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

Photocell is a device which converts

Question # 2

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

Question # 3

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

Question # 4

Electromagnetic -radiation means:

Question # 5

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

Question # 6

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

Question # 7

When a platinum wire is heated, it appears white at

Question # 8

At the temperature, a body emits radiation which is principally

Question # 9

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 10

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

Question # 11

The general theory of relativity treats problems involving

Question # 12

The photon of radio-waves has energy of about

Question # 13

The unit of work function is:

Question # 14

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

Question # 15

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
2 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
3 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
4 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
5 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
8 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
9 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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