STANDARDPhysics-Mechanics
STANDARD Physics Energy Conservation MCQ Question
Type: MCQ-numerical-Hard
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 gravitational potential energy is converted into heat, and only one-quarter of this heat is absorbed by the ice. Using the energy balance equation, the height is calculated as 136 km.
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