Physics Practice: Sound (Mock Test 5 - Ultimate Comprehensive)
1. The sound produced by a vibrating body travels through air in the form of:
2. To increase the loudness of a sound by 4 times, the amplitude of vibration must be increased by:
3. A tuning fork of frequency $n$ is sounded together with another of frequency $n+5$. The number of beats heard per second is:
4. Which of the following does NOT affect the speed of sound in a gas?
5. For an echo to be distinguished from the original sound, the time interval must be at least:
6. Resonance occurs when the frequency of the periodic external force is ________ the natural frequency of the body.
7. A sonic boom is heard when an object travels at a speed:
8. The pitch of a woman's voice is generally ________ than that of a man.
9. Which of the following uses the principle of multiple reflections of sound?
10. Two strings of same length and material are under tensions in ratio $1:9$. Their fundamental frequencies are in ratio:
11. A musical scale consists of notes of ________ frequencies.
12. The amplitude of a resonant vibration is very large because of the absence of:
13. The speed of sound is maximum in ________.
14. When the frequency of sound increases, its wavelength ________ in the same medium.
15. An ultrasonic sound has frequency $100 \text{ kHz}$. Its wavelength in air ($v = 340 \text{ m/s}$) is:
16. We can distinguish between the sound of a Sitar and a Violin even if they produce notes of same pitch and loudness because of:
17. In a stretched string, if the mass per unit length is increased 4 times, the fundamental frequency becomes:
18. Human ear is most sensitive to frequencies around:
19. If a sound wave reflects from a denser medium, there is a phase change of:
20. The loudness level of "Normal Conversation" is approximately: