# Test on power and heating effect of current

Two resistances  and  when connected in series and parallel with 120 V line, power consumed is 25 W and 100 W respectively. Then the ratio of power consumed by  to that consumed by  is :
1 : 1
1 : 2
2 : 1
1 : 4
A steel wire has a resistance twice that of an Aluminium wire. Both of them are connected with a constant voltage supply. More heat is dissipated in :
Steel wire when both are connected in series
Steel wire when both are connected in parallel
Aluminium wire when both are connected in series
Aluminium wire when both are connected in parallel
Pick out the wrong statement :
In a simple battery circuit, the point of lowest potential is the negative terminal of the battery
The resistance of an incandescent lamp is greater when the lamp is switched off
An ordinary 100 W lamp has less resistance than a 60 W lamp
At constant voltage, the heat developed in a uniform wire varies inversely as the length of the wire used
A heating coil can heat the water of a vessel from  to  in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now is (neglecting thermal capacity of the coils) :
60 minutes
30 minutes
15 minutes
7.5 minutes
Two electric bulbs rated  watt V volts and  watt V volts are connected in parallel and V volts are applied to it. The total power is :
An electric kettle has two heating coils. When one coil is used, water in the kettle boils in 5 minutes, while when second coil is used; same water boils in 10 minutes. If the two coils, connected in parallel are used simultaneously, the same water will boil in time :
3 min 20 s
5 min
7 min 30 s
2 min 30 s
Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is :
10W
5W
20W
None of the above
In the circuit shown below, the power developed in the 6( resistor is 6 watt. The power in watts developed in the 4( resistor is : 
16
9
6
4
If two bulbs of wattage 25 and 30, each rated at 220 volts, are connected in series with a 440 volt supply, which bulb will fuse?
25 W bulb
30 W bulb
Neither of them
Both of them
An electric iron draws 5 amp, a TV set draws 3 amp and refrigerator draws 2 amp from a 220 volt main line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse used may be of :
20 amp
5 amp
15 amp
10 amp
Description:

Mostly numerical questions are asked on power in electrical circuits and heating effect of current

Discussion

very faltu

3909 days 16 hours 2 minutes ago

Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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