Questions on Current Electricity Multiple choice Questions and Answers pdf

101. A thermistor has
(a) positive temperature coefficient
(b) negative temperature coefficient
(c) zero temperature coefficient
(d) variable temperature coefficient
Ans: c

102. If/, R and t are the current, resistance and time respectively, then according to Joule's law heat produced will be proportional to
(a) I2Rt
(b) I2Rf
(c) I2R2t
(d) I2R2t*
Ans: a

103. Nichrome wire is an alloy of
(a) lead and zinc
(b) chromium and vanadium
(c) nickel and chromium
(d) copper and silver
Ans: c

104. When a voltage of one volt is applied, a circuit allows one microampere current to flow through it. The conductance of the circuit is
(a)     1 n-mho
(b)     106 mho
(c)   1 milli-mho
(d)   none of the above
Ans: a

105. Which of the following can have negative temperature coefficient ?
(a) Compounds of silver
(6) Liquid metals
(c) Metallic alloys
(d) Electrolytes
Ans: d

106. Conductance : mho ::
(a)     resistance : ohm
(b)     capacitance : henry
(c) inductance : farad
(d) lumen : steradian
Ans: a

107. 1 angstrom is equal to
(a) 10-8 mm
(6) 10"6 cm
(c) 10"10 m
(d) 10~14 m
Ans: c

108. One newton metre is same as
(a) one watt
(b) one joule
(c) five joules
(d) one joule second
Ans: b

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