Physics Question Paper

Thermal Physics
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5054/11/M/J/12

The answer is B because
As the air is removed from the jar, less number of gas atoms collide with the balloon and the walls of the container. Hence the pressure outside the balloon decreases. Now, there is less pressure on the outside of the balloon than the inside and this pressure difference causes the balloon to expand until the pressure inside and outside the balloon is the same.
As the balloon has expanded,  the same number of gas molecules now exert pressure on a larger area, so there are less number of gas molecules colliding per unit area so the pressure inside the balloon decreases.
Volume inside the balloon increases as it has expanded.