Question

A balloon filled with hydrogen has a volume of 1 $m^3$ and its mass is 1 kg.The volume of the block of a very light material which it can just lift is

[Density of material of block is 91.3 kg/$m^3$ and that of air is 1.3 kg/$m^3$]

• A. $\frac{1}{200}$ $m^3$
• B. $\frac{1}{400}$ $m^3$
• C. $\frac{1}{300}$ $m^3$
• D. $\frac{1}{100}$ $m^3$

Answer 1

The correct option is C

$\frac{1}{300}$ $m^3$

$V=\frac{V_1{d}_1-M}{(d_2-d_1)}=\frac{1\times 1.3-1}{91.3-1.3}=\frac{1}{300}$