Question

Four identical conical flasks A, B, C & D each are filled with 500 ml of water. The flasks A, B, C & D are heated till the water attain temperatures of $45{}^{\circ }C,55{}^{\circ }C,65{}^{\circ }C$ and $85{}^{\circ }C$ respectively. Which of the following flasks, contain the highest water level?

• A. Flask A
• B. Flask B
• C. Flask C
• D. Flask D

Answer 1

The correct option is D Flask D

Liquids tend to expand when their temperature increases, this expansion of a liquid on being heated is called thermal expansion of the liquid. For example, the same mass of boiling water occupies more volume at $100{}^{\circ }C$ than at $20{}^{\circ }C$.

Since, Flask D attains the highest temperature of $85{}^{\circ }C$ so it will contain the highest water level.