Conductor and Conductance MCQs

31. Which material is commonly used in electrical wiring due to its excellent conductivity?

• A) Silver
• B) Iron
• C) Copper
• D) Lead
• Answer: C

32. Which of the following substances is NOT a good conductor of electricity?

• A) Gold
• B) Rubber
• C) Silver
• D) Iron
• Answer: B

33. When the area of cross-section of a conductor increases, the conductance:

• A) Increases
• B) Decreases
• C) Remains constant
• D) Doubles
• Answer: A

34. Which property of a conductor allows it to conduct electricity?

• A) The presence of free electrons
• B) High melting point
• C) High density
• D) Low thermal conductivity
• Answer: A

35. The ability of a material to allow the flow of electric current is termed:

• A) Resistance
• B) Conductance
• C) Inductance
• D) Reactance
• Answer: B

36. A material that does not conduct electricity under normal conditions is called:

• A) Conductor
• B) Insulator
• C) Semiconductor
• D) Superconductor
• Answer: B

37. Which of the following units measures electrical conductance?

• A) Joule
• B) Volt
• C) Ohm
• D) Siemens
• Answer: D

38. What is the effect of increasing the length of a conductor on its resistance?

• A) Decreases resistance
• B) Increases resistance
• C) No effect
• D) Resistance becomes zero
• Answer: B

39. Which of the following materials has the lowest resistivity?

• A) Copper
• B) Glass
• C) Rubber
• D) Plastic
• Answer: A

40. Conductivity of a material is inversely proportional to its:

• A) Temperature
• B) Resistance
• C) Current
• D) Voltage
• Answer: B