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

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 2

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

Question # 3

the symbol to be used in relativity problems denotes:

Question # 4

An inertial frame is that frame in which

Question # 5

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 6

The photon of radio-waves has energy of about

Question # 7

The energy of a photon is represented by

Question # 8

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 9

The Einstein's changes in length, mass and time are not observed in common life because

Question # 10

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 13

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

Question # 14

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

Question # 15

According to the Max plank, energy is redialed or absorbed in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
2 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
3 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
4 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
5 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
6 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
7 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
8 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
9 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
10 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these

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