Hiried Current Electricity Multiple choice Questions and Answers pdf

51. Which of the following quantities remain the same in all parts of a series circuit ?
(a) Voltage
(b) Current
(c) Power
(d) Resistance
Ans: b

52. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will
(a)     decrease
(b)     increase
(c) remain same
(d) heater will burn out
Ans: b

53. In an electric kettle water boils in 10m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
(a)     length of heating element should be decreased
(b)     length of heating element should be increased
(c) length of heating element has no effect on heating if water
(d) none of the above
Ans: a

54. An electric filament bulb can be worked from
(a) D.C. supply only
(b) A.C. supply only
(c)     Battery supply only
(d)     All above
Ans: d

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

56. Electric current passing through the circuit produces
(a)     magnetic effect
(b)     luminous effect
(c)     thermal effect
(d)     chemical effect
(e) all above effects
Ans: c

57. Resistance of a material always decreases if
(a)     temperature of material is decreased
(6)     temperature of material is increased
(c) number of free electrons available become more
(d) none of the above is correct
Ans: c

58. If the efficiency of a machine is to be high, what should be low ?
(a)     Input power
(b)     Losses
(c) True component of power
(d) kWh consumed
(e) Ratio of output to input
Ans: b

59. When electric current passes through a metallic conductor, its temperature rises. This is due to
(a)     collisions between conduction electrons and atoms
(b) the release of conduction electrons from parent atoms
(c) mutual collisions between metal atoms
(d) mutual collisions between conducting electrons
Ans: a

60. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
(a) 4 : 25
(b) 25 : 4
(c) 2 : 5
(d) 5 : 2
Ans: c

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