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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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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\(\mathrm{A, B}~\text{and}~\mathrm{C}\) are voltmeters of resistance \(R\), \(1.5R\) and \(3R\) respectively as shown in the figure above. When some potential difference is applied between \(\mathrm{X}\) and \(\mathrm{Y}\), the voltmeter readings are \({V}_\mathrm{A}\), \({V}_\mathrm{B}\) and \({V}_\mathrm{C}\) respectively. Then:

       

1. \({V}_\mathrm{A} ={V}_\mathrm{B}={V}_\mathrm{C}\) 2. \({V}_\mathrm{A} \neq{V}_\text{B}={V}_\mathrm{C}\)
3. \({V}_\mathrm{A} ={V}_\mathrm{B}\neq{V}_\mathrm{C}\) 4. \({V}_\mathrm{A} \ne{V}_\mathrm{B}\ne{V}_\mathrm{C}\)

Subtopic:  Kirchoff's Voltage Law |
 65%
From NCERT
NEET - 2015
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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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The figure given below shows a circuit when resistances in the two arms of the meter bridge are \(5~\Omega\) and \(R\), respectively. When the resistance \(R\) is shunted with equal resistance, the new balance point is at \(1.6l_1\). The resistance \(R\) is: 
           
1. \(10~\Omega\)
2. \(15~\Omega\)
3. \(20~\Omega\)
4. \(25~\Omega\)

Subtopic:  Meter Bridge & Potentiometer |
 72%
From NCERT
AIPMT - 2014
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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 |
 77%
From NCERT
AIPMT - 2013
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