ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The photon of radio-waves has energy of about

Question # 2

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

Question # 3

The energy of a photon is represented by

Question # 4

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

Question # 5

The general theory of relativity treats problems involving

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

The Einstein's changes in length, mass and time are not observed in common life because

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Intensity of light determines the:

Question # 13

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

Question # 14

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
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 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
4 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
5 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
6 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
7 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
8 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
9 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
10 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules

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