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

Intensity of light determines the:

Question # 2

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

Question # 3

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

Question # 4

Electromagnetic radiation or photons interact with matter in

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

When a position comes close to an electron they annihilate into

Question # 9

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

Question # 10

Wave nature of particle was proposed by

Question # 11

Victor de-Brogile received the Nobel prize in physics in

Question # 12

Compton shift refers to:

Question # 13

The unit of work function is:

Question # 14

A photon is considered to have

Question # 15

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

Question # 16

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

Question # 17

There is no way to detect:

Question # 18

Position was discovered by Carl Anderson in

Question # 19

Absolute motion cannot be detected

Question # 20

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

Question # 21

Which of the following is not an example of intertial frame

Question # 22

Photocell is a device which converts

Question # 23

The idea of quantization of energy was proposed by:

Question # 24

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

Question # 25

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

Question # 26

Davision and Germer performed experiment to verify

Question # 27

When platinum wire is heated, it appears cherry red at

Question # 28

The special theory of relatively treats the problems involving:

Question # 29

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

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 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
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 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
4 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
5 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
6 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
7 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
8 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
9 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
10 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons

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