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Current Electricity · Question 90

AIPMT 2005MCQMedium📈 Topic in 0% papers+4−1
1

Two batteries, one of emf 18 volts and internal resistance 2 and the other of emf 12 volts and internal resistance 1 , are connected as shown. The voltmeter V will record a reading of [figure]

  1. 30 volt
  2. 18 volt
  3. 15 volt
  4. 14 volt

Answer

(4) 14 volt

Solution

The positive terminals of both cells are joined together, so the cells are in parallel and the ideal voltmeter reads the common terminal voltage.

As per NCERT, eq = 1 r2 + 2 r1r1 + r2

= 18 1 + 12 22 + 1

= 423 = 14 V

Answer: (4)

AIPMT 2005

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2

When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, the resistance between any two diametrically opposite points will be

  1. R/4
  2. 4R
  3. R/8
  4. R/2
AIPMT 2005
3

For the network shown in the figure the value of the current i is [figure]

  1. 9V35
  2. 18V5
  3. 5V9
  4. 5V18
AIPMT 2005
4

A 5-ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is

  1. 0.04 ohm
  2. 0.2 ohm
  3. 5 ohm
  4. 0.4 ohm
AIPMT 2005
5

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then

  1. The resistance will be doubled and the specific resistance will be halved.
  2. The resistance will be halved and the specific resistance will remain unchanged.
  3. The resistance will be halved and the specific resistance will be doubled.
  4. The resistance and the specific resistance, will both remain unchanged.
AIPMT 2004
6

Resistances n, each of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances were connected in series, the combination would have a resistance in ohms, equal to

  1. n2R
  2. R/n2
  3. R/n
  4. nR
AIPMT 2004
7

Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be [figure]

  1. 3VR
  2. VR
  3. V2R
  4. 2VR
AIPMT 2004
8

A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 cm will be

  1. 2 volt
  2. 3 volt
  3. 1 volt
  4. 1.5 volt
AIPMT 2004
9

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

  1. 60 watt
  2. 180 watt
  3. 10 watt
  4. 20 watt
AIPMT 2004
10

In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be

  1. R
  2. 2R
  3. R/4
  4. R/2
AIPMT 2004
11

In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is

  1. R/4
  2. R/2
  3. R
  4. 2R
AIPMT 2003

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