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

At the temperature, a body emits radiation which is principally

Question # 2

The energy of photon 'E' is proported to

Question # 3

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

Question # 4

The energy of a photon is represented by

Question # 5

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 6

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 7

Intensity of light determines the:

Question # 8

Electromagnetic radiation or photons interact with matter in

Question # 9

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 10

An inertial frame is that frame in which

Question # 11

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

Question # 12

The special theory of relativity is based on:

Question # 13

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

Question # 14

the symbol to be used in relativity problems denotes:

Question # 15

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
2 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
3 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
4 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
5 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
6 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
7 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
8 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
9 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
10 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White

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