Two discs of same material and thickness have radii 0.2 m and 0.6 m.

⇦

⇨

Two discs of same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio

Options

(a) 1 : 81
(b) 1 : 27
(c) 1 : 9
(d) 1 : 3

Correct Answer:

1 : 81

Explanation:

I = (1/2) MR² = (1/2) (πR²t ρ) R² = πtρR⁴ / 2
t and p are same
I₁/I₂ = [R₁/R₂]⁴ = [0.2 / 0.6]⁴ = 1 / 81.

Related Questions:

1. 34 gram of water at 30⁰C is poured into a calorimeter at 15⁰C.
2. Two resistors of resistances 2Ω and 6Ω are connected in parallel.
3. A nucleus disintegrates into two nuclear parts which have their velocities in the ratio
4. The identical loops of copper and aluminium are moving with the same speed
5. A calorimeter contains 0.2 kg of water at 30° C. 0.1kg of water at

Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends