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

A black body is

Question # 2

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

Question # 3

The special theory of relativity is based on the

Question # 4

The inside cavity of the black body is

Question # 5

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

Question # 6

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 7

As the light shines on the metal surface, the electrons are ejected

Question # 8

Compton was awarded Nobel prize in physics in

Question # 9

Photoelectric effect takes place with a photon of:

Question # 10

Practically the quantity v/c is always:

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

Which of the following is not an example of intertial frame

Question # 13

The photon of radio-waves has energy of about

Question # 14

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

Question # 15

In photoelectric effect the energy of ejected electrons depend on

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
2 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
3 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
4 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
5 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
8 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
9 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
10 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these

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