Electricity

MCQs Part 6

36. In the figure shown below the e.m.f. of the cell is 2 V and internal resistance is negligible. The reading of voltmetre will be

  1. 2.00 volt
  2. 1.33 volt
  3. 1.60 volt
  4. 0.80 volt

37. In the followign figure, current through 3W resistor is 0.8 amp; then the potential drop through 4W resistor is

  1. 9.6 V
  2. 2.6 V
  3. 4.8 V
  4. 1.2 V

38. The value of internal resistance of an ideal cell is:

  1. Zero
  2. 0.5 W
  3. 1 W
  4. Infinite

39. A cell of emf `E' os cpmmected acrpss a resostamce R. The potential difference between the terminals of the cells is found to be V. the internal resistance of the cell must be:

  4. (E_V)R

40. A cell of emf E xhaving an internal resistance r is connected to an external resistance R. The potential difference V across the resistance R varies with R as shown in Fig. by the curve:

  1. A
  2. B
  3. C
  4. D

Answer: 36. (a), 37. (b), 38. (a), 39. (c), 40. (b)

41. A 50 V battery is connected across a 10 W resistor. The current is 4.5 ampere. The internal resistance of the battery is:

  1. Zero
  2. 0.5 W
  3. 1.1W
  4. 5.0 W

42. The internal ressistance of a cell of emf 2 V is 0.1 ohm. It is connected to a resistance of 2.9 ohm. The voltage across the cell will be (in volt):

  1. 0.5
  2. 1.90
  3. 1.95
  4. 2.0

43. A current of 2.0 A passes through a cell of emf 1.5 V having internal resistance of 0.15 W. The potential difference across the terminals of the cell in volt is:

  1. 1.35
  2. 1.5
  3. 1.95
  4. 1.20

44. A bettery of emf 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it maximum is given by:

  1. 2.0 W
  2. 0.25 W
  3. 1.0 W
  4. 0.5 W

45. Two cells of same emf E but of different internal resistance r1 and r2 are connected in series with an external resistance R. The potential drop across the first cell is foundto be zero. The external resistance R is:

  1. r1 + r2
  2. r1_ r2
  3. r2 _ r1
  4. r1r2

Answer: 41. (c), 42. (c), 43. (d), 44. (d), 45. (b)

46. Resistance as shown in Fig 10.109. is negative at:

  1. A
  2. B
  3. C
  4. None of these

47. Resistances of 1, 2 and 3 ohm are connected in the form of a triangle. If a 1.5 volt cell of negligible internal resistance is connected across the 3 ohm resistance, the current flowing through this resistance will be:

  1. 0.25 ampere
  2. 0.5 ampere
  3. 1.0 ampere
  4. 1.5 ampere

48. The current through the circuit shown in Fig. is 1 A. If each of the 4 W resistor is replaced by 2 W ressistor, the current in circuit will become nearly:

  1. 1.11 A
  2. 1.25 A
  3. 1.34 A
  4. 1.68 A

49. The current flowing through 3 ohm resistor is 0.8 ampere, the potential drop across the 4 W resistor

  1. 1.6 V
  2. 2.4 V
  3. 4.8 V
  4. 9.6 V

50. In the circuit shown in Fig., what will be the reading of the ammeter?

  1. 0.36 ampere
  2. 0.50 ampere
  3. 2.0 ampere
  4. 4.5 ampere

Answer: 46. (a), 47. (b), 48. (a), 49. (c), 50. (b)

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