5779423
Descrição
Quiz por Clariña Virata, atualizado more than 1 year ago
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Criado por Clariña Virata
quase 8 anos atrás
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Questão 1
Questão
Electrons are ALWAYS present in every material.
Responda
-
True
-
False
Questão 2
Questão
What is the charge of an electron?
Responda
-
1.602 x 10-19 coulomb
-
9.109 x 10-27 coulomb
-
No charge
-
None of the above
Questão 3
Questão
The nearer the electron from the nucleus, the higher its energy level.
Responda
-
True
-
False
Questão 4
Questão
Who improved Bohr’s atomic model?
Responda
-
Ernest Rutherford
-
A.G.A.A Volta
-
John Travolta
-
Jeremy Virata
Questão 5
Questão
Materials with exactly 4 valence electrons.
Responda
-
Conductor
-
Semiconductor
-
Insulator
-
None of the above
Questão 6
Questão
The region where free electrons are said to be present
Responda
-
Conduction band
-
Valence band
-
Rubber band
-
Energy band
Questão 7
Questão
A positive electric charge can be destroyed by a negative electric charge.
Responda
-
True
-
False
Questão 8
Questão
Electronegative elements give up electrons to produce negative ions.
Responda
-
True
-
False
Questão 9
Questão
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:
Responda
-
Principle of superimposition
-
Principle of electromotive force
-
Principle of electro-position
-
Principle of superposition
Questão 10
Questão
For any closed system, the total electric flux passing through that surface is:
Responda
-
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
Questão 11
Questão
In Gauss’s law, the electric field E MUST BE normal or perpendicular to the Gaussian surface.
Responda
-
True
-
False
Questão 12
Questão
What is the unit of electrical potential difference?
Responda
-
Joules
-
Coulombs
-
Volts
-
Ampere
Questão 13
Questão
The production of electric current, potential or voltage due to magnetism is called:
Responda
-
Electromagnetism
-
Electromagnetic Induction
-
Electromagnetic Conduction
-
Electromagnetic Production
Questão 14
Questão
The more domains aligned, the stronger is the magnetic field.
Responda
-
True
-
False
Questão 15
Questão
At saturation point, almost all domains are already aligned. So further increase in the magnetizing force will:
Responda
-
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
Questão 16
Questão
What is the source of magnetic fields:
Responda
-
Permanent Magnet
-
Earth itself
-
Current-Carrying Conductor
-
Only Permanent Magnet and Earth itself
-
All of the above
Questão 17
Questão
Nonmagnetic materials ______ magnetism to pass through them.
Responda
-
Allow
-
Does not allow
-
Both
Questão 18
Questão
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.
Responda
-
Aluminum, nickel, copper
-
Aluminum, nitrogen, copper
-
Copper, nitrogen, alloys
-
Cobalt, aluminum, nickel
Questão 19
Questão
19. ALL ferromagnetic materials have hysteresis loops.
Temporary magnets have low retentivity.
Responda
-
True; True
-
True; False
-
False; True
-
False; False
Questão 20
Questão
The flux that does not follow to its intended path in a magnetic circuit.
Responda
-
Misplaced flux
-
Misdirected flux
-
Flowing-out flux
-
Leakage flux
-
Flux ALWAYS follows its intended path.
Questão 21
Questão
What is the reciprocal of reluctance?
Responda
-
Permiance
-
Performance
-
Personance
-
Permeance
Questão 22
Questão
What is the symbol for magnetic circuit’s flux density?
Responda
-
J
-
P
-
B
-
G
Questão 23
Questão
The concept whereby a small voltage is generated by a conductor with current in an external magnetic field is known as:
Responda
-
Faraday effect
-
Wiegand effect
-
Hall effect
-
Lenz’ effect
Questão 24
Questão
Coulomb is the SI unit of charge, how about cgs?
Responda
-
Statcoloumb
-
Static Unit
-
Electron Volt
-
Electron Unit
Questão 25
Questão
Find the dielectric constant of air.
Responda
-
Approximately 2
-
Approximately 1
-
Approximately - 1
-
Approximately - 2
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