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Sugar, wood and paper turned black when burned. What substance do they have in common? *
1 point
A. oxygen
B. carbon
C. nitrogen
D. moisture
2. Why is the presence of Chlorofluorocarbons (CFCs) in the air is harmful? *
1 point
A. It darkens the cloud.
B. It makes the ozone layer thin.
C. It makes the ozone layer thick.
D. It prevents the ultra violet rays coming from the sun.
3. The government encourages motorist to use unleaded fuel. Why? *
1 point
A. It is less harmful to people and environment.
B. It is cheaper.
C. It is safer to use.
D. A and C is correct.
4. Materials that can allow electric current to pass through are considered as_______. *
1 point
A. conductors
B. Insulators
C. circuit
D. electromagnet
5. It is a device which open and closes a circuit. *
1 point
A. switch
B. fuse
C. dry cell
D. metal
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