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Current Electricity
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Current Electricity
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25 Questions

1. 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]
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. A wire of resistance 4 Ω is stretched to twice itsoriginal lengthThe resistance of stretched wire wouldbe [NEET2013]
4. The rate of increase of thermo-“e.m.fwithtemperature at the neutral temperature of athermocouple [2011]
5. Si and Cu are cooled to a temperature of 300 K - then resistivity? [2001]
6. 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]
7. 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]
8. 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]
9. 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]
10. 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]
11. Fuse wire is a wire of [2003]
12. 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]
13. 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]
14. 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]
15. 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]
16. Two electric bulbs - one of 200 V - 40Wand other of200 V - 100 W are connected in a domestic circuitThen[2000]
17. 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]
18. 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]
19. 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]
20. 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]
21. A wire of a certain material is stretched slowly byten per centIts new resistance and specific resistancebecome respectively : [2008]
22. 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]
23. 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]
24. If a wire of resistance R is melted and recasted tohalf of its length - then the new resistance of the wire willbe [1995]
25. The electric resistance of a certain wire of iron is R.If its length and radius are both doubled - then [2004]

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