8. Which does not belong to the group?
a. turn on appliances even not using
b. use earplugs
c. unplugged electrical appliance when not being used
d. close door when using noisy machine
9. All of the statement are correct, EXCEPT
a. annoying sound caused by vibration that strikes on the nose line
b. noise pollution affects both health and behavior
C. noise is unwanted sound.
d. noise pollution is associated with several health conditioning.
10. What is the importance of keeping a clean environment?
a. It improves a healthy environment.
b. It keeps the environment free from any noise, water, and air pollutions.
c. It helps reduces health problems and diseases.
d. All of the above​