Published by:
CGP EDU Academic Team
Published on: August 11, 2026
PART I: PHYSICS
SECTION 1 (Maximum Marks: 21)
• This section contains SEVEN questions.
• Each question has FOUR options
A
, R
B
, R 3
C
and 1
D
. ONLY ONE of these four options is correct. • For each question, marks will be awarded in one of the following categories: Full Marks + 3 If only the bubble(s) corresponding to the correct option is darkened. Zero Marks 0 If none of the bubbles is darkened. Negative Marks - 1 In all other cases. Consider an expanding sphere of instantaneous radius R whose total mass remains constant. The expansion is such that the instantaneous density 
remains uniform throughout the volume. The rate of fractional change in density 
is constant. The velocity v of any point on the surface of the expanding sphere is proportional to R 2/3
remains uniform throughout the volume. The rate of fractional change in density is constant. The velocity v of any point on the surface of the expanding sphere is proportional to R 2/3
Text Solution
Verified by ExpertsThe correct answer is:
A
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