Question

When a copper solid sphere is heated, its
(a) moment of inertia increases
(b) Elasticity decreases
(c) density decreases
(d) mass increases

• A. only (b) is true
• B. (a) & (b) are true
• C. (a),(b) & (c) are true
• D. all are true

Answer 1

Answer: (C)

(a),(b) & (c) are true

(a) as radius increases therefore Moment of Inertia increases

(b) Elasticity decreases with rise in temperature

(c) Since volume increases but mass remains same therefore, density which is mass/volume decreases.

(d) Law of conservation of mass mass does not changes therefore this is false.

Hence option(C) is correct