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

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

Question # 2

In order to produce pair production, a photon must have a energy

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The length contraction happens only

Question # 8

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 9

When a platinum wire is heated, it appears white at

Question # 10

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

Question # 11

When a position comes close to an electron they annihilate into photons such that

Question # 12

When a position comes close to an electron they annihilate into

Question # 13

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 # 14

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

Question # 15

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

Question # 16

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

Question # 17

According to the special theory of relativity

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Which one of the following physical quantities changes with relativistic speed

Question # 22

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 23

The energy of a photon is represented by

Question # 24

The concept of direction is purely:

Question # 25

Newton's law of motion do not hold in

Question # 26

The special theory of relativity is based on the

Question # 27

S.I. unit of planks constant is

Question # 28

The unit of work function is:

Question # 29

A black body is

Question # 30

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
2 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
3 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
4 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
5 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
8 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
9 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
10 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant

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