Test
Electricity
Este test tiene tiempo límite, así que se abre en el reproductor de siempre.
Preguntas del test (25)
1Electrons are ALWAYS present in every material.
- ATrue
- BFalse
2What is the charge of an electron?
- A1.602 x 10-19 coulomb
- B9.109 x 10-27 coulomb
- CNo charge
- DNone of the above
3The nearer the electron from the nucleus, the higher its energy level.
- ATrue
- BFalse
4Who improved Bohr’s atomic model?
- AErnest Rutherford
- BA.G.A.A Volta
- CJohn Travolta
- DJeremy Virata
5Materials with exactly 4 valence electrons.
- AConductor
- BSemiconductor
- CInsulator
- DNone of the above
6The region where free electrons are said to be present
- AConduction band
- BValence band
- CRubber band
- DEnergy band
7A positive electric charge can be destroyed by a negative electric charge.
- ATrue
- BFalse
8Electronegative elements give up electrons to produce negative ions.
- ATrue
- BFalse
9When 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:
- APrinciple of superimposition
- BPrinciple of electromotive force
- CPrinciple of electro-position
- DPrinciple of superposition
10For any closed system, the total electric flux passing through that surface is:
- ADirectly proportional to the total charge inside the system
- BInversely proportional to the total charge inside the system
- CDirectly proportional to the half of the total charge inside the system
- DInversely proportional to the half of the total charge inside the system
- ENone of the above
11In Gauss’s law, the electric field E MUST BE normal or perpendicular to the Gaussian surface.
- ATrue
- BFalse
12What is the unit of electrical potential difference?
- AJoules
- BCoulombs
- CVolts
- DAmpere
13The production of electric current, potential or voltage due to magnetism is called:
- AElectromagnetism
- BElectromagnetic Induction
- CElectromagnetic Conduction
- DElectromagnetic Production
14The more domains aligned, the stronger is the magnetic field.
- ATrue
- BFalse
15At saturation point, almost all domains are already aligned. So further increase in the magnetizing force will:
- AAdd a large amount of domain alignments and therefore a huge increase in magnetic field
- BAdd a few amount of domain alignments and therefore a huge increase in magnetic field
- CAdd a large amount of domain alignments and therefore a little increase in magnetic field
- DAdd a few amount of domain alignments and therefore a little increase in magnetic field
16What is the source of magnetic fields:
- APermanent Magnet
- BEarth itself
- CCurrent-Carrying Conductor
- DOnly Permanent Magnet and Earth itself
- EAll of the above
17Nonmagnetic materials ______ magnetism to pass through them.
- AAllow
- BDoes not allow
- CBoth
18It 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.
- AAluminum, nickel, copper
- BAluminum, nitrogen, copper
- CCopper, nitrogen, alloys
- DCobalt, aluminum, nickel
1919. ALL ferromagnetic materials have hysteresis loops.
Temporary magnets have low retentivity.- ATrue; True
- BTrue; False
- CFalse; True
- DFalse; False
20The flux that does not follow to its intended path in a magnetic circuit.
- AMisplaced flux
- BMisdirected flux
- CFlowing-out flux
- DLeakage flux
- EFlux ALWAYS follows its intended path.
21What is the reciprocal of reluctance?
- APermiance
- BPerformance
- CPersonance
- DPermeance
22What is the symbol for magnetic circuit’s flux density?
- AJ
- BP
- CB
- DG
23The concept whereby a small voltage is generated by a conductor with current in an external magnetic field is known as:
- AFaraday effect
- BWiegand effect
- CHall effect
- DLenz’ effect
24Coulomb is the SI unit of charge, how about cgs?
- AStatcoloumb
- BStatic Unit
- CElectron Volt
- DElectron Unit
25Find the dielectric constant of air.
- AApproximately 2
- BApproximately 1
- CApproximately - 1
- DApproximately - 2
Información
- Descripción
- 25 Qs about electricity, magnetism (ECE)
- Autor
- Clariña Virata
- Idioma
- English
- Visitas
- 37
- Etiquetas
- Valoración
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