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

de-Broglies hypthesis was experimentally verified by

Question # 2

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

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

When a position comes close to an electron they annihilate into

Question # 5

The energy of the 4th orbit in hydrogen atom is

Question # 6

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 7

The unit of work function is:

Question # 8

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

Question # 9

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 10

Newton's law of motion do not hold in

Question # 11

Momentum is a parameter associated with

Question # 12

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

Question # 13

There is no way to detect:

Question # 14

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 15

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 16

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 17

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

Question # 18

0.1 kg mass will be equivalent to the energy

Question # 19

The idea of quantization of energy was proposed by:

Question # 20

When a platinum wire is heated, it appears dull red at about

Question # 21

When a position comes close to an electron they annihilate into photons such that

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

The length contraction happens only

Question # 27

Photocell is a device which converts

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
3 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
5 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
6 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
7 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
8 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
9 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
10 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle

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