The number density of free electrons in a copper conductor is 8.5×10²⁸ m^–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of the cross-section of the wire is 2.0×10^–6 m² and it is carrying a current of 3.0 A.

1.\(2.7 \times10^{4}\) s
2.\(3.3 \times10^{4}\) s
3.\(2.0 \times10^{3}\) s
4.\(3.9 \times10^{3}\) s

Six lead-acid type of secondary cells each of emf \(2.0\) V and internal resistance \(0.015~\Omega\) are joined in series to provide a supply to a resistance of \(8.5~\Omega\). What is the current drawn from the supply?
1. \(2.10~\text{A}\)
2. \(1.39~\text{A}\)
3. \(1.71~\text{A}\)
4. \(2.21~\text{A}\)

A secondary cell after long use has an emf of \(1.9\) V and a large internal resistance of \(380~\Omega\). What maximum current can be drawn from the cell?
1. \(0.05~\text{A}\)
2. \(0.005~\text{A}\)
3. \(5.0~\text{A}\)
4. \(0.5~\text{A}\)

The storage battery of a car has an emf of \(12\) V. If the internal resistance of the battery is \(0.4~\Omega\), what is the maximum current that can be drawn from the battery?
1. \(30\) A
2. \(20\) A
3. \(10\) A
4. \(40\) A

A battery of emf 10 V and internal resistance $3 \Omega$ is connected to a resistor. If the current in the circuit is 0.5 A, what is the terminal voltage of the battery when the circuit is closed?

1. 10 V
2. 8.5 V
3. 1.5 V
4. 7.2 V

Three resistors $1 \Omega , 2 \Omega , and 3 \Omega$ are combined in series.  If the combination is connected to a battery of emf 12 V and negligible internal resistance, the potential drop across $2 \Omega$ resistor is:

1. 2 V
2. 5 V
3. 4 V
4. 6 V

Three resistors $2 \Omega , 4\Omega , and 5 \Omega$ are combined in parallel. If the combination is connected to a battery of emf 20 V and negligible internal resistance, the total current drawn from the battery is:

1. 10 A
2. 17 A
3. 13 A
4. 19 A

At room temperature \((27~^\circ \text{C})\) the resistance of a heating element is \(100~\Omega\). What is the temperature of the element if the resistance is found to be \(117~\Omega\)? 
(Given that the temperature coefficient of the material of the resistor is \(1.70\times 10^{-4}~^{\circ}\text{C}^{-1}\))
1. \(1027~^{\circ}\text{C}\)
2. \(1007~^{\circ}\text{C}\)
3. \(1020~^{\circ}\text{C}\)
4. \(1127~^{\circ}\text{C}\)

A negligibly small current is passed through a wire of length \(15~\text{m}\) and uniform cross-section $\mathrm{}$\(6.0\times10^{-7}\) m², and its resistance is measured to be $\mathrm{}$\(5.0~\Omega.\) What is the resistivity of the material at the temperature of the experiment?

A silver wire has a resistance of $2.1 \Omega$ at $27.5 °\mathrm{C}$, and a resistance of $2.7 \Omega$ at $100 °\mathrm{C}$. The temperature coefficient of resistivity of silver is:

1.\(0.0033 \ ^{o}C^{-1}\)
2. \(0.039 \ ^{o}C^{-1}\)
3.\(0.0039 \ ^{o}C^{-1}\)  
4.\(0.033 \ ^{o}C^{-1}\)