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. The input resistance of a silicon transistor is 100 W. Base current is changed
2. In Young’s double slit experiment, a third slit is made in between the double slits.
3. The equations of motion of a projectile are given by x=36 t metre and 2y=96t-9.8t²
4. A parallel beam of fast moving electrons is incident normally on a narrow slit.
5. A proton and helium nucleus are shot into a magnetic field at right angles to the field

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