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Subjects
Science State Board
Class 8
Sound
Textbook questions

3. Choose the correct answer III

Exercise condition:

3 m.

1. The range of audible frequency for the human ear is

2 Hz to 2000 Hz
20 Hz to 2000 Hz
20 Hz to 20000 Hz
200 Hz to 20000 Hz

2. If the amplitude and frequency of a sound wave are increased, which of the following is true?

Loudness increases and pitch is lower.
Loudness decreases and pitch is lower.
Loudness increases and pitch is unchanged.
Loudness increases and pitch is higher.

3. Which of the following may be caused by noise?

Nervousness
Stress
All the above
Irritation

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