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 energy of a photon is represented by

Question # 2

Wave nature of particle was proposed by

Question # 3

The inside cavity of the black body is

Question # 4

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 5

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

Question # 6

The special theory of relatively treats the problems involving:

Question # 7

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 8

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

Question # 9

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

Question # 10

In order to produce pair production, a photon must have a energy

Question # 11

The idea of quantization of energy was proposed by:

Question # 12

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 13

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 14

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

Question # 15

When a platinum wire is heated, it appears dull red at about

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
2 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
3 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
4 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
5 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
6 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
7 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
8 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
9 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
10 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

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