The potential difference VB-VA between points A and B  in the figure is?  if R=0.7 Ω and i = 3 is

1.  3 V

2.  15 V

3.  5.1 V

4.  +5.1 V

Subtopic:  Kirchoff's Voltage Law |
 67%
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A set of '\(n\)' equal resistors, of value '\(R\)' each, are connected in series to a battery of emf '\(E\)' and internal resistance '\(R\)'. The current drawn is \(I.\) Now, if '\(n\)' resistors are connected in parallel to the same battery, then the current drawn becomes \(10I.\) The value of '\(n\)' is:

1. \(10\) 2. \(11\)
3. \(20\) 4. \(9\)
Subtopic:  EMF & Terminal Voltage |
 73%
From NCERT
NEET - 2018
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The resistance of a wire is \(R~\Omega\). If it is melted and stretched \(n\) times its original length, its new resistance will be:
1. \(\frac{R}{n}\)
2. \(n^{2}R\)
3. \(\frac{R}{n^{2}}\)
4. \(nR\)
Subtopic:  Combination of Resistors |
 77%
From NCERT
NEET - 2017
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A carbon resistor (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be:

1. Violet - Yellow - Orange - Silver

2. Yellow - Violet - Orange - Silver

3. Yellow - Green - Violet - Gold

4. Green - Orange - Violet - Gold

Subtopic:  Colour Coding of Resistors (OLD NCERT) |
 83%
From NCERT
NEET - 2018
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The figure shows a circuit that contains three identical resistors with resistance \(R = 9.0~\Omega\) each, two identical inductors with inductance \(L = 2.0~\text{mH}\) each, and an ideal battery with emf \(\varepsilon = 18~\text{V}\). The current \('i'\) through the battery just after the switch is closed will be:
  
1. \(0.2~\text{A}\)
2. \(2~\text{A}\)
3. \(4~\text{A}\)
4. \(2~\text{mA}\)

Subtopic:  RC Circuit (OLD NCERT) |
From NCERT
NEET - 2017
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The potential difference \(V_\mathrm{A}-V_\mathrm{B}\) between the points \(\mathrm{A}\) and \(\mathrm{B}\) in the given figure is:
    

1. \(-3~\text{V}\) 2. \(+3~\text{V}\)
3. \(+6~\text{V}\) 4. \(+9~\text{V}\)

Subtopic:  Kirchoff's Voltage Law |
 77%
From NCERT
NEET - 2016
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A filament bulb (\(500\) W, \(100\) V) is to be used in a \(230\) V main supply. When a resistance\(R\) is connected in series, the bulb works perfectly and consumes \(500\) W. The value of \(R\) is:

1. \(230\) Ω 2. \(46\) Ω
3. \(26\) Ω 4. \(13\) Ω
Subtopic:  Heating Effects of Current |
 67%
From NCERT
NEET - 2016
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The charge flowing through a resistance \(R\) varies with time \(t\) as \(Q=at-bt^2,\) where \(a\) and \(b\) are positive constants. The total heat produced in \(R\) is:
1. a3R3b
2. a3R2b
3. a3Rb
4. a3R6b
Subtopic:  Heating Effects of Current |
 57%
From NCERT
NEET - 2016
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Assertion : Electric conduction in gases is possible at normal pressure.
Reason : The electric conduction in gases depends only upon the potential difference between the electrodes.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Two metal wires of identical dimensions are connected in series. If \(\sigma_1\) and \(\sigma_2\) are the conductivities of the metal wires respectively, the effective conductivity of the combination is:

1. \(\frac{2\sigma_1 \sigma_2}{\sigma_1+\sigma_2}\) 2. \(\frac{\sigma_1 +\sigma_2}{2\sigma_1\sigma_2}\)
3. \(\frac{\sigma_1 +\sigma_2}{\sigma_1\sigma_2}\) 4. \(\frac{\sigma_1 \sigma_2}{\sigma_1+\sigma_2}\)

Subtopic:  Derivation of Ohm's Law |
 63%
From NCERT
NEET - 2015
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