Current Electricity
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Current Electricity
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1. 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]
2. 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]
3. 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]
4. 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]
5. 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]
6. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
7. The electric resistance of a certain wire of iron is R.If its length and radius are both doubled - then [2004]
8. The resistivity (specific resistance) of a copperwire [2002]
9. 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]
10. Direct current is passed through a copper sulphatesolution using platinum electrodesThe elementsliberated at the electrodes are [1993]
11. A wire of a certain material is stretched slowly byten per centIts new resistance and specific resistancebecome respectively : [2008]
12. 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]
13. 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]
14. 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]
15. 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]
16. 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]
17. 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]
18. 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]
19. 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]
20. 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]
21. The velocity of charge carriers of current (about 1amp) in a metal under normal conditions is of the orderof [1991]
22. 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]
23. 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]
24. 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]
25. 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]

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