Question

A body weights W in air and it loses its weight by 25% in water. The relative density of the body is:

• A. 4
• B. 1/4
• C. 3/4
• D. 4/3

Answer 1

Answer: (B)

1/4

Answer 2

Relative density = Specific gravity R.D

=

= $\frac { \mathrm { W } _ { \mathrm { a } } } { \mathrm { Wa } - \mathrm { W } _ { \mathrm { w } } } = \frac { \mathrm { W } _ { \mathrm { a } } } { \Delta \mathrm { W } }$ =

[since weight of the body decreases by 25 % of its original

weight W_a (weight in air)].

⇒ R.D. = 4.

Therefore (2).