A) heated above \[4{}^\circ C\]
B) cooled below \[4{}^\circ C\]
C) both heated and cooled above and below \[4{}^\circ C\] respectively
D) None of the above
Correct Answer: C
Solution :
Key Idea: Density of water is maximum at \[4{{\,}^{o}}C.\] Certain substances do not expand but contract when heated within a certain range of temperature, water is such a substance. Density of water is maximum at\[4{{\,}^{o}}C.\], so its volume is minimum at this temperature initially at a temperature. If water is heated above \[4{{\,}^{o}}C,\] its volume increases. Now on cooling when above \[4{{\,}^{o}}C\]it contracts, on cooling further below \[4{{\,}^{o}}C\]its volume increases instead of decreasing. This is known as anomalous expansion of water. Since volume increases water will over flow.
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