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Current Electricity · Question 77

AIPMT 2009MCQEasy📈 Topic in 38% papers+4−1
1

A student measures the terminal potential difference (V) of a cell (of emf and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I, then respectively, equal

  1. -r and
  2. r and -
  3. - and r
  4. and -r

Answer

(1) -r and

Solution

Terminal potential difference of a cell delivering current I:

V = - Ir

V = (-r)I +

Comparing with y = mx + c: slope = -r and intercept =

Answer: (1)

AIPMT 2009

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2

The mean free path of electrons in a metal is 4 10-8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m

  1. 5 10-11
  2. 8 10-11
  3. 5 107
  4. 8 107
AIPMT 2009
3

[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
AIPMT 2008
4

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
5

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
6

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
7

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
8

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
9

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

  1. 40
  2. 54
  3. 4
  4. 16
AIPMT 2007
10

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
11

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

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