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

Question # 2

0.1 kg mass will be equivalent to the energy

Question # 3

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

Question # 4

The special theory of relatively treats the problems involving:

Question # 5

The energy of the 4th orbit in hydrogen atom is

Question # 6

Compton shift refers to:

Question # 7

Wave nature of particle was proposed by

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

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

Question # 13

Davision and Germer performed experiment to verify

Question # 14

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

Question # 15

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 # 16

Photoelectric effect takes place with a photon of:

Question # 17

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

Question # 18

A black body is

Question # 19

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

Question # 20

Intensity of light determines the:

Question # 21

When a platinum wire is heated, it appears white at

Question # 22

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

Question # 23

The inside cavity of the black body is

Question # 24

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

Question # 25

A non-inertial frame of reference is one, in which

Question # 26

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

Question # 27

The Stephen-Boltzmann law for the black body radiation is given by

Question # 28

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 29

S.I. unit of planks constant is

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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)
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 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
4 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
5 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
6 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
7 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
8 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
9 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
10 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm

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