Q. The reading of spring balance when a block is suspended from it in air is 60N. This reading is changed to 40N when the block is submerged in water. The specific gravity of the block must therefore
A) 3/2
B) 6
C) 2
D) 3
Explanation
(d) $Specific\ gravity = \frac{weight\ of\ block\ in\ air}{loss\ in\ weight\ of\ block\ in\ liquid}$
$= \frac{60}{60 - 40} = \frac{60}{20} = 3$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.