Unit 16: Current Electricity

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1. Resistance increases with increase in:

A Area

B Length

C Temperature (for metals)

D Both B and C

2. A material having very high resistivity is called:

A Conductor

B Semiconductor

C Insulator

D Alloy

3. The frequency of AC supply in Pakistan is approximately:

A 25 Hz

B 50 Hz

C 60 Hz

D 100 Hz

4. One ampere of current means the flow of charge equal to:

A 1 coulomb per second

B 1 joule per second

C 1 volt per second

D 1 ohm per second

5. The SI unit of potential difference is:

A Ampere

B Ohm

C Volt

D Watt

6. Copper is widely used for electrical wiring because it has:

A High resistivity

B Low resistivity

C No resistance

D High density

7. The SI unit of resistivity is:

A Ohm

B Ohm meter

C Volt per ampere

D Ampere meter

8. One volt is equal to:

A One joule per coulomb

B One coulomb per joule

C One ampere per second

D One ohm per ampere

9. Direct current (DC) flows in:

A Both directions alternately

B One direction only

C Random directions

D Circular paths only

10. In the formula R = ρL/A, the symbol ρ represents:

A Resistance

B Charge density

C Resistivity

D Potential difference

Unit 16: Current Electricity

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