The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then :

(1) The resistance will be doubled and the specific resistance will be halved

(2) The resistance will be halved and the specific resistance will remain unchanged

(3) The resistance will be halved and the specific resistance will be doubled

(4) The resistance and the specific resistance, will both remain unchanged

Subtopic:  Derivation of Ohm's Law |
 80%
From NCERT
PMT - 2004
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The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance :

(1) Length = 50 cm, diameter = 0.5 mm

(2) Length = 100 cm, diameter = 1 mm

(3) Length = 200 cm, diameter = 2 mm

(4) Length = 300 cm, diameter = 3 mm

Subtopic:  Derivation of Ohm's Law |
 71%
From NCERT
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The potential difference between points A and B of the adjoining figure is

(1) 23V

(2) 89V

(3) 43V

(4) 2 V

Subtopic:  Combination of Resistors |
 57%
PMT - 1991
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Two resistors of resistance R1 and R2 having R1 > R2 are connected in parallel. For equivalent resistance R, the correct statement is :

(1) R>R1+R2

(2) R1<R<R2

(3) R2<R<(R1+R2)

(4) R < R1

Subtopic:  Combination of Resistors |
 66%
From NCERT
PMT - 1978
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A wire of resistance \(R\) is divided into \(10\) equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be:
1. \(0.01R\)
2. \(0.1R\)
3. \(10R\)
4. \(100R\)

Subtopic:  Combination of Resistors |
 64%
From NCERT
PMT - 1973
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Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be 

(1) 4/3 ohm

(2) 3/4 ohm

(3) 3 ohm

(4) 6 ohm

Subtopic:  Combination of Resistors |
 83%
From NCERT
PMT - 1983
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There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be :

(1) x/n2

(2) n2x

(3) x/n

(4) nx

Subtopic:  Combination of Resistors |
 80%
From NCERT
PMT - 2004
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Equivalent resistance between A and B will be 

(1) 2 ohm

(2) 18 ohm

(3) 6 ohm

(4) 3.6 ohm

Subtopic:  Combination of Resistors |
 77%
From NCERT
PMT - 1981
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Referring to the figure below, the effective resistance of the network is 

(1) 2r

(2) 4r

(3) 10r

(4) 5r/2

Subtopic:  Combination of Resistors |
 90%
From NCERT
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Two resistances are joined in parallel whose resultant is 68 ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was 

(1) 3/5

(2) 2

(3) 6/5

(4) 3

Subtopic:  Combination of Resistors |
 79%
From NCERT
PMT - 1976
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