1 Noise is
a) loud sound
b) constant sound
c) unwanted sound
d) sound of high frequency
2. Noise pollution is measured in
a) joule
b) Ohm
c) Decibel
d) Ampere
3. Infrasonic frequencies are
a) below 50Hz
b) above 50Hz
c) above 15000Hz
d) none of these
4. Ultrasonic
frequencies are
a) below15000Hz
b) above 1500Hz
c) above 15000Hz
d) none of these
5. Green muffler is related
to the pollution of
a) air
b) soil
c)noise
d) water
6. The most significant attribute of noise is its
a) duration
b) loudness
c) frequency
d)unpleasant nature
7. Sound limits in industrial areas is
a) 75dB
b) 40dB
c) 50dB
d) 30dB
8. Sound becomes hazardous noise pollution at level
a) above 30 dB
b) above 80 dB
c) above 100 dB
d) above 120 dB
9.Exposure of noise pollution causes
a) increased heart
beat
b) dilation of
pupil
c) constriction of
blood vessels
d) all of these
10. Permanent loss of hearing occurs at ---due to continuous noise
exposure.
a) 75dB
b) 100dB
c) 50dB
d) 80 dB
11. What is the safe noise level of city fixed by WHO?
a) 20dB
b) 90dB
c) 150dB
d) 45 dB
Answers:
1. c) unwanted
sound
2. c) Decibel
3. a) below 50Hz
4. c) above 15000Hz
5. c)noise
6. b) loudness
7. a) 75dB
8. b) above 80 dB
9. d) all of these
10. b) 100dB
11. d) 45 dB
