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

00:00
Question # 1

According to the special theory of relativity, a moving clock

Question # 2

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

Question # 3

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

Question # 4

In photoelectric effect the energy of ejected electrons depend on

Question # 5

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

Question # 6

Intensity of light determines the:

Question # 7

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

Question # 8

Electromagnetic -radiation means:

Question # 9

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

Question # 10

The unit of work function is:

Question # 11

Absolute motion cannot be detected

Question # 12

Compton was awarded Nobel prize in physics in

Question # 13

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

Question # 14

The mass of an object will be doubled at speed

Question # 15

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

Question # 16

A black body is

Question # 17

Photoelectrons are emitted when ultraviolet light falls on:

Question # 18

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

Question # 19

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

Question # 20

Photocell is a device which converts

Question # 21

Electromagnetic radiation or photons interact with matter in

Question # 22

There is no way to detect:

Question # 23

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

Question # 24

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

Question # 25

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 # 26

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

Question # 27

Which of the following is not an example of intertial frame

Question # 28

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

Question # 29

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 30

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

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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 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
3 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
4 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
5 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
6 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
7 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
8 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
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
10 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero

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