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

Converse of pair production is known as

Question # 2

Victor de-Brogile received the Nobel prize in physics in

Question # 3

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 4

The unit of work function is:

Question # 5

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 6

Photoelectric effect takes place with a photon of:

Question # 7

According to the special theory of relativity

Question # 8

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

Question # 9

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 10

When a position comes close to an electron they annihilate into photons such that

Question # 11

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

Question # 12

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

Question # 13

The photon of radio-waves has energy of about

Question # 14

Photoelectrons are emitted when ultraviolet light falls on:

Question # 15

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
4 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
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 is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
8 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
9 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
10 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass

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