An unknown resistance R1 is connected in series with a resistance of 10 Ω. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 Ω resistance is removed the balance point shifts to 40 cm. The value of R1 is (in ohm

(1) 60

(2) 40

(3) 20

(4) 10

Subtopic:  Meter Bridge & Potentiometer |
 75%
From NCERT
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A wire has a resistance of 6 Ω. It is cut into two parts and both half values are connected in parallel. The new resistance is :

(1) 12 Ω

(2) 1.5 Ω

(3) 3 Ω

(4) 6 Ω

Subtopic:  Combination of Resistors |
 87%
From NCERT
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Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between

(1) P and Q

(2) Q and R

(3) P and R

(4) Any two points

Subtopic:  Combination of Resistors |
 82%
From NCERT
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The total current supplied to the circuit by the battery is:

      

1. 1 A

2. 2 A

3. 4 A

4. 6 A

Subtopic:  Combination of Resistors |
 65%
From NCERT
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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be 

(1) 3

(2) 1/3

(3) 8/9

(4) 2

Subtopic:  Combination of Resistors |
 69%
From NCERT
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In circuit shown below, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3 volt. The voltage across the resistance R4 is:

1. 0.4 V

2. 0.6 V

3. 1.2 V

4. 1.5 V

Subtopic:  Kirchoff's Voltage Law |
 59%
From NCERT
PMT - 2004
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If you are provided three resistances 2 Ω, 3 Ω and 6 Ω. How will you connect them so as to obtain the equivalent resistance of 4 Ω 

(1)

(2)

(3)

(4) None of these

Subtopic:  Combination of Resistors |
 88%
From NCERT
PMT - 2003
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The equivalent resistance and potential difference between A and B for the circuit is respectively 

(1) 4 Ω, 8 V

(2) 8 Ω, 4 V

(3) 2 Ω, 2 V

(4) 16 Ω, 8 V

Subtopic:  Combination of Resistors |
 91%
From NCERT
PMT - 2003
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Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be 

(1) 3VR

(2) VR

(3) V2R

(4) 2VR

Subtopic:  Combination of Resistors |
From NCERT
PMT - 2004
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For the network shown in the figure the value of the current i is 

(1) 9V35

(2) 5V18

(3) 5V9

(4) 18V5

Subtopic:  Wheatstone Bridge |
 78%
From NCERT
PMT - 2005
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