Current Electricity
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Current Electricity
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25 Questions

1. 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]
2. If 25W - 220 V and 100 W - 220 V bulbs areconnected in series across a 440 V line - then [2001]
3. The rate of increase of thermo-“e.m.fwithtemperature at the neutral temperature of athermocouple [2011]
4. 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]
5. 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]
6. 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]
7. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
8. 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]
9. 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]
10. A battery of 10 V and internal resistance0.5 Ω isconnected across a variable resistance RThe value of Rfor which the power delivered is maximum is equal to[1992 - 2001]
11. 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]
12. The electric resistance of a certain wire of iron is R.If its length and radius are both doubled - then [2004]
13. 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]
14. 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]
15. 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]
16. If a wire of resistance R is melted and recasted tohalf of its length - then the new resistance of the wire willbe [1995]
17. The internal resistance of a 2.1 V cell which gives acurrent of 0.2 A through a resistance of 10 Ω is[NEET2013]
18. 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]
19. 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]
20. 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]
21. A thermocouple of negligible resistance producesan e.m.fof 40 μV/°C in the linear range of temperature.A galvanometer of resistance 10 ohm whose sensitivityis 1 μA/div - is employed with the termocoupleThesmallest value of temperature difference that can bedetected by the system will be [2011M]
22. 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]
23. 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]
24. 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]
25. Two electric bulbs - one of 200 V - 40Wand other of200 V - 100 W are connected in a domestic circuitThen[2000]

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