Choose the correct alternative. 1. Alloys of metals usually have less resistivity than that of their constituent metals. 2. Alloys usually have much higher temperature coefficients of resistance than pure metals. 3. The resistivity of the alloy manganin is nearly independent with an increase of temperature. 4. The resistivity of a typical insulator (e.g., amber) is less than that of a metal by a factor of the order of  10 22 / 10 23 .

Subtopic:  Derivation of Ohm's Law |
53%
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Given n resistors each of resistance R, what is the ratio of the maximum to minimum resistance?
1. $$\frac{1}{n}$$
2. $$n$$
3. $$\frac{1}{n^2}$$
4. $$n^2$$

Subtopic:  Combination of Resistors |
79%
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Given the resistances of 1Ω, 2Ω, 3Ω, how will we combine them to get an equivalent resistance of (11/3):

 1 1Ω, 2Ω in parallel and the combination in series with 3Ω 2 3Ω, 2Ω in parallel and the combination in series with 1Ω 3 1Ω, 2Ω and 3Ω in parallel 4 1Ω, 2Ω in series and the combination in parallel with 3Ω

Subtopic:  Combination of Resistors |
76%
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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

Subtopic:  Current & Current Density |
62%
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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. $$2.21~\text{A}$$

Subtopic:  Grouping of Cells |
80%
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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. $$0.5~\text{A}$$

Subtopic:  EMF & Terminal Voltage |
87%
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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
Subtopic:  EMF & Terminal Voltage |
86%
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A battery of emf 10 V and internal resistance  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

Subtopic:  EMF & Terminal Voltage |
80%
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Three resistors  are combined in series.  If the combination is connected to a battery of emf 12 V and negligible internal resistance, the potential drop across  resistor is:

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

Subtopic:  Combination of Resistors |
78%
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Three resistors  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

Subtopic:  Combination of Resistors |
79%
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