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

From the theory of relativity, momentum p of the photon is related to energy as

Question # 2

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 3

Which of the following phenomenon proves the particle nature of light

Question # 4

If a material object moves with the speed of light 'C' its mass becomes

Question # 5

The special theory of relatively treats the problems involving:

Question # 6

According to the special theory of relativity, time is

Question # 7

the symbol to be used in relativity problems denotes:

Question # 8

Wien's constant is measured in:

Question # 9

Photocell is a device which converts

Question # 10

The year when A.H. compton was awarded Nobel Prize is:

Question # 11

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

Question # 12

Which one of the following physical quantities changes with relativistic speed

Question # 13

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

Question # 14

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

Question # 15

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
2 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
3 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
4 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
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 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
7 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
8 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
10 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these

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