NCERT Exemplar for Class 9 Science - Sound - Free PDF Download
Free PDF download of NCERT Exemplar for Class 9 Science Chapter 12 - Sound solved by expert Science teachers on Vedantu.com as per NCERT (CBSE) Book guidelines. All Chapter 12 - Sound exercise questions with solutions to help you to revise the complete syllabus and score more marks in your examinations. EveryNCERT Solutionis provided to make the study simple and interesting on Vedantu. Subjects like Science, Maths, English will become easy to study if you have access to NCERT Solution for Class 9 Science , Maths solutions and solutions of other subjects. You can also download NCERT Solutions for Class 9 Maths to help you to revise the complete syllabus and score more marks in your examinations.
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Science NCERT Exemplar for Chapter 12 (Sound) of Class 9
Chapter 12 of Science NCERT deals with the fundamental information about sound. Various concepts are discussed in this Chapter. These concepts will help build a concrete foundation for the students that will help them in higher studies and also in qualifying competitive exams.
Key Points in Chapter 12 of Class 9 Science NCERT:
Some of the important points that are discussed in Chapter 12, that is, sound of Class 9th NCERT are:
Vibrations of different objects produce sound.
Sound travels in the form of longitudinal waves through a material medium.
While travelling, sound forms successive compressions and rarefactions in the medium.
During sound propagation, it is not the particles of the medium but the energy of the sound that travels.
Sound travel is not possible in a vacuum.
One complete oscillation refers to the change in density from maximum to minimum and back to maximum.
The period in which a wave completes one oscillation is referred to as a period and is denoted with a T.
The wavelength of sound is the distance between two consecutive compressions or rarefactions and it is denoted by lambda.
The number of oscillations completed per unit time is referred to as frequency. It is denoted with v and its value is the inverse of the period, that is, 1/T.
The speed with which sound travels in a medium depends on the nature and temperature of the medium in which it is travelling.
The law of reflection of sound is an important law that explains various day-to-day phenomena like the occurrence of sound in an auditorium.
The repeated reflections of sound are known as reverberation and usually occur in the auditorium.
The properties of sound waves help in determining basic properties of sound like pitch, sound quality, and loudness.
The intensity of sound is referred to as the amount of sound energy that passes each second through a unit area.
An average human being can hear sounds that have a frequency range of 20 Hz - 20 kHz.
Sound waves that are below 20 Hz are known as infrasonic and sound waves above 20 kHz are known as ultrasonic.
The SONAR technique uses ultrasonic waves to predict the depth of the sea and locate submarines, sunken ships, icebergs, valleys, and water hills.
FAQs (Frequently Asked Questions)
1. What topics are included in Chapter 12 of the Class 9 Science Exemplar?
Chapter 12 of Class 9 Science exemplar contains questions of topics of utmost importance like:
Sound waves and their characteristics
Speed of sound in different media
Reflection of sound and reverberation
Range of hearing
Ultrasound and its applications
Structure of the human ear
2. What is the need for downloading the Class 9 NCERT exemplar for Chapter 12?
It is beneficial for students of Class 9 to download NCERT exemplar as this exemplar:
Contains solutions to questions present in NCERT textbook and NCERT exemplar book.
The solutions to each answer are provided in the simplest possible way so that it is understandable by Class 9 students.
The solutions are strictly based on the CBSE syllabus and not concepts different from the syllabus that has been discussed.
The questions are prepared in a pattern that is similar to the examination pattern and may help students during boards.
3. What type of questions are present in Chapter 12 of the Science NCERT exemplar?
The NCERT exemplar contains questions in the form of multiple-choice questions (MCQs), long answer questions, and short answer questions. These questions cover all levels ranging from easiest and then moving towards difficult questions. The exemplar contains 9 multiple-choice questions (MCQs), 8 short answer questions, and 3 long answer questions that cover all important concepts of Chapter 12 of Class 9 Science. These questions cover the complete syllabus of Science Chapter 12 prescribed in NCERT textbooks for Class 9. Thus, it will be beneficial for the students to go through all these questions.
4. How can Vedantu help me in preparing for my exams?
Vedantu contains a team of subject experts that prepare solutions for important questions from an examination point of view. These solutions are free to download and are available on the official website of Vedantu. Vedantu not only gives solutions to the NCERT exemplar but also covers extra questions, sample papers, and important questions from the previous year's question paper. It also provides students with certain tips and tricks that can be beneficial for the students in not only Class 9 examination but also in higher Classes and competitive examinations.
5. How can I ensure that I can answer all questions of Chapter 12 (Science) that will appear in the question paper?
Here are certain tips from our experts that will surely help you in attempting questions from Chapter 12, that is, sound:
A good understanding of the basic concepts is very important as that will only help you to solve difficult questions easily.
Practice numerical as much as you can so that you don't make any silly mistakes while attempting your question paper.
Practice important diagrams given in the Chapter, like, the structure of the human ear so that you can make a well-labelled diagram in your exam and don't lose any marks there.