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

00:00
Question # 1

The idea of quantization of energy was proposed by:

Question # 2

Compton was awarded Nobel prize in physics in

Question # 3

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

Question # 4

When a position comes close to an electron they annihilate into

Question # 5

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

Question # 6

A particle having mass and charge equal to that of an electron is called:

Question # 7

An inertial frame is that frame in which

Question # 8

Photoelectrons are emitted when ultraviolet light falls on:

Question # 9

According to the special theory of relativity, time is

Question # 10

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

Question # 11

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

Question # 12

When a platinum wire is heated, it appears white at

Question # 13

The photon of radio-waves has energy of about

Question # 14

The energy of photon 'E' is proported to

Question # 15

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

Question # 16

0.1 kg mass will be equivalent to the energy

Question # 17

Position was discovered by Carl Anderson in

Question # 18

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

Question # 19

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 20

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

Question # 21

According to the Max plank, energy is redialed or absorbed in

Question # 22

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 # 23

Wien's constant is measured in:

Question # 24

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

Question # 25

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 26

The unit of work function is:

Question # 27

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

Question # 28

According to the special theory of relativity, a moving clock

Question # 29

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

Question # 30

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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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 nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
3 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
4 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
5 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
6 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
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
9 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
10 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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