Class 9th Science Chapter – 11 Sound
| Textbook | NCERT |
| Class | 9th |
| Subject | Science |
| Chapter | 11th |
| Chapter Name | Sound |
| Category | Class 9th Science |
| Medium | English |
| Source | Last Doubt |
| Class 9th Science Chapter – 11 Sound MCQ with answer What is called sound? Why is sound a wave? What is sound simply? What is a sound answer? What is called sound answer? Why is sound physics? What is sound in physics?What are three types of sound? What type of wave is sound? What creates sound? What are properties of sound? What is the theory of sound? What is sound and its types?What is the role of sound? How does sound travel? What are the three functions of sound? What are the 7 functions of sound? |
Class 9th Science Chapter – 11 Sound
Chapter – 11
Sound
MCQ
| (1) The SI unit of frequency is _____? A. S-1 B. Hertz C. M-1 D. Both (A) and (B) Answer – (D) Both (A) and (B) |
| (2) A mechanical wave can propagate? A. Through a gas B. without a material medium C. through a liquid. D. Both (A) and (C) Answer – (D) Both (A) and (C) |
| (3) Amplitude of a sound wave indicates? A. The distance travelled by the wave in one second. B. The distance between two vibrating particles which are in phase. C. The distance between a compression and an adjacent rarefaction. D. The maximum displacement of a particle in either side of its mean position. Answer – (D) The maximum displacement of a particle in either side of its mean position. |
| (4) Identify the correct representation of the audible range for human beings? A. 2 kHz – 20 kHz B. 0.02 kHz – 20 kHz C. 0.2 kHz – 20 kHz D. 0.02 kHz – 2 kHz Answer – (B) 0.02 kHz – 20 kHz |
| (5) The minimum distance in which a sound wave repeats itself is called _____? A. Frequency B. Amplitude C. Wavelength D. Time period Answer – (C) Wavelength |
| (6) A mechanical wave can travel? A. In a material medium but not in vacuum B. In vacuum but not in a material medium, C. Both in vacuum and a material medium. D. Neither in a material medium nor in vacuum. Answer – (A) In a material medium but not in vacuum |
| (7) Which of the following is a mechanical wave? A. Radiowave B. A sound wave travelling in air C. A light wave travelling in air D. Microwave Answer – (B) A sound wave travelling in air |
| (8) The frequency of a sound wave? A. Is a characteristic of the source of sound. B. Decreases if the amplitude of the wave increases. C. Increases if the amplitude of the wave increases. D. Depends on the nature of the medium in which the wave propagates. Answer – (A) Is a characteristic of the source of sound. |
| (9) The SI unit of wavelength is _________? A. M-1 B. M-2 C. CM-1 D. M Answer – (D) M |
| (10) What is the full form of SONAR? A. Sound Navigation and Ranging B. Sound Noise and Ranging C. Sound Navigation and Ringing D. None of these Answer – (A) Sound Navigation and Ranging |
| (11) The loudness of a sound is? A. Directly proportional to amplitude of vibration. B. Inversely proportional to amplitude of vibrations. C. Directly proportional to square of the amplitude of vibration. D. Inversely proportional to square of the amplitude of vibration. Answer – (C) Directly proportional to square of the amplitude of vibration. |
| (12) Identify the one that represents an ultrasonic frequency from the following? A. 5 kHz B. 12 kHz C. 18 kHz D. 24 kHz Answer – (D) 24 kHz |
| (13) In a mechanical wave? A. A disturbance propagates through a medium. B. Medium particles carry energy from one place to another place. C. Medium particles vibrate in random directions. D. Medium particles do not move from their mean positions. Answer – (A) A disturbance propagates through a medium. |
| (14) The part of the human ear that vibrates when sound from an external source incident on it is called? A. Tympanic membrane B. Pinna C. Cochlea D. Anvil Answer – (A) Tympanic membrane |
| (15) Identify the quantities which determine the pitch of a sound? A. Velocity B. Wavelength C. Time period D. Frequency Answer – (D) Frequency |
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