The moment of inertia of a thin rod of mass M and length L about an axis through its centre and perpendicular to length is MCQ with Answer and Explanation

The moment of inertia of a thin rod of mass M and length L about an axis through its centre and perpendicular to length is

A. ML²/2

B. ML²/12

C. ML²

D. ML²/3

Answer: Option B

I_center = ML²/12. About end = ML²/3.

This question belongs to: Science Physics

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Question #1 Report Error

Three resistors 2 Ω, 3 Ω, 6 Ω are connected in parallel. Equivalent resistance is

A. 1 Ω

B. 0.5 Ω

C. 11 Ω

D. 1.5 Ω

Correct Answer: Option A

Explanation:
1/R = 1/2+1/3+1/6 = 3/6+2/6+1/6 = 6/6=1 => R=1 Ω.

This question belongs to: Science Physics

Question #2 Report Error

The direction of force on a current-carrying conductor in a magnetic field is given by

A. Right hand thumb rule

B. Fleming's left hand rule

C. Fleming's right hand rule

D. Ampere's swimming rule

Correct Answer: Option B

Explanation:
Left hand rule for motor effect. Right hand rule for generator (induced current).

This question belongs to: Science Physics

Question #3 Report Error

The rate of change of momentum is equal to

A. Work

B. Force

C. Power

D. Impulse

Correct Answer: Option B

Explanation:
F = dp/dt (Newton's second law original form). Impulse is Δp. Work F·s. Power dW/dt.

This question belongs to: Science Physics