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

Wien's constant is measured in:

Question # 3

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

Question # 4

The photon of radio-waves has energy of about

Question # 5

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

0.1 kg mass will be equivalent to the energy

Question # 10

Photoelectrons are emitted when ultraviolet light falls on:

Question # 11

The special theory of relativity is based on the

Question # 12

Victor de-Brogile received the Nobel prize in physics in

Question # 13

The concept of direction is purely:

Question # 14

At the temperature, a body emits radiation which is principally

Question # 15

Photocell is a device which converts

Question # 16

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

Question # 17

The existence of position was predicted by Dirace in

Question # 18

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

Question # 19

The special theory of relatively treats the problems involving:

Question # 20

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

Question # 21

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

Question # 22

A photon is considered to have

Question # 23

Which of the following is not an example of intertial frame

Question # 24

In photoelectric effect the energy of ejected electrons depend on

Question # 25

The value of the plank's constant 'h' is given by

Question # 26

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

Question # 27

Compton was awarded Nobel prize in physics in

Question # 28

There is no way to detect:

Question # 29

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 30

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
2 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
3 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
4 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
5 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
6 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
7 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
8 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
9 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
10 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m

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