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WAEC Physics 2010 Paper

Question : 20

Total: 50

Solution:

Concept:

Specific heat capacity is the heat energy needed to raise the temperature of

1\ \text{kg}

of a substance by

1\ \text{K}

Explanation:

The formula is

c = \dfrac{Q}{m\Delta T}

Here,

c = 36.4\ \text{J kg}^{-1}\text{K}^{-1}

This means

Q = 36.4\ \text{J}

m = 1\ \text{kg}

, and

\Delta T = 1\ \text{K}

So, supplying

36.4\ \text{J}

of heat to a body of mass

1\ \text{kg}

raises its temperature by

1\ \text{K}

Answer:

Option C: mass

1\ \text{kg}

, the temperature rises by

1\ \text{K}

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