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

Electromagnetic -radiation means:

Question # 2

Pair production is the phenomenon in which

Question # 3

When a position comes close to an electron they annihilate into

Question # 4

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

Question # 5

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Practically the quantity v/c is always:

Question # 11

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 12

0.1 kg mass will be equivalent to the energy

Question # 13

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

Question # 14

The length contraction happens only

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
2 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
3 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
4 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
5 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
6 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
7 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
8 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
9 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above

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