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

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

Question # 2

S.I. unit of planks constant is

Question # 3

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

Question # 4

According to the special theory of relativity

Question # 5

The special theory of relatively treats the problems involving:

Question # 6

When a position comes close to an electron they annihilate into

Question # 7

The concept of direction and position are purely

Question # 8

When platinum wire is heated, it appears cherry red at

Question # 9

Which of the following phenomenon proves the particle nature of light

Question # 10

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

Question # 11

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

Question # 12

Victor de-Brogile received the Nobel prize in physics in

Question # 13

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

Question # 14

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

Question # 15

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 16

Electromagnetic -radiation means:

Question # 17

Practically the quantity v/c is always:

Question # 18

Compton shift refers to:

Question # 19

At the temperature, a body emits radiation which is principally

Question # 20

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

Question # 21

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

Question # 22

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 23

Photoelectric effect takes place with a photon of:

Question # 24

0.1 kg mass will be equivalent to the energy

Question # 25

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

Question # 26

the symbol to be used in relativity problems denotes:

Question # 27

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

Question # 28

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

Question # 29

The energy of photon 'E' is proported to

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
2 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
3 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
4 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
5 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
6 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
7 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
8 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
9 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
10 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

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