# In a potentiometer arrangement, a cell of emf $$1.25$$ V gives a balance point at $$35.0$$ cm length of the wire. If the cell is replaced by another cell and the balance point shifts to $$63.0$$ cm, then the emf of the second cell is: 1. $$1.27$$ V 2. $$2.25$$ V 3. $$3.27$$ V 4. $$3.25$$ V

Subtopic:  Meter Bridge & Potentiometer |
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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 |
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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 |
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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 |
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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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