# The value of $$R$$ for which power in it is maximum is:         1. $$3~\Omega$$ 2. $$6~\Omega$$ 3. $$12~\Omega$$ 4. $$9~\Omega$$

Subtopic:  Heating Effects of Current |
76%
From NCERT
AIPMT - 1999
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The terminal potential difference of a cell is greater than its emf when:

 1 A battery of less emf is connected in its series. 2 A battery of higher emf is connected in its series. 3 A battery of higher emf is connected in its parallel. 4 A battery of less emf is connected in its parallel.
Subtopic:  EMF & Terminal Voltage |
From NCERT
AIPMT - 1999
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In India electricity is supplied for domestic use at $$220$$ V. It is supplied at $$110$$ V in the USA. If the resistance of a $$60$$ W bulb for use in India is $$R$$, the resistance of a $$60$$ W bulb for use in the USA will be:

 1 $$2R$$ 2 $$\dfrac{R}{4}$$ 3 $$\dfrac{R}{2}$$ 4 $$R$$
Subtopic:  Heating Effects of Current |
81%
From NCERT
AIPMT - 2004
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A battery is charged at a potential of $$15$$ V for $$8$$ hours when the current flowing is $$10$$ A. The battery on discharge supplies a current of $$5$$ A for $$15$$ hours. The mean terminal voltage during discharges is $$14$$ V. The "Watt hour" efficiency of the battery is:
1. $$80\%$$
2. $$90\%$$
3. $$87.5\%$$
4. $$82.5\%$$

Subtopic:  EMF & Terminal Voltage |
68%
From NCERT
AIPMT - 2004
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Five equal resistances each of resistance $$R$$ are connected as shown in the figure below. A battery of $$V$$ volts is connected between $$A$$ and $$B$$. The current flowing in $$AFCEB$$ will be:

1. $$\frac{V}{R}$$
2. $$\frac{V}{2R}$$
3. $$\frac{2V}{R}$$
4. $$\frac{3V}{R}$$

Subtopic:  Wheatstone Bridge |
57%
From NCERT
AIPMT - 2004
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A $$6$$-volt battery is connected to the terminals of a three-metre-long wire of uniform thickness and resistance of $$100$$ ohms. The difference of potential between two points on the wire separated by a distance of $$50$$ cm will be:
1. $$3$$ V
2. $$1$$ V
3. $$1.5$$ V
4. $$2$$ V

Subtopic:  Derivation of Ohm's Law |
71%
From NCERT
AIPMT - 2004
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The specific resistance of a conductor increases with:

 1 increase in temperature. 2 increase in cross-section area. 3 increase in cross-section and decrease in length. 4 decrease in cross-section area.

Subtopic:  Derivation of Ohm's Law |
79%
From NCERT
AIPMT - 2002
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For a cell, the terminal potential difference is $$2.2$$ V when the circuit is open and reduces to $$1.8$$ V when the cell is connected to the resistance of $$R = 5~\Omega$$. The internal resistance of cell ($$r$$) is:

 1 $$\dfrac{10}{9}~ \Omega$$ 2 $$\dfrac{9}{10}~ \Omega$$ 3 $$\dfrac{11}{9}~ \Omega$$ 4 $$\dfrac{5}{9}~ \Omega$$
Subtopic:  EMF & Terminal Voltage |
72%
From NCERT
AIPMT - 2002
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If the specific resistance of a potentiometer wire is ${10}^{-7}$ $\Omega m$ and the current flow through it is 0.1 A, the cross-sectional area of the wire is  ${10}^{-6}$ ${m}^{2}$, then potential gradient will be:

1. ${10}^{-2}$ $V/m$

2. ${10}^{-4}$ $V/m$

3. ${10}^{-6}$ $V/m$

4. ${10}^{-8}$ $V/m$

Subtopic:  Meter Bridge & Potentiometer |
77%
From NCERT
AIPMT - 2001
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The resistance of each arm of the wheat stone bridge is $$10~ \Omega.$$ A resistance of $$10~ \Omega$$ is connected in series with a galvanometer. The equivalent resistance across the battery will be:
1.$$10~ \Omega$$
2.$$15~ \Omega$$
3. $$20~ \Omega$$
4. $$40~ \Omega$$

Subtopic:  Wheatstone Bridge |
79%
From NCERT
AIPMT - 2001
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