NEET2016Physics-Heat Transfer
NEET 2016 Physics Heat Transfer MCQ Question
Type: MCQ-numerical-Hard-Class 11
A piece of ice falls from a height h so that it melts completely. Only one – quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is (Latent heat of ice is 3.4 × 10⁵ J/kg and g = 10 N/kg)
A
136 km
B
68 km
C
34 km
D
544 km
Correct Answer
Option A
Detailed Explanation
The potential energy converted to heat is mgh. Only one-quarter is absorbed, so mgh/4 = mL. Solving gives h = 4L/g = 136 km.
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