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Current Electricity · Question 101

AIPMT 2003MCQEasy📈 Topic in 38% papers+4−1
1

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be

  1. 50 watt, 100 watt
  2. 100 watt, 50 watt
  3. 200 watt, 150 watt
  4. 50 watt, 200 watt

Answer

(4) 50 watt, 200 watt

Solution

Resistance of each bulb: R = V2P = 2202100 = 484

Series: Ps = V22R = 1002 = 50 W

Parallel: each bulb gets its rated 220 V

⇒ Pp = 100 + 100 = 200 W

Answer: (4)

AIPMT 2003

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2

An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be

  1. 8 minutes
  2. 4 minutes
  3. 25 minutes
  4. 15 minutes
AIPMT 2003
3

Fuse wire is a wire of

  1. high resistance and high melting point
  2. high resistance and low melting point
  3. low resistance and low melting point
  4. low resistance and high melting point
AIPMT 2003
4

For a cell terminal potential difference is 2.2 V when circuit is open and reduces to 1.8 V when cell is connected to a resistance of R = 5 . Determine internal resistance of cell (r)

  1. 109
  2. 910
  3. 119
  4. 59
AIPMT 2002
5

Specific resistance of a conductor increases with

  1. increase in temperature
  2. increase in cross-section area
  3. increase in cross-section and decrease in length
  4. decrease in cross-section area.
AIPMT 2002
6

Copper and silicon are cooled from 300 K to 60 K, the specific resistance

  1. decrease in copper but increase in silicon
  2. increase in copper but decrease in silicon
  3. increase in both
  4. decrease in both
AIPMT 2001
7

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
AIPMT 2001
8

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
9

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

  1. 83
  2. 143
  3. 163
  4. 223
AIPMT 2000
10

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
11

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

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