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Current Electricity · Question 102

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

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

Answer

(1) 8 minutes

Solution

Heat needed H is the same: H = V2Rt

⇒ R t, i.e. R1 10, R2 40

In parallel: 1Rp = 1R1 + 1R2

⇒ 1tp = 1t1 + 1t2 = 110 + 140 = 540

∴ tp = 8 minutes

Answer: (1)

AIPMT 2003

Keep practising — Current Electricity

2

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
3

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
4

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
5

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
6

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
7

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
8

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

  1. 83
  2. 143
  3. 163
  4. 223
AIPMT 2000
9

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
10

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
11

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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