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Current Electricity · Question 79

AIPMT 2008MCQMedium📈 Topic in 62% papers+4−1
1

[figure] In the circuit shown, the current through the 4 resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference between the points M and N is

  1. 0.5 volt
  2. 3.2 volt
  3. 1.5 volt
  4. 1.0 volt

Answer

(2) 3.2 volt

Solution

The 4 and 3 resistors are in parallel and connected directly across P and M.

VPM = 1 4 = 4 V

Lower branch: (0.5 0.5 ) in series with 1

R = 0.25 + 1 = 1.25

Current in the lower branch = 41.25 = 3.2 A

VMN = 3.2 1 = 3.2 V

Answer: (2)

AIPMT 2008

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2

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively

  1. both remain the same
  2. 1.1 times, 1.1 times
  3. 1.2 times, 1.1 times
  4. 1.21 times, same
AIPMT 2008
3

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively without and with being short circuited through a resistance of 10 . Its internal resistance is

  1. 2.0 ohm
  2. zero
  3. 1.0 ohm
  4. 0.5 ohm
AIPMT 2008
4

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20 ? The temperature of boiling water is 100

  1. 12.6 min
  2. 4.2 min
  3. 6.3 min
  4. 8.4 min
AIPMT 2008
5

A current of 3 amp. flows through the 2 resistor shown in the circuit. The power dissipated in the 5 resistor is [figure]

  1. 1 watt
  2. 5 watt
  3. 4 watt
  4. 2 watt
AIPMT 2008
6

Three resistances, P, Q, R each of 2 and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6 is connected in parallel to S the bridge gets balanced. What is the value of S?

  1. 3
  2. 6
  3. 1
  4. 2
AIPMT 2007
7

The total power dissipated in watt in the circuit shown here is [figure]

  1. 40
  2. 54
  3. 4
  4. 16
AIPMT 2007
8

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will [figure]

  1. flow from B to A
  2. flow from A to B
  3. flow in the direction which will be decided by the value of V
  4. be zero
AIPMT 2006
9

Kirchhoff's first and second laws of electrical circuits are consequences of

  1. conservation of energy and electric charge respectively
  2. conservation of energy
  3. conservation of electric charge and energy respectively
  4. conservation of electric charge
AIPMT 2006
10

Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r1 and r2 (r1 > r2) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is

  1. r1 + r2
  2. r1 - r2
  3. r1 + r22
  4. r1 - r22
AIPMT 2006
11

Power dissipated across the 8 Ω resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3 Ω resistor is [figure]

  1. 3.0
  2. 2.0
  3. 1.0
  4. 0.5
AIPMT 2006

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