

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