\(\mathrm{A, B}~\text{and}~\mathrm{C}\) 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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If power dissipated in the 9 Ω resistor in the circuit shown is 36 W, the potential difference across the 2 Ω 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 A flows through a 2 Ω resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 Ω resistor. The internal resistance of the battery is:

1.  1/3 Ω

2.  1/4 Ω

3.  1 Ω

4.  0.5 Ω

Subtopic:  EMF & Terminal Voltage |
 78%
From NCERT
AIPMT - 2011
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The rate of increase of thermo-emf with the temperature at the neutral temperature of a thermocouple:
 
1. is zero.
2. depends upon the choice of the two materials of the thermocouple.
3. is negative.
4. is positive.
Subtopic:  Heating Effects of Current |
AIPMT - 2011
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See the electrical circuit shown in this figure. Which of the following is a correct equation for it?
                                  

1. \(\varepsilon_1-(i_1+i_2)R-i_1r_1=0\)
2. \(\varepsilon_2-i_2r_2-\varepsilon_1-i_1r_1=0\)
3. \(-\varepsilon_2-(i_1+i_2)R+i_2r_2=0\)
4. \(\varepsilon_1-(i_1+i_2)R+i_1r_1=0\)

Subtopic:  Kirchoff's Voltage Law |
 71%
From NCERT
AIPMT - 2009
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A current of \(3~\text{A}\) flows through the \(2~\Omega\) resistor shown in the circuit. The power dissipated in the \(5~\Omega\) resistor is:
    

1. \(4~\text{W}\) 2. \(2~\text{W}\)
3. \(1~\text{W}\) 4. \(5~\text{W}\)
Subtopic:  Heating Effects of Current |
 80%
From NCERT
AIPMT - 2008
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The total power dissipated in watts in the circuit shown below is:

1. 16 W 2. 40 W
3. 54 W 4. 4 W
Subtopic:  Heating Effects of Current |
 87%
From NCERT
AIPMT - 2007
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