Physics Practice: Sound (Mock Test 1 - Basic)
1. Sound is produced by ________ bodies.
2. Sound travels fastest in ________.
3. Sound cannot travel through ________.
4. The number of vibrations per second is called ________.
5. The SI unit of frequency is ________.
6. The maximum displacement of a vibrating particle from its mean position is called its ________.
7. The loudness of sound depends on its ________.
8. The pitch of sound depends on its ________.
9. Humans can hear sounds within the frequency range of ________.
10. Sounds with frequencies above $20,000 \text{ Hz}$ are called ________.
11. Reflection of sound that is heard after a delay is called an ________.
12. To hear a distinct echo, the minimum distance from the reflecting surface should be approximately ________.
13. The characteristic of sound that allows us to distinguish between two different instruments playing the same note is ________.
14. SONAR is a technique used to measure the ________ of the sea.
15. An unpleasant, loud, and irregular sound is called ________.
16. The speed of sound in air is approximately ________.
17. Large auditoriums use ________ to absorb sound and prevent echoes.
18. The persistence of sound after the source has stopped is called ________.
19. Bats navigate and find food using ________.
20. The level of noise is measured in units called ________.