Class 8 Science Sound Very Short Answer
Very Short Answer Questions.
1. Name the factor on which the loudness of the sound depends.
The loudness of the sound depends on the amplitude of the sound wave. Greater amplitude produces louder sound and smaller amplitude produces feeble sound.
- What is our audible range?
The range is typically between 20Hz and 20,000Hz.
- What is sound?
A sound is a form of energy. We hear sounds when things vibrate.
- Why is noise pollution harmful to us?
Noise pollution can create many types of health-related problems, such as lack of sleep (insomnia), hypertension, loss of hearing, anxiety, etc. Sound above 80 dB is very painful to hear.
A person who is exposed to loud sound continuously may get permanent or temporary loss of hearing (impairment of hearing).
.5. Name the sophisticated part of our ear that can be easily damaged.
The eardrum is the sophisticated part of our ear that can be easily damaged.
6. Name some sources available at home that may lead to noise pollution.
Television, mobile, mixer grinder, pressure cooker, vacuum cleaner, washing machine dryer,
7. Why should we never put a sharp, pointed or hard, thing into our ear?
We should not put anything (like pin, pencil or pen etc.) inside our ears because they
can hurt the eardrum and can make a person completely deaf.
8. Why are we not able to hear the screams of a bat?
Bat produces ultrasonic sound during screaming i.e is the frequency of a sound is more than 20,000Hz, it cannot be heard by us. The sound of these frequencies is inaudible. So we are not able to hear the screams of a bat
9. Write the full form of dB.
Decibel is the full form of dB.
10. Name the substance which vibrates in a flute to produce sound.
Flute uses air as the primary vibrating medium for the production of sound.