Chapter 10: Sound Waves: Characteristics and Applications — Online MCQ Test
SCIENCE · Grade 9 · CBSE(NCERT)
Practice Chapter 10: Sound Waves: Characteristics and Applications with a free chapter-wise online MCQ test.
This chapter covers: Sound Wave Longitudinal Wave Frequency Wavelength Amplitude Echo SONAR Pitch Loudness Vibration Propagation Understanding sound production wave properties transmission echoes and p....
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Chapter 10: Sound Waves: Characteristics and Applications — Important Questions & Answers
Which of the following is the correct definition of sound?
- A. A form of energy produced by vibrating bodies
- B. A form of light produced by hot objects
- C. A magnetic force acting between objects
- D. A chemical reaction in air
Answer: A. A form of energy produced by vibrating bodies
Sound is produced when an object vibrates and the energy is transferred through a medium. It is not related to light, magnetism, or chemical reactions.
Sound is produced when an object vibrates and the energy is transferred through a medium. It is not related to light, magnetism, or chemical reactions.
Sound waves in air are which type of waves?
- A. Transverse waves
- B. Longitudinal waves
- C. Electromagnetic waves
- D. Surface waves
Answer: B. Longitudinal waves
In air, sound travels as longitudinal waves because the particles vibrate parallel to the direction of propagation.
In air, sound travels as longitudinal waves because the particles vibrate parallel to the direction of propagation.
Why can sound not travel in vacuum?
- A. Because sound needs a medium for propagation
- B. Because vacuum blocks vibrations completely
- C. Because sound is made of light rays
- D. Because air is the only medium for sound
Answer: A. Because sound needs a medium for propagation
Sound requires a material medium such as air, water, or solids to travel. It cannot propagate in vacuum.
Sound requires a material medium such as air, water, or solids to travel. It cannot propagate in vacuum.
Two sound waves travel in the same medium. Wave A has larger amplitude than Wave B, but both have the same frequency. Which statement is correct?
- A. Wave A has higher pitch and lower loudness
- B. Wave A has higher loudness and same pitch
- C. Wave A has lower loudness and higher pitch
- D. Wave A has different speed and different wavelength necessarily
Answer: B. Wave A has higher loudness and same pitch
Amplitude determines loudness, while frequency determines pitch. If frequency is the same, the pitch remains the same.
Amplitude determines loudness, while frequency determines pitch. If frequency is the same, the pitch remains the same.
A person hears a sound of 25 Hz. Which statement is most appropriate according to CBSE NCERT?
- A. It is an infrasonic sound, below the audible range of humans
- B. It is ultrasonic and heard clearly by humans
- C. It is a very loud sound
- D. It is an echo
Answer: A. It is an infrasonic sound, below the audible range of humans
Human beings can generally hear sounds from about 20 Hz to 20,000 Hz. A 25 Hz sound lies below the lower limit and is infrasonic.
Human beings can generally hear sounds from about 20 Hz to 20,000 Hz. A 25 Hz sound lies below the lower limit and is infrasonic.