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

Absolute motion cannot be detected

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Compton shift refers to:

Question # 11

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

Question # 12

With the help of 50 K v electron microscope, a resolution of

Question # 13

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

Question # 14

There is no way to detect:

Question # 15

Which of the following is not an example of intertial frame

Question # 16

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 17

Photoelectric effect takes place with a photon of:

Question # 18

When a platinum wire is heated, it appears dull red at about

Question # 19

The concept of direction and position are purely

Question # 20

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

Question # 21

When a platinum wire is heated, it appears white at

Question # 22

Photocell is a device which converts

Question # 23

Electromagnetic -radiation means:

Question # 24

The value of the Stephen's constant for black body radiations is given by

Question # 25

A black body is

Question # 26

The value of threshold frequency for different metals is

Question # 27

When a platinum wire is heated, it appears orange red at

Question # 28

Practically the quantity v/c is always:

Question # 29

The positron was discovered by:

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
2 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
3 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
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 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
6 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
7 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
8 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
9 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
10 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m

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