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Current Electricity
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Current Electricity
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25 Questions

1. 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]
2. 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]
3. 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]
4. The resistivity (specific resistance) of a copperwire [2002]
5. Two electric bulbs - one of 200 V - 40Wand other of200 V - 100 W are connected in a domestic circuitThen[2000]
6. 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]
7. Fuse wire is a wire of [2003]
8. 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]
9. A wire of a certain material is stretched slowly byten per centIts new resistance and specific resistancebecome respectively : [2008]
10. 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]
11. 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]
12. 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]
13. If a wire of resistance R is melted and recasted tohalf of its length - then the new resistance of the wire willbe [1995]
14. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
15. 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]
16. Direct current is passed through a copper sulphatesolution using platinum electrodesThe elementsliberated at the electrodes are [1993]
17. 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]
18. Three resistances each of 4: are connected to forma triangleThe resistance between any two terminals is[1993]
19. The electric resistance of a certain wire of iron is R.If its length and radius are both doubled - then [2004]
20. A wire of resistance 4 Ω is stretched to twice itsoriginal lengthThe resistance of stretched wire wouldbe [NEET2013]
21. 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]
22. 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]
23. The rate of increase of thermo-“e.m.fwithtemperature at the neutral temperature of athermocouple [2011]
24. 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]
25. 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]

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