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

Wien's constant is measured in:

Question # 2

If a material object moves with the speed of light 'C' its mass becomes

Question # 3

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 4

Converse of pair production is known as

Question # 5

The energy of a photon is represented by

Question # 6

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

Question # 7

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 8

The idea of quantization of energy was proposed by:

Question # 9

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

Question # 10

In photoelectric effect the energy of ejected electrons depend on

Question # 11

When a position comes close to an electron they annihilate into

Question # 12

Compton was awarded Nobel prize in physics in

Question # 13

Practically the quantity v/c is always:

Question # 14

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
3 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
4 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
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 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
7 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
8 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
9 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

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