Factors Affecting Resistance and How They Affect

Q.

State any two factors which affect the resistance of a metallic wire.

Q.

In a circuit two resistances of the same material and cross section area but different length $L_1$ & $L_2$ are kept in series. Find the length of the equivalent resistance if it’s made of the same material and same cross section area.

1. 1/L1 + 1/L2

2. L1xL2/(L1+L2)

3. L1+L2

4. L1-L2

Q.

Certain wire has resistance of 10 Ohm. If it is stretched by 1/10th of its length, then its resistance is nearly:

1. 9 Ω

2. 10 Ω

3. 11 Ω

4. 12 Ω

Q.

1 kg piece of copper is drawn into a wire 1 mm² thick, and another 1 kg copper piece into a wire 2 mm² thick. Compare the resistance of these wires.

1. 2:1

2. 16:1

3. 8:1

4. 4:1

Q.

The resistance of a wire, of length 'l', is RΩ. The wire is stretched to double its length keeping the volume constant. The resistance of the wire will become?

1. 4 R Ω

2. 2 R Ω

3. $\frac{R}{2}$ Ω

4. $\frac{R}{4}$ Ω

Q.

Thicker wire will have more resistance than a thinner wire. TRUE/FALSE?

1. True

2. False

Q.

A wire has a diameter of 0.5 mm and a resistivity of 1.6 × ${10}^{-6}$ ohm cm. How much of this wire would be required to make a 10 ohm coil?

1. 1000 m

2. 112.7 m

3. 157.6 m

4. 57 m

Q.

The resistance of 100 m long copper wire with diameter 1 mm is = ___ ohms.

Q.

The resistance of a wire does not depend on the area of cross section of the wire.

1. Length of conductor

2. Area of cross-section

Q.

A thick wire has smaller resistance while a thin wire has larger resistance.

1. True

2. False