Unit 262 Resistivity & Temperature COEFICIENT Quiz

What does the resistance of an electrical conductor depend on?

• A) Length and cross-sectional area of the conductor only

• B) Type of material and temperature only

• C) Length, cross-sectional area, type of material, and temperature of the conductor

• D) Length and type of material only

If the length of a piece of wire is doubled, what happens to the resistance?

• A) The resistance is halved

• B) The resistance is doubled

• C) The resistance remains the same

• D) The resistance is quadrupled

What is the relationship between resistance (R) and the cross-sectional area (a) of a conductor?

• A) Directly proportional

• B) Inversely proportional

• C) No relation

• D) Exponentially proportional

What symbol is used to represent resistivity?

• A) R

• B) l

• C) a

• D) ρ (Greek rho)

Which material has the highest resistivity value as listed?

• A) Copper

• B) Aluminium

• C) Carbon (graphite)

• D) None of the above

What is the resistance of an 8 m length of wire if the resistance of a 5 m length of the same wire is 600 Ω?

• A) 960 Ω

• B) 800 Ω

• C) 1200 Ω

• D) 1500 Ω

If the resistance of a wire is 420 Ω and the proportionality constant is 120, what is the length of the wire?

• A) 3.5 m

• B) 4.5 m

• C) 5.5 m

• D) 6.5 m

What is the resistance of a wire with a cross-sectional area of 5 mm² if the original wire with a cross-sectional area of 2 mm² has a resistance of 300 Ω?

• A) 120 Ω

• B) 150 Ω

• C) 600 Ω

• D) 75 Ω

If the resistance of a wire is 750 Ω, what is the cross-sectional area of the wire given that the coefficient of proportionality, k, is 600?

• A) 0.8 mm²

• B) 1.2 mm²

• C) 0.5 mm²

• D) 1.0 mm²

What is the resistance of a wire of length 8 m and cross-sectional area 3 mm² if the resistance is directly proportional to the length and inversely proportional to the cross-sectional area?

• 0.16 Ω

• 1.44 Ω

• 8.00 Ω

• 3.00 Ω