100 TOP Objective Current Electricity Questions and Answers pdf

81. A rheostat differs from potentiometer in the respect that it
(a)     has lower wantage rating
(b)     has higher wattage rating
(c) has large number of turns
(d) offers large number of tappings
Ans: b

82. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
(a) 50%
(b) 60%
(c) 100%
(d) 150%
Ans: a

83. An open resistor, when checked with an ohm-meter reads
(a)     zero
(b)     infinite
(c) high but within tolerance
(d) low but not zero
Ans: b

84. are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
(a)     Varistors
(b)     Thermistor
(c) Semi-conductors
(d) Variable resistors
Ans: c

85. All good conductors have high
(a)     conductance  
(b)     resistance
(c) reluctance
(d) thermal conductivity
Ans: a

86. Voltage dependent resistors are usually made from
(a) charcoal
(b) silicon carbide
(c) nichrome
(d) graphite
Ans: c

87. Voltage dependent resistors are used
(a)     for inductive circuits
(6)     to supress surges
(c) as heating elements
(d) as current stabilizers
Ans: b

88. The ratio of mass of proton to that of electron is nearly
(a) 1840
(b) 1840
(c) 30
(d) 4
Ans: a

89. The number of electrons in the outer most orbit of carbon atom is
(a) 3
(b) 4
(c) 6
(d) 7
Ans: b

90. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
(a) 10 W
(b) 20 W
(c) 40 W
(d) 60 W
Ans: d

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