Understanding Noise Pollution Sources

What phenomenon is described when loud noises cause discomfort or pain?

• Air pollution

• Noise pollution

• Water pollution

• Land pollution

How does noise pollution differ from other types of pollution like water, land, or air pollution?

• It is always visible.

• It is invisible.

• It is only visible at night.

• It can be seen with special equipment.

Which of the following is NOT mentioned as a common sound in daily life that can become noise pollution?

• Alarm clock

• School bus

• School bell

• Bird chirping

When do necessary sounds become noise pollution?

• When they are too soft.

• When they are too loud or last too long.

• When they are heard indoors.

• When they are heard outdoors.

What are the two main types of noise pollution?

• Audible and inaudible

• Harmful and harmless

• Natural and man-made

• Constant and intermittent

Which of these is an example of a natural source of noise pollution?

• Loudspeakers

• Traffic

• Animals

• Construction sites

What is identified as the major factor responsible for causing noise pollution?

• Natural calamities

• Man-made machines

• Birds

• Animals

Which of the following is a source of man-made noise pollution?

• Volcanic eruptions

• Dogs barking

• Loudspeakers

• Bird calls

Up to what decibel level are human ears designed to hear sound without damage?

• 1 dB

• 85 dB

• 100 dB

• 50 dB

At what decibel level or above can sounds cause permanent damage to human ears?

• 1 dB

• 50 dB

• 70 dB

• 85 dB