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Current Electricity
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Current Electricity
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25 Questions

1. 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]
2. 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]
3. 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]
4. 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]
5. 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]
6. The internal resistance of a 2.1 V cell which gives acurrent of 0.2 A through a resistance of 10 Ω is[NEET2013]
7. 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]
8. 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]
9. 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]
10. Si and Cu are cooled to a temperature of 300 K - then resistivity? [2001]
11. 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]
12. n equal resistors are first connected in series andthen connected in parallelWhat is the ratio of themaximum to the minimum resistance? [1989]
13. The rate of increase of thermo-“e.m.fwithtemperature at the neutral temperature of athermocouple [2011]
14. A 5-“ampere fuse wire can withstand a maximumpower of 1 watt in the circuitThe resistance of the fusewire is [2005]
15. 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]
16. Three resistances each of 4: are connected to forma triangleThe resistance between any two terminals is[1993]
17. Two electric bulbs - one of 200 V - 40Wand other of200 V - 100 W are connected in a domestic circuitThen[2000]
18. 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]
19. In electrolysis - the amount of mass deposited orliberated at an electrode is directly proportional to[2000]
20. Fuse wire is a wire of [2003]
21. A 6 volt battery is connected to the terminals of thethree metre long wire of uniform thickness andresistance of 100 ohmThe difference of potentialbetween two points on the wire separated by a distanceof 50 cm will be [2004]
22. 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]
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. 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]
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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