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21. On a bulb is written 220 volt and 60 watt. Find out the resistance of the bulb and the value of the current flowing through it. (NTSE West Bengal, Stage-I, 2013-14)
806.66 ohm, 0.27 ampere
500 ohm, 2 ampere
200 ohm, 4 ampere
100 ohm, 1 ampere
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22. The value of current I and voltage V in the given circuit will be (NTSE Rajasthan, Stage-I, 2013-14)
2 A, 4 V
4 A, 2 V
1 A, 2 V
2 A, 1 V
23. Three equal resistors connected in series across a source of (V) voltage together dissipates 5 W power. If the same resistors are connected in parallel across the same source of voltage V, the power dissipated will be (NTSE Rajasthan, Stage-I, 2013-14)
20 W
25 W
40 W
45 W
24. A uniform wire when connected directly across a 220 V line produces heat H per second. If the wire is divided into n-parts and all parts are connected in parallel across a 220 V line, the heat produced per second will be (NTSE Haryana, Stage-I, 2013-14)
n2H
nH
25. A circuit is shown in the figure. If switch'S' is closed, the reading of an ammeter(A) (NTSE Andhra Pradesh, Stage-I, 2014-15)
Does not change
Increase
Decrease
May increase or decrease
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