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Electricity

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25 Qs about electricity, magnetism (ECE)
Clariña Virata
Quiz by Clariña Virata, updated more than 1 year ago
Clariña Virata
Created by Clariña Virata over 8 years ago
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Resource summary

Question 1

Question
Electrons are ALWAYS present in every material.
Answer
  • True
  • False

Question 2

Question
What is the charge of an electron?
Answer
  • 1.602 x 10-19 coulomb
  • 9.109 x 10-27 coulomb
  • No charge
  • None of the above

Question 3

Question
The nearer the electron from the nucleus, the higher its energy level.
Answer
  • True
  • False

Question 4

Question
Who improved Bohr’s atomic model?
Answer
  • Ernest Rutherford
  • A.G.A.A Volta
  • John Travolta
  • Jeremy Virata

Question 5

Question
Materials with exactly 4 valence electrons.
Answer
  • Conductor
  • Semiconductor
  • Insulator
  • None of the above

Question 6

Question
The region where free electrons are said to be present
Answer
  • Conduction band
  • Valence band
  • Rubber band
  • Energy band

Question 7

Question
A positive electric charge can be destroyed by a negative electric charge.
Answer
  • True
  • False

Question 8

Question
Electronegative elements give up electrons to produce negative ions.
Answer
  • True
  • False

Question 9

Question
When two or more charges exert forces simultaneously on another charge, the total force acting on the charge is the vector sum of the individual forces exerted by each charge. This is known as the:
Answer
  • Principle of superimposition
  • Principle of electromotive force
  • Principle of electro-position
  • Principle of superposition

Question 10

Question
For any closed system, the total electric flux passing through that surface is:
Answer
  • Directly proportional to the total charge inside the system
  • Inversely proportional to the total charge inside the system
  • Directly proportional to the half of the total charge inside the system
  • Inversely proportional to the half of the total charge inside the system
  • None of the above

Question 11

Question
In Gauss’s law, the electric field E MUST BE normal or perpendicular to the Gaussian surface.
Answer
  • True
  • False

Question 12

Question
What is the unit of electrical potential difference?
Answer
  • Joules
  • Coulombs
  • Volts
  • Ampere

Question 13

Question
The production of electric current, potential or voltage due to magnetism is called:
Answer
  • Electromagnetism
  • Electromagnetic Induction
  • Electromagnetic Conduction
  • Electromagnetic Production

Question 14

Question
The more domains aligned, the stronger is the magnetic field.
Answer
  • True
  • False

Question 15

Question
At saturation point, almost all domains are already aligned. So further increase in the magnetizing force will:
Answer
  • Add a large amount of domain alignments and therefore a huge increase in magnetic field
  • Add a few amount of domain alignments and therefore a huge increase in magnetic field
  • Add a large amount of domain alignments and therefore a little increase in magnetic field
  • Add a few amount of domain alignments and therefore a little increase in magnetic field

Question 16

Question
What is the source of magnetic fields:
Answer
  • Permanent Magnet
  • Earth itself
  • Current-Carrying Conductor
  • Only Permanent Magnet and Earth itself
  • All of the above

Question 17

Question
Nonmagnetic materials ______ magnetism to pass through them.
Answer
  • Allow
  • Does not allow
  • Both

Question 18

Question
It is used to make powerful permanent magnets. Very hard and difficult to machine; usually cast in their final shape; subject to strict procedure of heat and magnetic field treatment.
Answer
  • Aluminum, nickel, copper
  • Aluminum, nitrogen, copper
  • Copper, nitrogen, alloys
  • Cobalt, aluminum, nickel

Question 19

Question
19. ALL ferromagnetic materials have hysteresis loops. Temporary magnets have low retentivity.
Answer
  • True; True
  • True; False
  • False; True
  • False; False

Question 20

Question
The flux that does not follow to its intended path in a magnetic circuit.
Answer
  • Misplaced flux
  • Misdirected flux
  • Flowing-out flux
  • Leakage flux
  • Flux ALWAYS follows its intended path.

Question 21

Question
What is the reciprocal of reluctance?
Answer
  • Permiance
  • Performance
  • Personance
  • Permeance

Question 22

Question
What is the symbol for magnetic circuit’s flux density?
Answer
  • J
  • P
  • B
  • G

Question 23

Question
The concept whereby a small voltage is generated by a conductor with current in an external magnetic field is known as:
Answer
  • Faraday effect
  • Wiegand effect
  • Hall effect
  • Lenz’ effect

Question 24

Question
Coulomb is the SI unit of charge, how about cgs?
Answer
  • Statcoloumb
  • Static Unit
  • Electron Volt
  • Electron Unit

Question 25

Question
Find the dielectric constant of air.
Answer
  • Approximately 2
  • Approximately 1
  • Approximately - 1
  • Approximately - 2
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