Question

A body of volume $100c{m}^3$ weights $1kgf$ in air. Find its relative density.

• A. $1$
• B. $10$
• C. $100$
• D. $0.1$

Answer 1

The correct option is B $10$

Volume of body $=100{cm}^3$

Actual Mass of body $=1kg=1000g$

Since the density of air is very low, the buoyant force experienced by the object in air is negligible. Therefore, the weight of the object as measured in air is equal to its actual weight.

Density of body $=\frac{Mass}{Volume}=\frac{1000}{100}=10g/{cm}^3$

Relative Density $=\frac{{Density}_{Body}}{{Density}_{Water}}=\frac{10}{1}=10$