16 Questions
When a key of a mechanical piano is struck gently and then struck again but much harder, what happens to the sound produced?
The sound becomes louder and the pitch increases
What is a note in terms of sound?
A mixture of several frequencies
What is the main focus of NCERT Exemplar Solutions for Class 9 Science Chapter 12 - Sound?
The application of ultrasound
What is the range of hearing?
20-20,000 Hz
What types of questions are included in the NCERT Exemplar Solutions for Class 9 Science Chapter 12 - Sound?
MCQs, short answer questions, and long answer questions
How are ultrasound waves applied in NCERT Exemplar Solutions for Class 9 Science Chapter 12 - Sound?
For medical imaging
What type of waves are used in SONAR?
Ultrasonic waves
What happens to the sound in the second case?
The sound will be louder, but the pitch will not be different
In which medium does sound travel?
Disturbance moves
How do we change feeble sound to loud sound?
Amplitude
In the given curve, where is half the wavelength?
BD
What kind of sound does an earthquake produce before the main shock wave begins?
Infrasound
Who can hear infrasound?
Rhinoceroses
What does a sitarist adjust before playing in a musical concert?
Frequency of the sitar string with the frequency of other musical instruments
What is the effect of adjusting tension and plucking the string suitably by a sitarist before playing in a concert?
Change in frequency of the sitar string with other musical instruments
What factor does loudness depend on?
Force by which a key is pressed
Access free PDF download of NCERT Exemplar solutions for Class 9 Science Chapter 12 - Sound. These solutions cover important concepts related to sound propagation, production, range of hearing, and ultrasound applications, enabling students to tackle various types of exam questions with ease.
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