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

There is no way to detect:

Question # 2

The special theory of relativity is based on the

Question # 3

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

Question # 4

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Photoelectrons are emitted when ultraviolet light falls on:

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

When a platinum wire is heated, it appears orange red at

Question # 12

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 # 13

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 14

Which of the following is not an example of intertial frame

Question # 15

Davision and Germer performed experiment to verify

Question # 16

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

Question # 17

When a position comes close to an electron they annihilate into

Question # 18

Wien's constant is measured in:

Question # 19

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

Question # 20

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 21

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

Question # 22

A black body is

Question # 23

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

Question # 24

The special theory of relativity treats problems invoving

Question # 25

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

Question # 26

Victor de-Brogile received the Nobel prize in physics in

Question # 27

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

Question # 28

The special theory of relatively treats the problems involving:

Question # 29

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 # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
2 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
3 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
4 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
5 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
6 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
7 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
8 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
9 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
10 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time

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