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Current Electricity · Question 73

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

Consider the following two statements. Which of the following is correct?

  1. Both (A) and (B) are wrong
  2. (A) is correct and (B) is wrong
  3. (A) is wrong and (B) is correct
  4. Both (A) and (B) are correct

Answer

(4) Both (A) and (B) are correct

Solution

Junction rule: the sum of currents entering a junction equals the sum leaving it — charge does not accumulate at a junction. ⇒ It follows from conservation of charge, so (A) is correct.

Loop rule: the algebraic sum of potential changes around a closed loop is zero — the net work done on a charge taken round a closed loop is zero. ⇒ It follows from conservation of energy, so (B) is correct.

Both (A) and (B) are correct.

Answer: (4)

AIPMT 2010 (Prelims)

Keep practising — Current Electricity

2

A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at length l1 cm and l2 cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to [figure]

  1. k(l2 - l1) and kl2
  2. kl1 and k(l2 - l1)
  3. k(l2 - l1) and kl1
  4. kl1 and kl2
AIPMT 2010 (Prelims)
3

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ? [figure]

  1. 2 - i2r2 - 1 - i1r1 = 0
  2. - 2 - (i1 + i2)R + i2r2 = 0
  3. 1 - (i1 + i2)R + i1r1 = 0
  4. 1 - (i1 + i2)R - i1r1 = 0
AIPMT 2009
4

A wire of resistance 12 ohms per metre is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure is [figure]

  1. 3
  2. 6
  3. 6
  4. 0.6
AIPMT 2009
5

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
AIPMT 2009
6

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
7

[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
8

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
9

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
10

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
11

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

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