There are three resistance coils of equal resistance. The maximum number of resistances you can obtain by connecting them in any manner you choose, being free to use any number of the coils in any way is :

(1) 3

(2) 4

(3) 6

(4) 5

Subtopic:  Combination of Resistors |
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If in the circuit shown below, the internal resistance of the battery is 1.5 Ω and VP and VQ are the potentials at P and Q respectively, what is the potential difference between the points P and Q 

(1) Zero

(2) 4 volts (VP > VQ)

(3) 4 volts (VQ > VP)

(4) 2.5 volts (VQ > VP)

Subtopic:  Kirchoff's Voltage Law |
 58%
From NCERT
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Two wires of resistance R1 and R2 have temperature coefficient of resistance α1 and α2, respectively. These are joined in series. The effective temperature coefficient of resistance is :

(1) α1+α22

(2) α1α2

(3) α1R1+α2R2R1+R2

(4) R1R2α1α2R12+R22

Subtopic:  Combination of Resistors |
 75%
From NCERT
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Two cells of equal e.m.f. and of internal resistances, r1, and r2(r1>r2) are connected in series. On connecting this combination to an external resistance R, it is observed that the potential difference across the first cell becomes zero. The value of R will be :

(1) r1+r2

(2) r1r2

(3) r1+r22

(4) r1r22

Subtopic:  Grouping of Cells |
 71%
From NCERT
PMT - 2005
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When connected across the terminals of a cell, a voltmeter measures 5V and a connected ammeter measures 10 A of current. A resistance of 2 ohms is connected across the terminals of the cell. The current flowing through this resistance will be :

(1) 2.5 A

(2) 2.0 A

(3) 5.0 A

(4) 7.5 A

Subtopic:  Kirchoff's Voltage Law |
 59%
From NCERT
PMT - 1997
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In the circuit shown here, E1 = E2 = E3 = 2 V and R1 = R2 = 4 ohms. The current flowing between points A and B through battery E2 is 

(1) Zero

(2) 2 amp from A to B

(3) 2 amp from B to A

(4) None of the above

Subtopic:  Grouping of Cells |
 52%
From NCERT
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In the circuit shown below, \(E_1 = 4.0~\text{V}\), \(R_1 = 2~\Omega\)\(E_2 = 6.0~\text{V}\), \(R_2 = 4~\Omega\) and \(R_3 = 2~\Omega\). The current \(I_1\) is:

    

1. \(1.6\) A

2. \(1.8\) A

3. \(1.25\) A

4. \(1.0\) A

Subtopic:  Grouping of Cells |
 53%
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The potential difference across \(8\) ohms resistance is \(48\) volts as shown in the figure below. The value of potential difference across \(X\) and \(Y\) points will be:

   
1. \(160\) volt
2. \(128\) volt
3. \(80\) volt
4. \(62\) volt

Subtopic:  Kirchoff's Voltage Law |
 62%
From NCERT
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Two resistances R1 and R2 are made of different materials. The temperature coefficient of the material of R1 is α and of the material of R2 is –β. The resistance of the series combination of R1 and R2 will not change with temperature, if R1/ R2 equals :

(1) αβ

(2) α+βαβ

(3) α2+β2αβ

(4) βα

Subtopic:  Derivation of Ohm's Law |
 57%
From NCERT
PMT - 1997
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An ionization chamber with parallel conducting plates as anode and cathode has 5×107 electrons and the same number of singly-charged positive ions per cm3. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 4μA/m2. The velocity of positive ions moving towards cathode is :

(1) 0.4 m/s

(2) 16 m/s

(3) Zero

(4) 0.1 m/s

Subtopic:  Current & Current Density |
From NCERT
PMT - 1992
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