Home PYQs UPPSC UPPSC MCQs Prelims 1994 (GS Paper I)

Question

When a glass rod is placed in steam, its length increases but its width:

  1. remains unchanged
  2. decreases
  3. increases
  4. becomes irregular

Answer:

Option D: becomes irregular

Detailed Solution:

The correct answer is “becomes irregular”.

This heat energy causes the glass rod to expand in length due to thermal expansion. However, the expansion in width is not uniform because the glass rod is not a perfect conductor of heat.