Current Electricity MCQ with Answers PDF
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Current Electricity MCQ with Answers PDF
41. Varistors are
- (A) insulators
- (B) non-linear resistors
- (C) carbon resistors
- (D) resistors with zero temperature co-efficient
Show Answer
(B) non-linear resistors
42. Insulating materials have the function of
- (A) preventing a short circuit between conducting wires
- (B) preventing an open circuit between the voltage source and the load
- (C) conducting very large currents
- (D) storing very high currents
Show Answer
(A) preventing a short circuit between conducting wires
43. The rating of a fuse wire is always expressed in
- (A) ampere-hours
- (B) ampere-volts
- (C) kWh
- (D) amperes
Show Answer
(D) amperes
44. The minimum charge on an ion is--
- (A) equal to the atomic number of the atom
- (B) equal to the charge of an electron
- (C) equal to the charge of the number of electrons in an atom
- (D) Zero
Show Answer
(B) equal to the charge of an electron
45. In a series circuit with unequal resistances
- (A) the highest resistance has the most of the current through it
- (B) the lowest resistance has the highest voltage drop
- (C) the lowest resistance has the highest current
- (D) the highest resistance has the highest voltage drop
Show Answer
(D) the highest resistance has the highest voltage drop
46. The filament of an electric bulb is made of
- (A) carbon
- (B) aluminium
- (C) tungsten
- (D) nickel
Show Answer
(C) tungsten
47. A 3Ω resistor having 2 A current will dissipate the power of
- (A) 2 watts
- (B) 4 watts
- (C) 6 watts
- (D) 8 watts
Show Answer
(C) 6 watts
48. Which of the following statement is true ?
- (A) A galvanometer with low resistance in parallel is a voltmeter
- (B) A galvanometer with high resistance in parallel is a voltmeter
- (C) A galvanometer with low resistance in series is an ammeter
- (D) A galvanometer with high resistance in series is an ammeter
Show Answer
(C) A galvanometer with low resistance in series is an ammeter
49. The resistance of a few metres of wire conductor in closed electrical circuit is
- (A) practically zero
- (B) low
- (C) high
- (D) very high
Show Answer
(A) practically zero
50. If a parallel circuit is opened in the main line, the current
- (A) increases in the branch of the lowest resistance
- (B) increases in each branch
- (C) is zero in all branches
- (D) is zero in the highest resistive branch
Show Answer
(C) is zero in all branches
51. If a wire conductor of 0.2 ohm resis-tance is doubled in length, its resistance becomes
- (A) 0.4 ohm
- (B) 0.6 ohm
- (C) 0.8 ohm
- (D) 1.0 ohm
Show Answer
(A) 0.4 ohm
52. Three 60W 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
Show Answer
(D) the other two bulbs will light
53. The four bulbs of 40 W each are connected in series with 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
Show Answer
(A) The current through each bulb in same
54. Two resistances R1 and R2 are connected in series across the voltage source where R2> R1. The largest drop will be across
- (A) R2
- (B) R1
- (C) R12
- (D) None
Show Answer
(A) R2
55. What will be energy used by the batteg if the battery has to drive 6.28 x 108 electrons with potential difference of 20 V across the terminal ?
- (A) 5 joules
- (B) 10 joules
- (C) 15 joules
- (D) 20 joules
Show Answer
(D) 20 joules
56. A closed switch has a resistance of
- (A) zero
- (B) about 50 ohms
- (C) about 600 ohms
- (D) infinity
Show Answer
(A) zero
57. The hot resistance of the bulb's filament 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
Show Answer
(C) positive
58. Heat in a conductor is produced on the passage of electric current due to
- (A) reactance
- (B) capacitance
- (C) impedance
- (D) resistance
Show Answer
(D) resistance
59. 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
Show Answer
(C) both of above factors
60. The thickness of insulation provided on the conductor depends on
- (A) the magnitude of voltage on the conductor
- (B) the magnitude of current flowing through it
- (C) both (a) and (b)
- (D) none of the above
Show Answer
(A) the magnitude of voltage on the conductor
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