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

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

Question # 2

When platinum wire is heated, it appears cherry red at

Question # 3

The concept of direction is purely:

Question # 4

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

Question # 5

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

Question # 6

The photon of radio-waves has energy of about

Question # 7

de-Broglies hypthesis was experimentally verified by

Question # 8

According to the special theory of relativity

Question # 9

the symbol to be used in relativity problems denotes:

Question # 10

The length contraction happens only

Question # 11

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 # 12

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

Question # 13

Due to relative motion of observer and the frame of reference of events, time always:

Question # 14

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

Question # 15

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 16

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

Question # 17

An inertial frame is that frame in which

Question # 18

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

Question # 19

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 20

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

Question # 21

The inside cavity of the black body is

Question # 22

Victor de-Brogile received the Nobel prize in physics in

Question # 23

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

Question # 24

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 # 25

Electromagnetic -radiation means:

Question # 26

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

Question # 27

Photoelectric effect takes place with a photon of:

Question # 28

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

Question # 29

Position was discovered by Carl Anderson in

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
3 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
4 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
5 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
8 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
9 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
10 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV

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