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