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

Question # 2

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 3

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

Question # 4

S.I. unit of planks constant is

Question # 5

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

Question # 6

From the theory of relativity, momentum p of the photon is related to energy as

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Wien's constant is measured in:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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 # 18

Practically the quantity v/c is always:

Question # 19

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

Question # 20

the symbol to be used in relativity problems denotes:

Question # 21

The value of threshold frequency for different metals is

Question # 22

The photon of radio-waves has energy of about

Question # 23

An inertial frame is that frame in which

Question # 24

In photoelectric effect the energy of ejected electrons depend on

Question # 25

The idea of quantization of energy was proposed by:

Question # 26

Intensity of light determines the:

Question # 27

Pair production is the phenomenon in which

Question # 28

0.1 kg mass will be equivalent to the energy

Question # 29

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

Question # 30

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
2 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
3 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
4 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
5 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
6 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
7 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
8 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
9 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
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

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