According to Joule's law of heating, the heat produced in a resistor is directly proportional to the square of: MCQ with Answer and Explanation
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Question #1
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Half-life 5 days. Fraction remaining after 15 days:
Correct Answer: Option C
Explanation:
Number of half-lives n = 15/5 = 3. Fraction = (1/2)³ = 1/8. Exponential decay: N = N₀(1/2)^(t/T). Memory aid: 'After n half-lives: fraction = 1/2ⁿ'. Radioactivity calculation frequently tested in competitive exams with simple half-life arithmetic.
Number of half-lives n = 15/5 = 3. Fraction = (1/2)³ = 1/8. Exponential decay: N = N₀(1/2)^(t/T). Memory aid: 'After n half-lives: fraction = 1/2ⁿ'. Radioactivity calculation frequently tested in competitive exams with simple half-life arithmetic.
Question #2
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The law of inertia was given by
Question #3
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A ship floats because its density is
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