A ball is thrown upward with velocity 30 m/s. Time to reach maximum height (g=10) is MCQ with Answer and Explanation

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A ball is thrown upward with velocity 30 m/s. Time to reach maximum height (g=10) is

A. 6 s

B. 2 s

C. 1.5 s

D. 3 s

Answer: Option D

Solution (By JKSSB Mock Tests)

v = u - gt, at top v=0 => t = u/g = 30/10 = 3 s.

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A physical quantity is measured as 12.345 ± 0.005 units. The relative error in this measurement is approximately:

A. 0.004%

B. 0.4%

C. 4%

D. 0.04%

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Correct Answer: Option D

Explanation:
Relative error = (Absolute error) / (Measured value) = 0.005 / 12.345 ≈ 0.000405. Converting to percentage: 0.000405 × 100% ≈ 0.0405% ≈ 0.04%. Relative error quantifies precision independent of measurement scale. Absolute error (±0.005) indicates instrument precision. This concept is vital for comparing measurement reliability across different magnitudes. Memory tip: Percentage error = (Absolute error / True value) × 100. Competitive exams often test this calculation with varying significant figures to assess numerical proficiency.

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