Resistance

Q. A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire:
[1 Mark]

A. decreases
B. remains the same
C. increases
D. increases for some time and then decreases.

Q. When an object has very high resistance, it always implies it is a very good conductor.

1. True
2. False

Q.

Resistance of a material assists in the smooth and fast flow of electrons through it.

1. True

2. False

Q.

__________ is the property by which a material hinders the flow of electrons

1. Current

2. Resistance

3. Power

4. Voltage

Q.

Resistance of alloys decreases with the increase in temperature.

1. False

2. True

Q.

Given 2 resistances, to get the maximum main current with a given voltage, we would:

1. Connect them in series.

2. Connect them in parallel.

3. Connect them either way.

4. Connect them at right angle to each other.

Q. In a closed circuit, the ratio of the voltage drop and the current flow between two points is known as ___ .

1. Resistance
2. Capacitance
3. Conductance
4. Inductance

Q.

Which element reduces the electric current in a circuit?

1. Resistance

2. Battery

3. Wire

4. Switch

Q. Calculate the resistance of a circuit where the current is 0.2 A and the potential difference is 0.8 V.

1. 4 ohm
2. 3 ohm
3. 0.25 ohm
4. 2 ohm

Q.

Which unit is used to express reactance in conductors and capacitors?

1. Farad

2. Siemen

3. Ohm

4. Henry