Question

4. The amount of heat required to increases the temperature of 20 g water by 1⁰C is ___________ .

• A. 10 Cal
• B. 20 Cal
• C. 15 Cal
• D. 2 Cal

Answer 1

The correct option is B

20 Cal

Explanation for correct option:

Specific heat is the heat required to raise the temperature of unit mass by 1⁰C.

Specific heat of pure water is 1 Cal/g/⁰C.

Hence, 1 g of water has a specific heat capacity = 1 Cal/g/⁰C.

Therefore, 20 g water has specific heat capacity = (20 $\times$1) Cal/g/⁰C = 20 Cal/g/⁰C.

Hence, Option B is correct.