1.

If a given volume of water in a `220 V` heater is boiled in `5 min`, then how much time will it take for the same volume of water in a `110 V` heater to be boiled?A. 20 minB. 30 minC. 25 minD. 40 min

Answer» Correct Answer - A
`H=(V_(2))/(R)t" "because H="same,R =same"`
`rArrt prop(1)/(V^(2))rArrt=4t = 20min.`


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