# 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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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.
$$1127~^{\circ}\text{C}$$

Subtopic:  Heating Effects of Current |
73%
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A negligibly small current is passed through a wire of length $$15~\text{m}$$ and uniform cross-section $$6.0\times10^{-7}$$ m2, and its resistance is measured to be $$5.0~\Omega.$$ What is the resistivity of the material at the temperature of the experiment?

 1 $$1\times 10^{-7}~\Omega\text{m}$$ 2 $$2\times 10^{-7}~\Omega\text{m}$$ 3 $$3\times 10^{-7}~\Omega\text{m}$$ 4 $$1.6\times 10^{-7}~\Omega\text{m}$$
Subtopic:  Derivation of Ohm's Law |
87%
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A silver wire has a resistance of $$2.1~\Omega$$ at $$27.5^\circ \text{C},$$ and a resistance of $$2.7~\Omega$$ at $$100^\circ \text{C}.$$ The temperature coefficient of resistivity of silver is:
1. $$0.0033^\circ \text{C}^{-1}$$
2. $$0.039^\circ \text{C}^{-1}$$
3. $$0.0039^\circ \text{C}^{-1}$$
4. $$0.033^\circ \text{C}^{-1}$$

Subtopic:  Derivation of Ohm's Law |
64%
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The current drawn from a 12 V supply with internal resistance  by the infinite network (shown in the figure) is:

1. 3.12 A
2. 3.72 A
3. 2.29 A
4. 2.37 A

Subtopic:  Combination of Resistors |
66%
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Figure shows a potentiometer with a cell of 2.0 V and internal resistance 0.40 Ω maintaining a potential drop across the resistor wire AB. A standard cell which maintains a constant emf of 1.02 V (for very moderate currents up to a few mA) gives a balance point at 67.3 cm length of the wire. To ensure very low currents drawn from the standard cell, a very high resistance of 600 kΩ is put in series with it, which is shorted close to the balance point. The standard cell is then replaced by a cell of unknown emf ε and the balance point found similarly, turns out to be at 82.3 cm length of the wire. The value of ε is:

1. 1.33 V
2. 1.50 V
3. 1.24 V
4. 1.07 V

Subtopic:  Meter Bridge & Potentiometer |
56%
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Figure shows a potentiometer circuit for comparison of two resistances. The balance point with a standard resistor R=10.0 Ω is found to be 58.3 cm, while that with the unknown resistance X is 68.5 cm. The value of X is:

1. $12.1\Omega$

2.

3.

4.

Subtopic:  Meter Bridge & Potentiometer |
58%
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The figure shows a 2.0 V potentiometer used for the determination of the internal resistance of a 1.5 V cell. The balance point of the cell in the open circuit is 76.3 cm. When a resistor of 9.5 Ω is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer wire. The internal resistance of the cell is:

1. $$1.68~\Omega$$
2. $$0.13~\Omega$$
3. $$0.31~\Omega$$
4. $$1.12~\Omega$$

Subtopic:  Meter Bridge & Potentiometer |
65%
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