Page 75 - ScienceStd4

Note: Your safety is a priority. Seek medical help if severe burns
or injuries have occurred.

Activity 2
FOR ONLINE READING ONLY

Visit the kitchen in your home place or school and observe
how the cook protects from burning when handling hot
substances.

Revision exercise

Section A: Choose the most correct answer

1. What does combustion mean?

(a) The process of solidifying substances

(b) The process of deteriorating substances

(c) The process of changing substances into a liquid state

(d) The process of combining fuel with oxygen to produce
heat and light

2. What is needed for combustion to take place?

(a) Air, water and light

(b) Fuel, water and oxygen

(c) Fuel, heat and oxygen

(d) Water, heat and oxygen

3. What is the role of oxygen in the combustion process?

(a) To provide heat

(b) To prevent the fire

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