1. It refers to the process where the substance burns in the presence of oxygen.
a. Rusting
b. Combustion
C. Oxidation
2. What is the caused by
reaction of iron with oxygen
present in the air?
a. Humidity
b. Moisture
C. Rusting
3. The following are the
ways to prevent rusting, except
one.
a. Keep it clean and dry
b. Apply paint
c. Let it wet and moist.
4. What will happen if one element needed for
combustion is not present?
a. The fire will continue its flame.
b. Combustion will not occur.
c. There should be heat, fuel and oxygen
5. Which of the following shows the absence of oxygen in a material?
a. combustion
b. Lighted candle covered with glass
c. Rusting

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