Current Electricity
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Current Electricity
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25 Questions

1. If the resistance of a conductor is 5 Ω at 50°C and 7Ω at 100°C - then the mean temperature coefficient ofresistance (of the material) is [1996]
2. In electrolysis - the amount of mass deposited orliberated at an electrode is directly proportional to[2000]
3. A cell can be balanced against 110 cm and 100 cmof potentiometer wire - respectively with and withoutbeing short circuited through a resistance of 10 ΩItsinternal resistance is [2008]
4. Three resistances each of 4: are connected to forma triangleThe resistance between any two terminals is[1993]
5. In producing chlorine by electrolysis 100 kWpower at 125 Vis being consumedHow much chlorineper minute is liberated? (E.C.Eof chlorine is 0.367×10 -“6kg/ C) [2010]
6. Cell having an emf ε and internal resistance r isconnected across a variable external resistance RAs theresistance R is increased - the plot of potential differenceVacross Ris given by : [2012M]
7. A wire of resistance 4 Ω is stretched to twice itsoriginal lengthThe resistance of stretched wire wouldbe [NEET2013]
8. In producing chlorine through electrolysis - 100watt power at 125 Vis being consumedHow muchchlorine per minute is liberated? E.C.Eof chlorineis0.367 × 10 -“6 kg/ coulomb[2006]
9. The resistance of an ammeter is 13 Ω and its scaleis graduated for a current upto 100 ampsAfter anadditional shunt has been connected to this ammeter itbecomes possible to measure currents upto 750amperes by this meterThe value of shunt-resistance is[2007]
10. Three equal resistors connected across a source ofe.m.ftogether dissipate 10 watt of powerWhat will bethe power dissipated in watts if the same resistors areconnected in parallel across the same source of e.m.f.?[1998]
11. The rate of increase of thermo-“e.m.fwithtemperature at the neutral temperature of athermocouple [2011]
12. Two 220 volt - 100 watt bulbs are connected first inseries and then in parallelEach time the combination isconnected to a 220 volt a.csupply lineThe powerdrawn by the combination in each case respectively willbe [2003]
13. If 25W - 220 V and 100 W - 220 V bulbs areconnected in series across a 440 V line - then [2001]
14. In a metre-bridge - the balancing length from theleft end when standard resistance of 1 Ω is in right gap isfound to be 20 cmThe value of unknown resistance is[1999]
15. Two electric bulbs - one of 200 V - 40Wand other of200 V - 100 W are connected in a domestic circuitThen[2000]
16. The resistivity (specific resistance) of a copperwire [2002]
17. An electric kettle has two heating coilsWhen oneof the coils is connected to an a.csource - the water inthe kettle boils in 10 minutesWhen the other coil isused - the water boils in 40 minutesIf both the coils areconnected in parallel - the time taken by the samequantity of water to boil will be [2003]
18. If specific resistance of a potentiometer wire is 10 -“7 Ω m - the current flow through it is 0.1 A and the crosssectional area of wire is 10 -“6 m2 then potential gradientwill be [2001]
19. Fuse wire is a wire of [2003]
20. A current of 2A flows through a 2 Ω resistor whenconnected across a batteryThe same battery supplies acurrent of 0.5 A when connected across a 9Ω resistor.The internal resistance of the battery is [2011]
21. The velocity of charge carriers of current (about 1amp) in a metal under normal conditions is of the orderof [1991]
22. If a wire of resistance R is melted and recasted tohalf of its length - then the new resistance of the wire willbe [1995]
23. The internal resistance of a 2.1 V cell which gives acurrent of 0.2 A through a resistance of 10 Ω is[NEET2013]
24. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
25. A 5-“ampere fuse wire can withstand a maximumpower of 1 watt in the circuitThe resistance of the fusewire is [2005]

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