Paper 1 · People, Development and Environment
Assertion (A): Calorific value is basically about fuel efficiency; fuel efficiency is measured by calorific value. Reason (R): Calorific value is the amount of heat energy present in food or fuel, determined by the complete combustion of a specified quantity at constant pressure in normal conditions, and its unit is kilojoule per kilogram. Choose the correct answer.
ABoth (A) and (R) are true and (R) is the correct explanation of (A) ✓ Correct
BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
C(A) is true, but (R) is false
D(A) is false, but (R) is true
Correct answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A) — Both (A) and (R) are true, and (R) correctly explains (A), so that is the answer.
Explanation
★Both (A) and (R) are true, and (R) correctly explains (A), so that is the answer.
★The assertion says fuel efficiency is measured by calorific value.
★The reason defines calorific value as the heat energy released on complete combustion.
★This heat released is exactly the measure of how efficient a fuel is.
★So the reason explains why calorific value measures fuel efficiency.
★So both are true and (R) is the correct explanation of (A).
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