(B1) CURRENT ELECTRICITY(11/10/24)

Assertion : The connecting wires are made of copper. Reason : The electrical conductivity of copper is high.

• Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
• Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation assertion (A).
• Assertion (A) is true but reason (R) is false.
• Assertion (A) is false but reason (R) is true.

The graph between voltage and current for a conductor is a straight line. The slope of the graph represents :

• electric potential
• resistance
• resistivity
• none of these

SI unit of power is ...............

• joule hour.
• watt
• watt hour
• kilowatt

Assertion : When the length of a wire is doubled, then its resistance also gets doubled. Reason : The resistance of a wire is directly proportional to its length.

• Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
• Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
• (c) Assertion (A) is true but reason (R) is false.
• (d) Assertion (A) is false but reason (R) is true.

Kilowatt hour and kilowatt are :

• (a) SI units of power and electric energy
• (b) commercial units of electric energy and power
• (c) commercial units of power and electric energy
• (d) SI units of electric energy and power