Electrical Conductivity and Resistivity: Master the Electrical Properties of Materials

Question 1

Which material among the following exhibits the lowest electrical resistivity?

Accepted Answer

Copper

Answer

Aluminum

Answer

Steel

Answer

Rubber

Question 2

The SI unit of electrical conductivity is:

Accepted Answer

Siemens per meter (S/m)

Answer

Ohm-meter (Ωm)

Answer

Ampere per meter (A/m)

Answer

Volt per meter (V/m)

Question 3

Which factor does NOT influence the electrical conductivity of a material?

Accepted Answer

Density

Answer

Temperature

Answer

Impurities

Answer

Crystal structure

Question 4

Which material is considered a good electrical insulator?

Accepted Answer

Glass

Answer

Gold

Answer

Graphite

Answer

Sodium chloride

Question 5

What is the relationship between electrical conductivity and the number of free electrons in a material?

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

Unrelated

Answer

Logarithmically proportional

Question 6

A material with high electrical conductivity will generally have:

Accepted Answer

Low resistance

Answer

High dielectric constant

Answer

Low permittivity

Answer

High magnetic permeability

Question 7

Which of the following materials is the most conductive metal?

Accepted Answer

Silver

Answer

Copper

Answer

Gold

Answer

Aluminum

Question 8

Which of the following factors does NOT influence the electrical conductivity of a material?

Accepted Answer

Magnetic permeability

Answer

Temperature

Answer

Material composition

Answer

Crystal structure

Question 9

The reciprocal of electrical resistivity is known as:

Accepted Answer

Conductivity

Answer

Permittivity

Answer

Inductance

Answer

Capacitance

Question 10

A material with a high dielectric constant stores:

Accepted Answer

More electrical energy

Answer

Less electrical energy

Answer

More magnetic energy

Answer

Less magnetic energy

Question 11

A material with a low electrical resistivity will:

Accepted Answer

Allow electrons to move freely

Answer

Have a high dielectric constant

Answer

Be a good thermal insulator

Answer

Exhibit strong magnetic properties

Question 12

The electrical conductivity of a semiconductor:

Accepted Answer

Increases with increasing temperature

Answer

Decreases with increasing temperature

Answer

Remains constant with temperature

Answer

Becomes zero at absolute zero

Question 13

The unit of electrical resistivity in the International System of Units (SI) is:

Accepted Answer

Ohms per meter

Answer

Siemens per meter

Answer

Amperes per meter

Answer

Volts per meter

Question 14

A high dielectric constant indicates a material's:

Accepted Answer

High ability to store electrical energy

Answer

Low ability to conduct electricity

Answer

High resistance to electric fields

Answer

Low thermal conductivity

Question 15

A material with high resistivity is typically used as:

Accepted Answer

Electrical insulators

Answer

Electrical conductors

Answer

Semiconductors

Answer

Superconductors

Question 16

Which of the following is a semiconductor?

Accepted Answer

Silicon

Answer

Copper

Answer

Gold

Answer

Water

Question 17

Resistivity of a material is a measure of its:

Accepted Answer

Ability to resist the flow of electrical current

Answer

Ability to store electrical energy

Answer

Ability to conduct electricity

Answer

Dielectric constant

Question 18

Which of the following equations relates electrical conductivity (σ), resistivity (ρ), and length (L)?

Accepted Answer

σ = ρ / L

Answer

ρ = σ * L

Answer

L = σ / ρ

Answer

L = ρ * σ

Question 19

Which of the following materials has the highest electrical conductivity at room temperature?

Accepted Answer

Copper

Answer

Carbon (graphite)

Answer

Aluminum

Answer

Steel

Question 20

The electrical resistivity of a material is inversely proportional to its:

Accepted Answer

Conductivity

Answer

Cross-sectional area

Answer

Length

Answer

Temperature

Question 21

A semiconductor is a material with a:

Accepted Answer

Electrical conductivity between that of a conductor and an insulator

Answer

Lower conductivity than an insulator

Answer

Higher conductivity than a metal

Question 22

The permittivity (dielectric constant) of a material represents its ability to:

Accepted Answer

Store electrical energy

Answer

Resist the flow of current

Answer

Generate magnetic fields

Answer

Conduct electricity

Question 23

A material with a high resistivity is suitable for use as:

Accepted Answer

An electrical insulator

Answer

A semiconductor

Answer

A conductor

Answer

A superconductor

Question 24

The electrical conductivity of a material can be accurately measured using a:

Accepted Answer

Four-point probe

Answer

Voltmeter

Answer

Oscilloscope

Answer

Ammeter

Question 25

Which of the following materials has a negative temperature coefficient of resistance, meaning its resistance decreases with increasing temperature?

Accepted Answer

Thermistor

Answer

Capacitor

Answer

Resistor

Answer

Inductor

Question 26

The dielectric strength of a material is a measure of its ability to:

Accepted Answer

Withstand electric fields without breaking down

Answer

Conduct electricity

Answer

Store magnetic energy