In an experiment to demonstrate a property of light, three cardboards, A, B, and C with holes in their centres are arranged in a straight line between a lighted bulb and an observer as shown in the illustration below.

Study the illustration carefully and use it to answer the question that follow:

1. What would the observer see from the position shown?

2. What would the observer see when cardboard B is slightly displaced from the line?

3. Explain the observation made in (a) (ii) above.

4. What would be observed when the cardboard B is brought back to its original position?

5. What property of light is being demonstrated in this experiment?

6. Mention

   1. two natural occurrences that could be explained by the property of light demonstrated.

   2. one device that works on the property of light demonstrated.

The diagrams below are illustrations of hazards symbols found in everyday life.

Study them carefully and use them to answer the questions that follow:

1. What does each symbol A, B, C and D represent?

2. Name one substance each that is associated with each of the symbols A, B and C.

3. Name one place where the symbols D can be found.

4. State two advantages of hazard symbols.

The diagrams below are illustrations of the different types of teeth in humans.

Study the diagram carefully and answer the questions that follow.

1. Identify each type of teeth labelled A, B and C.

2. Describe the shape of each of the teeth labeled A, B and C.

3. State one function of each of the teeth labeled A, B and C.

4. Name the parts of the teeth labeled I and II.

The diagrams below are illustrations of some farm tools.

Study them carefully and use them to answer the questions that follow:

1. Identify each of the following labeled A, B, C, D and E.

2. Mention one use of each of the tools labeled A, B, C, D and E.