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

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

Question # 2

Davision and Germer performed experiment to verify

Question # 3

de-Broglies hypthesis was experimentally verified by

Question # 4

Electromagnetic -radiation means:

Question # 5

The special theory of relativity is based on the

Question # 6

Position was discovered by Carl Anderson in

Question # 7

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 8

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

Question # 9

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

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

According to the Max plank, energy is redialed or absorbed in

Question # 12

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

Question # 13

The unit of work function is:

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

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

Question # 16

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

Question # 17

The inside cavity of the black body is

Question # 18

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

Question # 19

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

Question # 20

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 # 21

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

Question # 22

There is no way to detect:

Question # 23

the symbol to be used in relativity problems denotes:

Question # 24

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

Question # 25

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

Question # 26

The photon of radio-waves has energy of about

Question # 27

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 # 28

Compton shift refers to:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
2 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
3 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
4 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
5 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
6 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
7 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
8 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
9 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
10 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

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