Projectile horizontal range maximum at angle: MCQ with Answer and Explanation

Projectile horizontal range maximum at angle:
A. 60°
B. 90°
C. 30°
D. 45°
Answer: Option D
Solution (By JKExamLibrary)
Range R = u²sin(2θ)/g. sin(2θ) maximum (=1) when 2θ=90° ⇒ θ=45°. Standard result for level ground projection. Memory aid: 'Max range at 45°; max height at 90°'. Projectile motion fact frequently tested in competitive exams.

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Question #1 Report Error
An echo is heard after 2 seconds from a cliff. If speed of sound is 340 m/s, distance of cliff is
A. 340 m
B. 510 m
C. 680 m
D. 170 m

Correct Answer: Option A


Explanation:
Sound travels to cliff and back. Total distance = speed × time = 340 × 2 = 680 m. So distance to cliff = 680/2 = 340 m. Use formula d = (v × t)/2. Time for round trip. Minimum distance for echo 17 m (approx) for 0.1 s persistence.

This question belongs to: Science Physics
Question #2 Report Error
The law of conservation of energy states that
A. Energy can be destroyed but not created
B. Energy can neither be created nor destroyed, only transformed
C. Total energy always increases
D. Energy can be created but not destroyed

Correct Answer: Option B


Explanation:
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This question belongs to: Science Physics
Question #3 Report Error
A man walking at 5 km/h reaches his office 10 minutes late. If he walks at 6 km/h, he is 5 minutes early. Distance to office is
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Correct Answer: Option A


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This question belongs to: Science Physics