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Current Electricity · Question 109

AIPMT 2000MCQEasy📈 Topic in 62% papers+4−1
1

The net resistance of the circuit between A and B is [figure]

  1. 83
  2. 143
  3. 163
  4. 223

Answer

(2) 143

Solution

The network is a Wheatstone bridge with arms 3 , 4 (upper) and 6 , 8 (lower), and 7 in the middle.

36 = 48 = 12, the bridge is balanced, so no current flows through the 7 resistor; it can be removed.

Upper branch: 3 + 4 = 7 ; lower branch: 6 + 8 = 14

RAB = 7 147 + 14

= 9821 = 143

Answer: (2)

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2

A car battery of emf 12 V and internal resistance 5 10-2 , receives a current of 60 amp, from external source, then terminal potential difference of battery is

  1. 12 V
  2. 9 V
  3. 15 V
  4. 20 V
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3

Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistances

  1. R40 < R100
  2. R40 > R100
  3. R40 = R100
  4. no relation can be predicted.
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4

The potentiometer is best for measuring voltage, as

  1. it has a sensitive galvanometer and gives null deflection
  2. it has wire of high resistance
  3. it measures p.d. in closed circuit
  4. it measures p.d. in open circuit.
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