A flywheel rotates at 120 rpm. Angular velocity in rad/s is MCQ with Answer and Explanation

Question Report Error

A flywheel rotates at 120 rpm. Angular velocity in rad/s is

A. π

B. 4π

C. 2π

D. 6π

Answer: Option B

Solution (By JKExamLibrary)

ω = 2π × (rpm/60) = 2π × 120/60 = 4π rad/s.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

TIR condition: light travels from:

A. Denser to rarer with i > θ_c

B. Rarer to denser

C. Vacuum to medium

D. Any media at any angle

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Correct Answer: Option A

Explanation:
Total internal reflection requires: (1) denser→rarer medium, (2) incidence angle > critical angle. Memory aid: 'TIR: n₁>n₂ AND i>θ_c'. Optics condition frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2 Report Error

A piece of ice is floating in a glass beaker containing water. When all the ice melts, the level of water in the beaker will:

A. Remain the same

B. Fall

C. First rise, then fall

D. Rise

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Correct Answer: Option A

Explanation:
According to Archimedes' principle, the floating ice displaces a volume of water equal to its own weight. When the ice melts, it transforms into a volume of water that is exactly equal to the volume of water it displaced while floating. Therefore, the water level remains unchanged.

This question belongs to: Science Physics

Question #3 Report Error

A pendulum has time period 2 s. If its length is increased by 4 times, new period is

A. 8 s

B. 4 s

C. 2 s

D. 1 s

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Correct Answer: Option B

Explanation:
T ∝ √L, L'=4L => T' = √4 T = 2×2 = 4 s.

This question belongs to: Science Physics

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