Physics Practice: Sound (Mock Test 3 - Advanced)
1. Why do we hear the sound of an approaching plane before we can see it clearly, but we see lightning before we hear thunder?
2. If a vibrating tuning fork is placed on a table, the table starts vibrating with a much larger surface area. This is an example of:
3. A person fires a gun and hears an echo from a cliff after $2 \text{ seconds}$. If the speed of sound is $340 \text{ m/s}$, the distance of the cliff is:
4. Why are the walls of concert halls and cinema theaters covered with porous materials like glass wool or thermocol?
5. "Resonance" occurs when the frequency of the external periodic force is ________ the natural frequency of the body.
6. Which anatomical part of the human ear vibrates first when sound waves strike it?
7. Two musical notes have the same pitch and loudness but sound different because they have different ________.
8. The sound produced by a Jal-Tarang depends on the ________ of the air column in the cups.
9. Why can we hear an echo in a large empty hall but not in a small room?
10. Ultrasonic waves are used in bats for "Echolocation" to detect obstacles because they have ________.
11. A wire under tension $T$ and length $l$ vibrates with frequency $f$. If tension is increased, the frequency will:
12. The loudness of sound is measured in Decibels. A sound above ________ is considered noise pollution.
13. In stringed instruments, the hollow box (soundbox) is provided to ________.
14. When sound travels from air to a solid medium, which property remains unchanged?
15. The phenomenon of "Beats" is used by musicians to ________.
16. The subjective sensation of pitch is related to the physical quantity ________.
17. A sound wave of frequency $500 \text{ Hz}$ and wavelength $0.7 \text{ m}$ is traveling in air. Its speed is:
18. We can distinguish between the sound of a piano and a flute even if they play the same note due to:
19. If a body vibrates with its own natural frequency without any external force, the vibrations are:
20. The part of the human ear that converts mechanical vibrations into electrical signals is the ________.