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 symbol to be used in relativity problems denotes:

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The special theory of relatively treats the problems involving:

Question # 11

According to the special theory of relativity, time is

Question # 12

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 13

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 14

A photon is considered to have

Question # 15

Which of the following is not an example of intertial frame

Question # 16

de-Broglies hypthesis was experimentally verified by

Question # 17

The idea of quantization of energy was proposed by:

Question # 18

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

Question # 19

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

Question # 20

The special theory of relativity treats problems invoving

Question # 21

The value of threshold frequency for different metals is

Question # 22

Which one of the following physical quantities changes with relativistic speed

Question # 23

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

Question # 24

Electromagnetic radiation or photons interact with matter in

Question # 25

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

Question # 26

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

Question # 27

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 28

According to the special theory of relativity, a moving clock

Question # 29

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

Question # 30

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

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ECAT Class Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
2 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
3 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
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
6 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
7 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
8 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
9 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
10 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal

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