The potential drop across the 3Ω resistor is 

(1) 1 V

(2) 1.5 V

(3) 2 V

(4) 3 V

Subtopic:  Combination of Resistors |
 68%
From NCERT
PMT - 2000
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If each resistance in the figure is 9 Ω, then the reading of the ammeter is:

1. 5 A

2. 8 A

3. 2 A

4. 9 A

Subtopic:  Combination of Resistors |
 60%
From NCERT
PMT - 2000
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Two wires of equal diameters, of resistivities ρ1 and ρ2 and lengths l1 and l2, respectively, are joined in series. The equivalent resistivity of the combination is :

(1) ρ1l1+ρ2l2l1+l2

(2) ρ1l2+ρ2l1l1l2

(3) ρ1l2+ρ2l1l1+l2

(4) ρ1l1ρ2l2l1l2 

Subtopic:  Derivation of Ohm's Law |
 78%
From NCERT
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Four resistances of 100 Ω each are connected in the form of square. Then, the effective resistance along the diagonal points is :

(1) 200 Ω

(2) 400 Ω

(3) 100 Ω

(4) 150 Ω

Subtopic:  Combination of Resistors |
 88%
From NCERT
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Equivalent resistance between the points A and B is (in Ω) 

(1) 15

(2) 114

(3) 213

(4) 312

Subtopic:  Combination of Resistors |
 76%
From NCERT
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In the circuit shown here, what is the value of the unknown resistor R so that the total resistance of the circuit between points P and Q is also equal to

(1) 3 ohms

(2) 39ohms

(3) 69ohms

(4) 10 ohms

Subtopic:  Combination of Resistors | Wheatstone Bridge |
 76%
From NCERT
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The resistors of resistances 2 Ω, 4 Ω and 8 Ω are connected in parallel, then the equivalent resistance of the combination will be :

(1) 87Ω

(2) 78Ω

(3) 74Ω

(4) 49Ω 

Subtopic:  Combination of Resistors |
 84%
From NCERT
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In the circuit, the potential difference across PQ will be nearest to 

(1) 9.6 V

(2) 6.6 V

(3) 4.8 V

(4) 3.2 V

Subtopic:  EMF & Terminal Voltage |
 71%
From NCERT
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Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms, 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be 

(1) 32

(2) 64

(3) 50

(4) 200

Subtopic:  Combination of Resistors |
 78%
From NCERT
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Equivalent resistance across terminals A and B will be:

        

1. 1 Ω

2. 2 Ω

3. 3 Ω

4. 4 Ω

Subtopic:  Combination of Resistors |
 71%
From NCERT
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