Latest Current Electricity Multiple choice Questions and Answers pdf

31. Varistors are
(a)     insulators
(6)     non-linear resistors
(c) carbon resistors
(d) resistors with zero temperature coefficient
Ans: b

32. 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
Ans: b

33. The rating of a fuse wire is always expressed in
(a) ampere-hours
(b) ampere-volts
(c) kWh
(d) amperes
Ans: d

34. 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 (#) zero
Ans: b

35. 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
Ans: d

36. The filament of an electric bulb is made of
(a) carbon
(b) aluminium
(c) tungsten
(d) nickel
Ans: c

37. A 3 Q resistor having 2 A current will dissipate the power of
(a) 2 watts
(b) 4 watts
(c) 6 watts
(d) 8 watts
Ans: c

38. Which of the following statement is true?
(a) A galvanometer with low resistance in parallel is a voltmeter
(b) A galvanometer with high resis¬tance in parallel is a voltmeter
(c) A galvanometer with low resistance in series is an ammeter
(d)     A galvanometer with high resis¬tance in series is an ammeter
Ans: c

39. The resistance of a few metres of wire conductor in closed electrical circuit is
(a) practically zero
(b) low
(c) high
(d) very high
Ans: a

40. 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
Ans: c

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