# Electricity

40 Questions

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• 1.
Concerning the flow of electricity, materials such as rubber, glass, and dry wood are known as
• A.

Conductors

• B.

Insulators

• C.

Thermocouples

• D.

D electric cells

• 2.
Dry wood makes a good conductor.
• A.

True

• B.

False

• 3.
A ______ is the fundamental unit of a battery.
• A.

Watt

• B.

Thermocouple

• C.

Cell

• D.

None of the above answers are correct.

• 4.
Ohm's law maybe expressed as an equation I=E/R, where "E" represents:
• A.

Resistance in ohms.

• B.

Voltage in volts

• C.

Current in amperes.

• D.

None of the answers are correct.

• 5.
Ohm's law may be expressed as an equation I=E/R, where "R" represents:
• A.

Resistance in ohms.

• B.

Voltage in volts.

• C.

Current in amperes.

• D.

None of the answers are correct.

• 6.
When voltage is doubled, power is
• A.

Tripled

• B.

Halved

• C.

Doubled

• D.

Doubled twice

• 7.
The study of electricity began with the ancient___________
• A.

Egyptians

• B.

Jews

• C.

Greeks

• D.

Europeans

• 8.
Charged atoms are called_________
• A.

Ohms

• B.

Conductors

• C.

Photoelectrons

• D.

Ions

• 9.
The flow of electrical energy through a conductor is called
• A.

an electric charge

• B.

Electric current, or electricity.

• C.

a negative charge.

• D.

a unit of conductance.

• 10.
Material that permits the free movement of a large number of electrons, such as copper wire, is known as a good
• A.

Conductor of electricity.

• B.

Insulator of electricity.

• C.

Example of electrolytic action.

• D.

Electromotive force.

• 11.
N order, the best conductors of electricity are
• A.

copper, aluminum, and silver wire.

• B.

aluminum, copper and silver wire.

• C.

Copper, silver, and aluminum wire.

• D.

Silver, copper, and aluminum wire.

• 12.
Electromotive force may be produced by
• A.

Friction and pressure.

• B.

Heat and light

• C.

Chemical action and magnetism.

• D.

All of the answers are correct.

• 13.
The true cause of electricity was found with the development of
• A.

Charged particles.

• B.

Atomic theory of matter.

• C.

Static electricity.

• D.

Protons

• 14.
A substance that has few free electrons is called
• A.

Ionic.

• B.

An insulator.

• C.

A conductor.

• D.

Electron deficient

• 15.
A common name for the voltage produced by rubbing two materials together is
• A.

Static electricity.

• B.

Friction.

• C.

Dynamic charge

• D.

Dry charge. Dry charge.

• 16.
Wires in an electric circuit are designed to keep
• A.

electrical resistance high.

• B.

Electrical current low.

• C.

electrical resistance low.

• D.

Distance from source voltage to load as far as possible.

• 17.
A significant feature of a battery composed of secondary cells such as an automobile battery is that it is
• A.

cheap.

• B.

Light

• C.

Rechargeable

• D.

None of the answers are correct.

• 18.
The direction of electron movement in any conductor is
• A.

From negative potential to positive potential.

• B.

From positive potential to negative potential.

• C.

between like charges.

• D.

in orbit around their nuclei.

• 19.
Which of the following kinds of waves can be felt by human beings?
• A.

Vibrations

• B.

• C.

• D.

Light

• 20.
The ___________ is the length of a cycle expressed in distance units.
• A.

Frequency

• B.

Amplitude

• C.

Wave length

• D.

Cycle

• 21.
The __________ is the number of cycles repeated during one second of time.
• A.

Frequency

• B.

Amplitude

• C.

Speed

• D.

Cycle

• 22.
The __________ is the wave strength at particular points along the wave.
• A.

Frequency

• B.

Amplitude

• C.

Wave length

• D.

Cycle

• 23.
________occurs when there is a change in the density or atmosphere in which the wave is
• A.

Trapping

• B.

Diffraction

• C.

Refraction

• D.

Reflection

• 24.
• A.

Trapping

• B.

Diffraction

• C.

Refraction

• D.

Reflection

• 25.
• A.

Trapping

• B.

Diffraction

• C.

Refraction

• D.

Reflection

• 26.
______ occurs when a temperature inversion in the atmosphere holds cold air close to the Earth's surface.
• A.

Trapping

• B.

Diffraction

• C.

Refraction

• D.

Reflection

• 27.
The following are all Navy radar general categories except:
• A.

Search

• B.

Rescue

• C.

Fire Control

• D.

Special

• 28.
The information gathered by most shipboard radar is presented and analyzed in a shipboard space called the
• A.

Combat Information Center.

• B.

All Weather Decoding Center.

• C.

• D.

Satellite Decoding Center.

• 29.
Radar can be used to track both friendly and potentially threatening
• A.

satellites.

• B.

Aircraft

• C.

Ships

• D.

• 30.
Radio waves are ______ from the ionosphere, which is generally 30-250 miles above the Earth.
• A.

Deflected

• B.

Reflected

• C.

Diffracted

• D.

Trapped

• 31.
What is the basic continuous wave of a modulated wave called?
• A.

Carrier Wave

• B.

Undercurrent wave

• C.

Sound waves

• D.

• 32.
What is one complete sequence of the strength of a wave as it passes through a point in space?
• A.

Cycle

• B.

Wavelength

• C.

Frequency

• D.

Aptitude

• 33.
Electronics is the basic study of _______________.
• A.

Electromagnetic waves

• B.

Space

• C.

Computer systems

• D.

circuitry

• 34.
The term RADAR stands for __________________.
• A.

• B.

• C.

• D.

• 35.
Frequency modulation is abbreviated as _______________.
• A.

FM

• B.

FMOD

• C.

AM

• D.

FR

• 36.
Amplitude modulation is abbreviated as __________
• A.

PM

• B.

AM

• C.

DW

• D.

FR

• 37.
_____________ uses highly sophisticated electronics to counter enemy electromagnetic waves.
• A.

Electronic Warfare

• B.

Anti Submarine Warfare

• C.

Electronics

• D.

Electricity

• 38.
What type of waves can travel through a complete vacuum?
• A.

Sound

• B.

Vibrations

• C.

Water Waves

• D.

Electromagnetic Waves

• 39.
What does every electronic device use for basic operation?
• A.

Mechanical waves

• B.

Electromagnetic waves

• C.

• D.

Light waves

• 40.
How is frequency (Hertz) abbreviated?
• A.

Ht

• B.

Hz

• C.

HR

• D.

HRZ