Realtime Current Electricity Multiple choice Questions and Answers pdf

21. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect
(a) two in parallel
(b) two in parallel and one in series
(c) three in parallel
(d) three in series
Ans: b

22. Two resistors are said to be connected in series when
(a) same current passes in turn through both
(b) both carry the same value of current
(c) total current equals the sum of branch currents
(d) sum of IR drops equals the applied e.m.f.
Ans: a

23. Which of the following statement is true both for a series and a parallel D.C. circuit?
(a) Elements have individual currents
(b) Currents are additive
(c) Voltages are additive
(d) Power are additive
Ans: d

24. Which of the following materials has a negative temperature co-efficient of resistance?
(a) Copper
(b) Aluminum
(c) Carbon
(d) Brass
Ans: c

25. Ohm's law is not applicable to
(a) vacuum tubes
(b) carbon resistors
(c) high voltage circuits
(d) circuits with low current densities
Ans: a

26. Which is the best conductor of electricity ?
(a) Iron
(b) Silver
(c) Copper
(d) Carbon
Ans: b

27. For which of the following 'ampere second' could be the unit ?
(a) Reluctance    
(b) Charge
(c) Power
(d) Energy
Ans: b

28. All of the following are equivalent to watt except
(a) (amperes)  ohm
(b) joules/sec.
(c)     amperes x volts
(d) amperes/volt
Ans: d

29. A resistance having rating 10 ohms, 10W is likely to be a
(a)     metallic resistor
(b)     carbon resistor
(c) wire wound resistor
(d) variable resistor
Ans: c

30. Which one of the following does not have negative temperature co-efficient ?
(a) Aluminium    
(b) Paper
(c) Rubber
(d) Mica
Ans: a

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