Question

The pressure and volume of a given mass of gas at a given temperature are P and V respectively. Keeping temperature constant, the pressure is increased by 10% and then decreased by 10%. The volume how will be –

• A. Less than V
• B. More than V
• C. Equal to V
• D. Less than V for diatomic and more than V for monoatomic

Answer 1

Answer: (B)

More than V

Answer 2

When the pressure is first increased by 10% it becomes (110/100) P. when it is decreased by 10% from there, the pressure becomes

$\frac{110 \times 90}{100 \times 100}$ P = $\frac{99}{100}$ P

Thus the pressure decreases by 1% volume is increased by nearly 1%