Physics Practice: Sound (Mock Test 3 - Advanced)
1. Advanced Logic: Why is the sound of an echo usually fainter than the original sound?
2. Resonance is observed in air columns. If the first resonance length is $L_1$, the second resonance length $L_2$ for the same frequency is approximately:
3. When a string is plucked at one-fourth of its length, the frequency of vibration produced compared to the fundamental frequency ($f$) is:
4. Which of the following conditions is mandatory for Resonance to occur between two tuning forks?
5. The loudness of sound heard at a point is doubled if the ________ of the vibrating body is doubled.
6. A ship on the surface of water sends a signal and receives an echo from the seabed after $4 \text{ s}$. If speed of sound in water is $1500 \text{ m/s}$, the depth of the sea is:
7. The quality of a musical sound depends on the ________ present in it.
8. In a damped vibration, the energy of the vibrating body is converted into ________.
9. Soldiers are asked to break steps while crossing a bridge to avoid:
10. Two strings A and B are made of the same material. String A is twice as long and has twice the diameter of B. If tension is the same, the ratio of their frequencies $f_A : f_B$ is:
11. A piano note and a flute note of same pitch and loudness sound different because of:
12. The loudness of a sound is $10 \text{ dB}$. If the intensity is increased 10 times, the new loudness is:
13. Infrasonic waves can be heard by ________.
14. The fundamental frequency of a vibrating string is $n$. If its length and tension are both doubled, the new frequency is:
15. Why does the sound of a tuning fork become louder when its stem is pressed against a table top?
16. The wavelength of a sound wave of frequency $500 \text{ Hz}$ in air (speed $= 340 \text{ m/s}$) is:
17. Which of the following characteristics does NOT change when a sound wave travels from air to water?
18. A "note" produced by a musical instrument is generally:
19. If the loudness of sound is increased by $20 \text{ dB}$, the intensity increases by a factor of:
20. Echo method is used by fishermen to locate shoals of fish. This technique is specifically called: