Most recently Current Electricity Multiple choice Questions and Answers pdf

41. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
(a) 0.4 ohm
(b) 0.6 ohm
(c) 0.8 ohm
(d) 1.0 ohm
Ans: a

42. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
(a) there will be heavy current in the main line
(b) rest of the two bulbs will not light
(c) all three bulbs will light
(d) the other two bulbs will light
Ans: d

43. The four bulbs of 40 W each are connected in series wifti a battery across them, which of the following statement is true ?
(a) The current through each bulb in same
(b) The voltage across each bulb is not same
(c) The power dissipation in each bulb is not same
(d) None of the above
Ans: a

44. Two resistances Rl and Ri are connected in series across the voltage source where R2>Ri. The largest drop will be across
(a) R2
(b) Ri
(c) either Rl or Rz
(d) none of them
Ans: a

45. What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal ?
(a) 5 joules
(b) 10 joules
(c) 15 joules
(d) 20 joules
Ans:

46. A closed switch has a resistance of
(a) zero
(b) about 50 ohms
(c) about 500 ohms
(d) infinity
Ans: a

47. The hot resistance of the bulb's fila¬ment is higher than its cold resistance because the temperature co-efficient of the filament is
(a)     zero
(b)     negative
(c) positive
(d) about 2 ohms per degree
Ans: c

48. Heat in a conductor is produced on the passage of electric current due to
(a) reactance
(b) capacitance
(c) impedance
(d) resistance
Ans:

49. The insulation on a current carrying conductor is provided
(a)     to prevent leakage of current
(b)     to prevent shock
(c) both of above factors
(d) none of above factors
Ans: c

50. The thickness of insulation provided on the conductor depends on
(a) the magnitude of voltage on the con-ductor
(b) the magnitude of current flowing through it
(c) both (a) and (b)
(d) none of the above
Ans: a

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