Write T for true statement and F for the false one. Correct the false statement(s).

1. Convex and concave mirrors are plane reflecting surfaces.
2. The source of image in rivers is underground water.
3. Animals are called producers as they can produce their own food.
4. Solid wastes that settle at the bottom in the primary treatment of wastewater are called scum.
5. The atomic clock is the most accurate clock.

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Solution

1. F. Convex and concave are curved reflecting surfaces.

2. T. The source of water in rivers is underground water and rainfall.

3.F. Animals are called consumers as they cannot produce their own food.

4.F. Solid wastes that settle at the bottom in the primary treatment of wastewater is called sludge.

5. T. The atomic clock is the most accurate clock.

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