Current Electricity Objective type Questions and Answers pdf

61. A glass rod when rubbed with silk cloth is charged because
(a) it takes in proton
(b) its atoms are removed
(c) it gives away electrons
(d) it gives away positive charge
Ans: c

62. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.
(a) Reactor
(b) Capacitor
(c) Inductor
(d) Resistor
Ans: d

63. It becomes more difficult to remove
(a) any electron from the orbit
(6) first electron from the orbit
(c) second electron from the orbit
(d) third electron from the orbit
Ans: d

64. When one leg of parallel circuit is opened out the total current will
(a) reduce
(b) increase
(c) decrease
(d) become zero
Ans: c

65. In a lamp load when more than one lamp are switched on the total resistance of the load
(a)     increases
(b)     decreases
(c) remains same
(d) none of the above
Ans: b

66. Two lamps 100 W and 40 W are connected in series across 230 V (alternating).
 Which of the following statement is correct ?
(a)     100 W lamp will glow brighter
(b)     40 W lamp will glow brighter
(c) Both lamps will glow equally bright
(d) 40 W lamp will fuse
Ans: b

67. Resistance of 220 V, 100 W lamp will be
(a) 4.84 Q
(b) 48.4 Q
(c) 484 ft
(d) 4840 Q
Ans: c

68. In the case of direct current
(a) magnitude and direction of current remains constant
(b) magnitude and direction of current changes with time
(c) magnitude of current changes with time
(d) magnitude of current remains con¬stant
Ans: a

69. When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is
(a)     A.C.
(b)     D.C.
(c) any of above two
(d) none of the above
Ans: b

70. Resistance of carbon filament lamp as the applied voltage increases.
(a)     increases
(b)     decreases
(c) remains same
(d) none of the above
Ans: b