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

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

Question # 2

The inside cavity of the black body is

Question # 3

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 4

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

Question # 5

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

Question # 6

the dilation of time applies to the timing processes which are:

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

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

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

As the light shines on the metal surface, the electrons are ejected

Question # 11

Momentum is a parameter associated with

Question # 12

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 13

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

Question # 14

Pair production is the phenomenon in which

Question # 15

The concept of direction and position are purely

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
2 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
3 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
5 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
6 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
7 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
10 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them

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