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

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 2

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

Question # 3

Compton shift refers to:

Question # 4

The Einstein's changes in length, mass and time are not observed in common life because

Question # 5

S.I. unit of planks constant is

Question # 6

As the light shines on the metal surface, the electrons are ejected

Question # 7

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

Question # 8

Newton's law of motion do not hold in

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

The energy of the 4th orbit in hydrogen atom is

Question # 11

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

Question # 12

Victor de-Brogile received the Nobel prize in physics in

Question # 13

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

Question # 14

The special theory of relatively treats the problems involving:

Question # 15

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 16

Electromagnetic radiation or photons interact with matter in

Question # 17

Intensity of light determines the:

Question # 18

The positron was discovered by:

Question # 19

The inside cavity of the black body is

Question # 20

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 21

The energy of photon 'E' is proported to

Question # 22

The special theory of relativity treats problems invoving

Question # 23

Wien's constant is measured in:

Question # 24

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

Question # 25

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

Question # 26

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 27

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

Question # 28

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

Question # 29

Compton was awarded Nobel prize in physics in

Question # 30

The nature of radiations emitted by a hot body depends upon its:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
2 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
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
8 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
9 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
10 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

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