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Current Electricity · Question 107

AIPMT 2001MCQEasy📈 Topic in 62% papers+4−1
1

The resistance of each arm of the Wheatstone's bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent resistance across the battery will be

  1. 10 ohm
  2. 15 ohm
  3. 20 ohm
  4. 40 ohm

Answer

(1) 10 ohm

Solution

All four arms are equal (10 each), so PQ = RS and the bridge is balanced.

No current flows through the galvanometer branch, so it (with its series 10 ) can be removed.

Remaining: two branches of (10 + 10) = 20 each in parallel.

Req = 20 2020 + 20

= 10

Answer: (1)

AIPMT 2001

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2

If specific resistance of a potentiometer wire is 10-7 m and current flow through it is 0.1 amp., cross-sectional area of wire is 10-6 m2 then potential gradient will be

  1. 10-2 volt/m
  2. 10-4 volt/m
  3. 10-6 volt/m
  4. 10-8 volt/m
AIPMT 2001
3

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

  1. 83
  2. 143
  3. 163
  4. 223
AIPMT 2000
4

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
AIPMT 2000
5

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.
AIPMT 2000
6

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.
AIPMT 2000

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