A stone is dropped from a height of 80 m. Time to reach ground (g=10) is MCQ with Answer and Explanation

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A stone is dropped from a height of 80 m. Time to reach ground (g=10) is

A. 8 s

B. 2 s

C. 16 s

D. 4 s

Answer: Option D

Solution (By JKSSB Mock Tests)

h = ½gt² => 80 = 5t² => t²=16 => t=4 s.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1

1 kWh of energy equals

A. 3.6 × 10³ J

B. 3.6 × 10⁸ J

C. 3.6 × 10⁶ J

D. 3.6 J

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Correct Answer: Option C

Explanation:
1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J. Important conversion.

This question belongs to: Science Physics

Question #2

A wire of resistance 6 Ω is stretched to thrice its original length. New resistance is

A. 54 Ω

B. 36 Ω

C. 2 Ω

D. 18 Ω

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Correct Answer: Option A

Explanation:
R ∝ L² (volume constant). L'=3L => R' = 3² × 6 = 9×6 = 54 Ω. Generally, R' = n² R for stretching n times. Important concept.

This question belongs to: Science Physics

Question #3

The terminal potential difference of a cell is less than its emf due to

A. Overcharging

B. External resistance

C. Internal resistance

D. Low temperature

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Correct Answer: Option C

Explanation:
V = E - Ir, drop across internal resistance.

This question belongs to: Science Physics

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