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

The special theory of relativity treats problems invoving

Question # 2

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 3

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 4

The concept of direction is purely:

Question # 5

Converse of pair production is known as

Question # 6

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

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

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

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

The mass of an object will be doubled at speed

Question # 11

The special theory of relativity is based on:

Question # 12

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 # 13

Which of the following is not an example of intertial frame

Question # 14

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

Question # 15

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
2 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
3 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
4 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
5 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
6 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
7 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
8 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
9 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
10 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935

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