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Current Electricity · Question 110

AIPMT 2000MCQEasy📈 Topic in 38% papers+4−1
1

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

Answer

(3) 15 V

Solution

The battery receives current from an external source, i.e. it is being charged (current enters at the positive terminal).

While charging: V = E + Ir

= 12 + 60 5 10-2

= 12 + 3 = 15 V

Answer: (3)

AIPMT 2000

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2

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
3

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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