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

At the temperature, a body emits radiation which is principally

Question # 2

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

Question # 3

According to the special theory of relativity, time is

Question # 4

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 5

When a platinum wire is heated, it appears orange red at

Question # 6

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

Question # 7

Pair production is the phenomenon in which

Question # 8

The energy of the 4th orbit in hydrogen atom is

Question # 9

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 10

According to the special theory of relativity, a moving clock

Question # 11

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 12

Photocell is a device which converts

Question # 13

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 14

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 15

The nature of radiations emitted by a hot body depends upon its:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
2 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
3 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
4 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
5 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
6 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
7 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
8 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
9 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
10 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these

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