A ball is projected horizontally from top of a cliff. The time to hit ground depends on MCQ with Answer and Explanation

A ball is projected horizontally from top of a cliff. The time to hit ground depends on
A. Both velocity and height
B. Horizontal velocity
C. Mass of ball
D. Height of cliff and g
Answer: Option D
Solution (By JKSSB Mock Tests)
Vertical motion is independent of horizontal. t = √(2h/g). Mass doesn't affect. Horizontal velocity affects range, not time of fall. Projectile motion independence of perpendicular components.

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Practice More Physics Questions

Question #1
The recoil of a gun when a bullet is fired is an example of
A. Law of gravitation
B. Newton's second law
C. Newton's third law and conservation of momentum
D. Newton's first law

Correct Answer: Option C


Explanation:
Action-reaction and momentum conservation.

This question belongs to: Science Physics
Question #2
A radioactive substance has half-life of 10 days. Fraction remaining after 30 days is
A. 1/16
B. 1/8
C. 1/2
D. 1/4

Correct Answer: Option B


Explanation:
Number of half-lives = 30/10 = 3. Remaining = (1/2)³ = 1/8. Exponential decay N = N₀(1/2)^(t/T). Radioactive decay constant λ = ln2/T.

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Question #3
The prefix 'pico' represents
A. 10⁻¹²
B. 10⁻⁶
C. 10⁻¹⁵
D. 10⁻⁹

Correct Answer: Option A


Explanation:
pico = 10⁻¹². Femto = 10⁻¹⁵.

This question belongs to: Science Physics