Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is:
1. current density 2. current
3. drift velocity 4. electric field

Subtopic:  Current & Current Density |
 59%
From NCERT
NEET - 2015
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Two cities are \(150~\text{km}\) apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is \(8\) volts and the average resistance per km is \(0.5~\text{ohm}\). The power loss in the wire is:
1. \(19.2~\text{W}\)
2. \(19.2~\text{kW}\)
3. \(19.2~\text{J}\)
4. \(12.2~\text{kW}\)

Subtopic:  Heating Effects of Current |
 82%
From NCERT
AIPMT - 2014
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A wire of resistance \(4~\Omega\) is stretched to twice its original length. The resistance of a stretched wire would be:
1. \(4~\Omega\)
2. \(8~\Omega\)
3. \(16~\Omega\)
4. \(2~\Omega\)

Subtopic:  Derivation of Ohm's Law |
 82%
From NCERT
AIPMT - 2013
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Internal resistance of a \(2.1~\text{V}\) cell which gives a current of \(0.2~\text{A}\) through a resistance of \(10~\Omega\) is:
1. \(0.5~\Omega\)
2. \(0.8~\Omega\)
3. \(1.0~\Omega\)
4. \(0.2~\Omega\)
Subtopic:  EMF & Terminal Voltage |
 83%
From NCERT
AIPMT - 2013
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The resistances of the four arms \(P,Q,R~\text{and}~S\) in a Wheatstone’s bridge are \(10~\Omega,30~\Omega,30~\Omega\) and \(90~\Omega\) respectively. The emf and internal resistance of the cell are \(7~\text{volt}\) and \(5~\Omega\) respectively. If the galvanometer resistance is \(50~\Omega\) the current drawn from the cell will be:
1. \(0.2~\text{A}\)
2. \(0.1~\text{A}\)
3. \(2.0~\text{A}\)
4. \(1.0~\text{A}\)
 
 
Subtopic:  Wheatstone Bridge |
 76%
From NCERT
AIPMT - 2013
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If the voltage across a bulb rated \((220~\text{V}\text-100~\text{W})\) drops by \(2.5\%\) of its rated value, the percentage of the rated value by which the power would decrease is:
1. \(20\%\)
2. \(2.5\%\)
3. \(5\%\)
4. \(10\%\)

Subtopic:  Heating Effects of Current |
 77%
From NCERT
AIPMT - 2012
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A ring is made of a wire having a resistance of \(R_0=12~\Omega.\). Find points \(\mathrm{A}\) and \(\mathrm{B}\), as shown in the figure, at which a current-carrying conductor should be connected so that the resistance \(R\) of the subcircuit between these points equals \(\frac{8}{3}~\Omega\)?
               
1. \(\frac{l_1}{l_2} = \frac{5}{8}\)
2. \(\frac{l_1}{l_2} = \frac{1}{3}\)
3. \(\frac{l_1}{l_2} = \frac{3}{8}\)
4. \(\frac{l_1}{l_2} = \frac{1}{2}\)

Subtopic:  Combination of Resistors |
 51%
From NCERT
AIPMT - 2012
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If power dissipated in the \(9~\Omega\) resistor in the circuit shown is \(36\) W, the potential difference across the \(2~\Omega\) resistor will be:

            

1. \(8\) V
2. \(10\) V
3. \(2\) V
4. \(4\) V

Subtopic:  Heating Effects of Current |
 78%
From NCERT
AIPMT - 2011
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A current of \(2~\text{A}\) flows through a \(2~\Omega\) resistor when connected across a battery. The same battery supplies a current of \(0.5~\text{A}\) when connected across a \(9~\Omega\) resistor. The internal resistance of the battery is:
1. \(\frac{1}{3}~\Omega\)
2. \(\frac{1}{4}~\Omega\)
3. \(1~\Omega\)
4. \(0.5~\Omega\)

Subtopic:  EMF & Terminal Voltage |
 78%
From NCERT
AIPMT - 2011
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Given below two statements:
Statement I: Kirchhoff’s junction law follows the conservation of charge. 
Statement II: Kirchhoff’s loop law follows the conservation of energy.
1. Both Statement I and Statement II are incorrect.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect and Statement II is correct.
4. Both Statement I and Statement II are correct.
Subtopic:  Kirchoff's Voltage Law |
 82%
From NCERT
AIPMT - 2010
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