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

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

Question # 2

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

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

Question # 5

Strictly speaking, the earth is:

Question # 6

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

Question # 7

Photocell is a device which converts

Question # 8

At the temperature, a body emits radiation which is principally

Question # 9

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 10

The special theory of relativity is based on the

Question # 11

The inside cavity of the black body is

Question # 12

The energy of photon 'E' is proported to

Question # 13

Compton was awarded Nobel prize in physics in

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

An inertial frame is that frame in which

Question # 22

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

Question # 23

Davision and Germer performed experiment to verify

Question # 24

The length contraction happens only

Question # 25

Which one of the following physical quantities changes with relativistic speed

Question # 26

Position was discovered by Carl Anderson in

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
3 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
4 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
5 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
6 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
7 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
8 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
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 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume

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