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2. According to studies, trees can reduce noise by _______ decibles DB around them

A.1 to 5
B.5 to 8
C.5 to 10
D.10 to 20

3. Turning off appliances when not in use can also save ________

A. Life
B. Noise
C. Pollution
D. Electricity

4. Which of the following is an example of appliances?

A. Computer,television,game system,wasing machine
B. pencil,papers,ball pen,bags
C.Sala set,refrigerators,cabinet,bookshelves
D.electric chair,tables,beds,char


5. These are small insert that fit into our ear canal.

A. Earplugs
B. Earmuffs
C. Absorbents
D. Cotton buds​