9. Which does not belong to the group?
A tum on appliances even not using
B close door when using noisy machine
C use earplugs
D.unplugged electrical appliance when not being used
10. 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
11.Our ears need more than
rest to make up for two hours of exposure to 100dB
A 15 hours
B. 8 hours
C.20 hours
D.16 hours
12.The higher decibels, the
a sound is.
A louder
B. softer
C.harder
Dhigher​