Physics-Temperature & Heat
NEET Physics Temperature & Heat MCQ Question
Type: MCQ-diagram based-Easy-Class 11
Consider a scenario where a 10 kW drilling machine is used to drill a bore in a small aluminum block of mass 8.0 kg. The machine operates for 2.5 minutes, and 50% of the power is used in heating the block. Based on this information, what is the increase in temperature of the aluminum block? Assume the specific heat capacity of aluminum is 0.91 J g⁻¹ K⁻¹.
A
68.75 K
B
34.38 K
C
137.5 K
D
27.5 K
Correct Answer
Option B
Detailed Explanation
The heat energy absorbed by the block is calculated using Q = mcΔT. With 50% of power used, the energy is (10 kW * 0.5 * 2.5 * 60 s). Converting mass to grams and using specific heat, ΔT = Q/(mc) gives 34.38 K.
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