Quiz on Resistivity and Conductivity

What is the SI unit of electrical resistance?

• Ampere (A)

• Volt (V)

• Siemens (S)

• Ohm (Ω)

What does electrical resistivity measure?

• The flow of electric current

• The temperature of a conductor

• The resistance to electric current

• The speed of electrons

Which of the following is the formula for electrical resistance?

• R=ρA/L

• R=σL/A

• R=σA/L

• R=ρL/A

What happens to resistivity as temperature increases for most materials?

• It increases

• It remains constant

• It decreases

• It fluctuates

What is the relationship between conductivity and resistivity?

• Conductivity is the square of resistivity

• Conductivity is equal to resistivity

• Conductivity is half of resistivity

• Conductivity is the inverse of resistivity

What is the SI unit of electrical conductivity?

• Siemens per meter (S/m)

• Ohm-meter (Ω m)

• Ampere (A)

• Ohm (Ω)

What is the temperature coefficient of resistivity generally of the order of?

• 10−4

• 10−3

• 10−2

• 10−1

What phenomenon occurs in superconductors at very low temperatures?

• Increased resistance

• Zero resistivity

• Decreased conductivity

• Increased resistivity

What is the critical temperature for mercury to become a superconductor?

• 0 K

• 273 K

• 4.2 K

• 100 K

What is the formula for calculating resistivity at a given temperature?

• ρ = ρ0(1 + α(T - T0))

• ρ = ρ0(1 - α(T - T0))

• ρ = ρ0 + α(T - T0)

• ρ = ρ0 - α(T - T0)