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. A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively
2. Amout of heat required to raise the temperature of a body through 1 K is called its
3. The electrons are emitted in the photoelectric effect from a metal surface
4. The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function
5. A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω

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