Test Index

WAEC Physics 2016 Paper

Question : 6

Total: 47

Solution:

Concept:

An object suspended in a liquid appears lighter because of the upthrust, equal to the weight of the displaced liquid.

Explanation:

Mass of object

= \text{density} \times \text{volume} = 2.5 \times 400 = 1000\text{ g}

Volume of water displaced

= \frac{400}{2} = 200\text{ cm}^3

Loss in mass

= \text{volume displaced} \times \text{density of water} = 200 \times 1 = 200\text{ g}

Reading on spring balance

= \text{actual mass} - \text{loss in mass} = 1000 - 200 = 800\text{ g}

Answer:

The reading on the spring balance is

800\text{ g}

Correct option: C. 800g

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