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Rotational Mechanics
JEE Physics • 10 questions • Free on ExamBattle
Practice Questions
Q1
The moment of inertia of a thin ring of mass M and radius R about an axis passing through its diameter is:
- A. MR²
- B. MR²/2
- C. 2MR²
- D. MR²/4
Q2
A disc rolls without slipping. The ratio of translational KE to rotational KE is:
- A. 1:1
- B. 2:1
- C. 1:2
- D. 3:1
Q3
Angular momentum is conserved when the net external _____ is zero:
- A. Force
- B. Torque
- C. Impulse
- D. Work
Q4
The radius of gyration of a solid cylinder of radius R about its axis is:
- A. R
- B. R/√2
- C. R/2
- D. √(2/3)R
Q5
A solid sphere and a hollow sphere of same mass and radius roll down an incline. Which reaches the bottom first?
- A. Hollow sphere
- B. Solid sphere
- C. Both reach together
- D. Depends on angle
Q6
The torque of a force F = 3î + 4ĵ N acting at point r = 2î + 3ĵ m about origin is:
- A. 17k̂ N·m
- B. k̂ N·m
- C. -k̂ N·m
- D. 7k̂ N·m
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