AIPMT PRELIMS2008Physics-Thermodynamics
AIPMT PRELIMS 2008 Physics Heat Transfer MCQ Question
Type: MCQ-numerical-Medium-Class 11
An electric kettle takes 4 Å 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
12.6 min
B
42.4 min
C
6.3 min
D
8.4 min
Correct Answer
Option C
Detailed Explanation
The energy required to heat the water is given by Q = mcΔT. Using the power formula P = IV, we find the time by t = Q/P. Solving gives approximately 6.3 minutes.
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