Current Electricity
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Current Electricity
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1. A battery is charged at a potential of 15V for 8hours when the current flowing is 10AThe battery ondischarge supplies a current of 5A for 15 hoursThemean terminal voltage during discharge is 14VThe-œwatt-hour- efficiency of the battery is [2004]
2. 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]
3. If voltage across a bulb rated 220 Volt-100 Wattdrops by 2.5% of its rated value - the percentage of therated value by which the power would decrease is :[2012]
4. Three resistances each of 4: are connected to forma triangleThe resistance between any two terminals is[1993]
5. 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]
6. A heating coil is labelled 100 W - 220 VThe coil iscut in half and the two pieces are joined in parallel to thesame sourceThe energy now liberated per second is[1995]
7. If a wire of resistance R is melted and recasted tohalf of its length - then the new resistance of the wire willbe [1995]
8. Three resistances P - Q - Reach of 2Ω and anunknown resistance S form the four arms of aWheatstone bridge circuitWhen a resistance of 6Ω isconnected in parallel to S the bridge gets balancedWhatis the value of S? [2007]
9. 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]
10. If nearly 10 5 coulombs liberate 1 gm-equivalent ofaluminium - then the amount of aluminium (equivalentweight 9) - deposited through electrolysis in 20 minutesby a current of 50 ampwill be [1998]
11. 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]
12. Two cells - having the same e.m.f- are connected inseries through an external resistance RCells haveinternal resistances r 1 and r2 (r1 > r2) respectivelyWhenthe circuit is closed - the potential difference across thefirst cell is zeroThe value of R is [2006][2007]
13. The internal resistance of a 2.1 V cell which gives acurrent of 0.2 A through a resistance of 10 Ω is[NEET2013]
14. A galvanometer of resistance 50 Ω is connected tobattery of 3V along with a resistance of 2950 Ω in series.A full scale deflection of 30 divisions is obtained in thegalvanometerIn order to reduce this deflection to 20divisions - the resistance in series should be [2008]
15. 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]
16. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
17. The electric resistance of a certain wire of iron is R.If its length and radius are both doubled - then [2004]
18. If a negligibly small current is passed through awire of length 15 m and of resistance 5 Ω having uniformcross-section of 6 × 10 -“7 m2 - then coefficient ofresistivity of material - is [1996]
19. 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]
20. The velocity of charge carriers of current (about 1amp) in a metal under normal conditions is of the orderof [1991]
21. A 5-“ampere fuse wire can withstand a maximumpower of 1 watt in the circuitThe resistance of the fusewire is [2005]
22. The resistivity (specific resistance) of a copperwire [2002]
23. 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]
24. 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]
25. 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]

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