Communication

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A unit is used to measure the loudness of sounds is ______. 

1. centimeter (cm)
2. decibel (dB)
3. decimeter (dm)
4. ohm (Ω)

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Noise pollution happens when a sound’s loudness is _______.

1. more than 30 dBs 
2. more than 50 dBs
3. more than 70 dBs

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Noise is _______.

1. any sound that makes you relaxed and peaceful 
2. any sound that is loud, constant and makes us uncomfortable 
3. any sound that you hear in the street

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Which of the following noises can cause permanent hearing loss after eight hours?

1. motorcycle 
2. ocean wave 
3. whistling 

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Which of the following noises can cause immediate and permanent hearing loss?

1. Motorcycle
2. Concert 
3. Vacuum cleaner

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If you experience noise pollution for a long time, you _______ have headaches, high blood pressure and hearing loss. 

1. can
2. could
3. should
4. must

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Thousands of people were exposed _______________ radiation when the nuclear plant exploded.​

1. to
2. at
3. by
4. with

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Waste water from many factories which is dumped _____________ water bodies directly causes water pollution.

1. into
2. onto
3. at
4. by

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Land pollution is responsible for damage done _____________ natural habitat of animals.

1. by
2. to
3. at
4. with

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1. Natural
2. Nationality
3. Endangered
4. Dangerous