Test: Current Electricity (December 7) - NEET MCQ
15 Questions MCQ Test - Test: Current Electricity (December 7)
Two electric bulbs, one of 200 V, 40W and otherof 200 V, 100W are connected in a domesticcircuit. Then [2000]
Five resistances have been connected as shown in the figure. The effective resistance between A and B is
, so the 7Ω resistance is
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Si and Cu are cooled to a temperature of 300 K,then resistivity? [2001]
A battery of 10 V and internal resistance 0.5Ω isconnected across a variable resistance R. Thevalue of R for which the power delivered ismaximum is equal to [1992, 2001]
Two 220 volt, 100 watt bulbs are connected firstin series and then in parallel. Each time thecombination is connected to a 220 volt a.c.supply line. The power drawn by thecombination in each case respectively will be [2003]
In a Wheatstone’s bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is [2003]
A car battery has e.m.f. 12 volt and internalresistance 5 × 10–2 ohm. If it draws 60 amp current,the terminal voltage of the battery will be [2000]
An electric kettle has two heating coils. Whenone of the coils is connected to an a.c. source,the water in the kettle boils in 10 minutes. Whenthe other coil is used, the water boils in 40minutes. If both the coils are connected inparallel, the time taken by the same quantity ofwater to boil will be [2003]
In a metre-bridge, the balancing length from theleft end when standard resistance of 1 Ω is inright gap is found to be 20 cm. The value ofunknown resistance is [1999]
where r is resistance of wire
When three identical bulbs of 60 watt, 200 voltrating are connected in series to a 200 voltsupply, the power drawn by them will be [2004]
Resistances n, each of r ohm, when connectedin parallel give an equivalent resistance of Rohm. If these resistances were connected inseries, the combination would have a resistancein ohms, equal to [2004]
Potentiometer measures potential moreaccurately because [2000]
A battery is charged at a potential of 15V for 8hours when the current flowing is 10A. Thebattery on discharge supplies a current of 5Afor 15 hours. The mean terminal voltage duringdischarge is 14V. The “watt-hour” efficiency ofthe battery is [2004]
For the network shown in the Fig. the value of the current i is [2005]
The electric resistance of a certain wire of iron isR. If its length and radius are both doubled, then
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