Question

Mohan has three identical balloons X, Y and Z. Balloons X, Y and Z are filled with chilled air, air at room temperature and hot air respectively. Initially, the size of all the balloons were the same. What will be the correct order of size of balloons if they are kept for a long time at room temperature?

• A. Y > Z > X
• B. Z > X > Y
• C. X > Y > Z
• D. X = Y = Z

Answer 1

The correct option is C X > Y > Z

Initially, the size of all the balloons were the same. We know that when air is heated, it expands and when it is colled, it contracts.
When all the balloons are kept for a long time at room temperature, the air inside the balloons will be at room temperature.
The size of balloon Y will remain the same because its initial and final temperature remain the same.
Balloon X will expand, as the air inside it will be heated up to room temperature.
Similarly, balloon Z will contract, as the air inside it will cool down to room temperature.
Hence, the correct order of the size of balloons will be X>Y>Z.