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

00:00
Question # 1

When a platinum wire is heated, it appears yellow at

Question # 2

A photon is considered to have

Question # 3

The special theory of relativity is based on:

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

An intertial frame of reference is a frame of reference which is

Question # 9

Which of the following is not an example of intertial frame

Question # 10

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

Question # 11

The special theory of relativity is based on the

Question # 12

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 # 13

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

Question # 14

Which one of the following physical quantities changes with relativistic speed

Question # 15

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 16

The concept of direction is purely:

Question # 17

The unit of work function is:

Question # 18

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

Question # 19

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

Question # 20

Momentum is a parameter associated with

Question # 21

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

Question # 22

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

Question # 23

Electromagnetic radiation or photons interact with matter in

Question # 24

The concept of direction and position are purely

Question # 25

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

Question # 26

There is no way to detect:

Question # 27

The energy of photon 'E' is proported to

Question # 28

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

Question # 29

Davision and Germer performed experiment to verify

Question # 30

Compton was awarded Nobel prize in physics in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
3 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
4 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
5 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
6 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
7 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
8 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
9 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
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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