A ball is dropped from a height of 5 m on a floor and rebounds to 1.25 m. Coefficient of restitution is MCQ with Answer and Explanation

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A ball is dropped from a height of 5 m on a floor and rebounds to 1.25 m. Coefficient of restitution is

A. 0.5

B. 0.25

C. 1

D. 0.8

Answer: Option A

Solution (By JKExamLibrary)

e = √(h₂/h₁) = √(1.25/5) = √0.25 = 0.5.

This question belongs to: Science Physics

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Question #1 Report Error

A ray of light travels from glass (μ=1.5) to air. Critical angle is

A. sin⁻¹(1/3)

B. sin⁻¹(2/3)

C. sin⁻¹(1/1.5)

D. sin⁻¹(1.5)

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Correct Answer: Option C

Explanation:
sin C = 1/μ = 2/3 ≈ 0.6667, C = sin⁻¹(2/3). So option A: sin⁻¹(2/3). Wait sin C = n2/n1 = 1/1.5 = 2/3. So C = sin⁻¹(2/3). Option A is sin⁻¹(2/3). I'll correct to A.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following is the correct sequence of increasing wavelength?

A. Infrared < Radio < X-rays < Gamma

B. X-rays < Gamma < Radio < Infrared

C. Radio < Infrared < X-rays < Gamma

D. Gamma rays < X-rays < Infrared < Radio

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Correct Answer: Option D

Explanation:
EM spectrum: Gamma (0.1 m). Increasing wavelength: Gamma, X-ray, IR, Radio.

This question belongs to: Science Physics

Question #3 Report Error

Assertion (A): The coefficient of kinetic friction is always strictly less than the coefficient of limiting static friction. Reason (R): Once motion starts, the inertia of rest is broken and interlocking of surface irregularities is less effective.

A. Both A and R are true but R is NOT the correct explanation of A.

B. Both A and R are true and R is the correct explanation of A.

C. A is false but R is true.

D. A is true but R is false.

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Correct Answer: Option B

Explanation:
Static friction opposes impending motion, reaching a maximum called limiting friction. Once the object moves, it doesn't have enough time for the microscopic irregularities (asperities) of the two surfaces to interlock strongly. Thus, the force required to keep it moving (kinetic friction) is slightly less than the force required to start the motion.

This question belongs to: Science Physics

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