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Current Electricity
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Current Electricity
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25 Questions

1. The velocity of charge carriers of current (about 1amp) in a metal under normal conditions is of the orderof [1991]
2. Fuse wire is a wire of [2003]
3. Three resistances each of 4: are connected to forma triangleThe resistance between any two terminals is[1993]
4. When three identical bulbs of 60 watt - 200 voltrating are connected in series to a 200 volt supply - thepower drawn by them will be [2004]
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. When a wire of uniform cross-“section a - length land resistance R is bent into a complete circle - resistancebetween any two of diametrically opposite points will be[2005]
7. Direct current is passed through a copper sulphatesolution using platinum electrodesThe elementsliberated at the electrodes are [1993]
8. In India electricity is supplied for domestic use at220 VIt is supplied at 110 Vin USAIf the resistance of a60 W bulb for use in India is R - the resistance of a 60 Wbulb for use in USA will be [2004]
9. 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]
10. 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]
11. If 25W - 220 V and 100 W - 220 V bulbs areconnected in series across a 440 V line - then [2001]
12. A 5°C rise in temperature is observed in aconductor by passing a currentWhen the current isdoubled the rise in temperature will be approximately[1998]
13. 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]
14. 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]
15. Si and Cu are cooled to a temperature of 300 K - then resistivity? [2001]
16. A wire has a resistance of 3.1 Ω at 30°C and aresistance 4.5 Ω at 100°CThe temperature coefficient ofresistance of the wire [2001]
17. 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]
18. The potential difference between the terminals of acell in an open circuit is 2.2 VWhen a resistor of 5 Ω isconnected across the terminals of the cell - the potentialdifference between the terminals of the cell is found tobe 1.8 VThe internal resistance of the cell is [2002]
19. A wire of a certain material is stretched slowly byten per centIts new resistance and specific resistancebecome respectively : [2008]
20. 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]
21. The masses of the three wires of copper are inthe ratio of 1: 3: 5 and their lengths are in the ratio of 5:3:The ratio of their electrical resistance is [1988]
22. Two identical batteries each of e.m.f 2V and internalresistance 1Ω are available to produce heat in anexternal resistance by passing a current through itThemaximum power that can be developed across R usingthese batteries is [1990]
23. The electric resistance of a certain wire of iron is R.If its length and radius are both doubled - then [2004]
24. Two wires of the same metal have same length - buttheir cross-sections are in the ratio 3 ΩThey are joinedin seriesThe resistance of thicker wire is 10 ΩThe totalresistance of the combination will be [1995]
25. 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]

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