Physics Practice: Sound (Mock Test 4 - Expert)
1. In an expert acoustic study, the speed of sound in a gas is $V$. If the absolute temperature of the gas is quadrupled, the new speed of sound will be:
2. A sound wave travels from air into water. Which of the following properties remains strictly unchanged?
3. The intensity of sound at a point is ________ proportional to the square of the distance from the source.
4. "Subjective" nature of sound is associated with ________, whereas "Objective" nature is associated with ________.
5. A person claps near a cliff and hears the echo after $1.5 \text{ s}$. If he moves $34 \text{ m}$ away from the cliff, the new echo will be heard after: (Speed = $340 \text{ m/s}$)
6. The minimum time interval required by the human ear to distinguish two sounds is:
7. Ultrasonic waves are used in echocardiography to image the ________.
8. The pitch of a wind instrument (like a flute) is increased by ________ the length of the vibrating air column.
9. Which property of sound is used to detect cracks or flaws in metal blocks?
10. The speed of sound in air at $0^\circ C$ is $332 \text{ m/s}$. At $20^\circ C$, it will be approximately ________.
11. A sound source of $500 \text{ Hz}$ emits waves of wavelength $0.7 \text{ m}$. The speed of sound is:
12. The "Threshold of Hearing" for a normal human ear is ________ $dB$.
13. In a longitudinal wave, the distance between a compression and the next adjacent rarefaction is:
14. When sound reflects from a distant object, the total distance traveled by the sound to hear an echo is:
15. SONAR stands for Sound ________ and Ranging.
16. The amplitude of a sound wave is doubled. The loudness will increase by ________ times.
17. Which of the following is NOT a characteristic of a musical sound?
18. The pitch of a drum is lower than a whistle because the drum has a ________ frequency.
19. If a tuning fork is loaded with a little wax, its frequency ________.
20. The speed of sound in vacuum is: