AIPMT MAIN2008Physics-Thermodynamics
AIPMT MAIN 2008 Physics Heat Transfer MCQ Question
Type: MCQ-numerical-Medium-Class 11
An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C.
A
4.2 min
B
6.3 min
C
8.4 min
Correct Answer
Option B
Detailed Explanation
The energy required to heat the water is calculated using Q = mcΔT. The power of the kettle is P = IV = 4 Å × 220 V = 880 W. Time is calculated using t = Q/P.
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