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mediumQ. No. 15110-how-many-joules-are-equal-to-1-kilocalorie
How many joules are equal to 1 kilocalorie?
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A4.186 J
B418.6 J
C4186 J
D41860 J
Correct Answer: 4186 JYour Answer: C
Explanation
The relationship between kilocalorie and joule is fundamental in thermodynamics. Option A (4.186 J) is incorrect — this is the value of 1 calorie (not 1 kilocalorie) in joules. 1 calorie = 4.186 joules. Option B (418.6 J) is incorrect — this is not a standard conversion value. Option C (4186 J) is CORRECT — 1 kilocalorie (kcal) = 1000 calories, and since 1 calorie = 4.186 joules, therefore 1 kcal = 1000 × 4.186 = 4186 joules. This can also be written as 4.186 × 10³ joules. Option D (41860 J) is incorrect — this is 10 times the correct answer. This conversion (1 kcal = 4186 J or 4.186 × 10³ J) is frequently asked in competitive exams. The value J = 4.186 joules/calorie is called the mechanical equivalent of heat and was first determined by James Prescott Joule through paddle-wheel experiments.
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