Class 9 Science
Sound
Question 1.
What do you understand by vibrations? How is the sound of human voice produce?
Question 2.
Give some main characteristics of sound waves.
Question 3.
What is wavelength?
Question 4.
How do you define the ‘time-period’ of a wave?
Question 5.
Define frequency.
Question 6.
The speed of sound primarily depends on:
(a) the nature of the transmitting medium.
(b) temperature of the transmitting medium.
(c) both (a) and (b).
(d) none of the above.
Question 7.
What does the law of reflection of sound state?
Question 8.
For hearing a distinct sound, the time interval between the original sound and the reflected one must be at least ____________________.
(a) 0.1 s.
(b) 0.2 s.
(c) 0.5 s.
(d) None of the above.
Question 9.
How do you define ‘reverberation’?
Question 10.
Define the term ‘loudness’.
Question 11.
What do you understand by ‘intensity of sound’?
Question 12.
The audible range of hearing for average human beings is in the frequency range:
(a) 20 Hz to 20 kHz.
(b) 5 Hz to 15 kHz.
(c) 10 Hz to 100 kHz.
(d) None of the above.
Question 13.
What is ‘SONAR’?
Question 14.
A ship sends out ultrasound that returns from the seabed and is detected after 2.50 s. If the speed of ultrasound through seawater is 2500 m/s, what is the distance of the seabed from the ship?
Question 15.
What do you understand by ‘echocardiography’?
Question 16.
Give some applications of Ultrasound.
Question 17.
What is ‘ultrasonography’?
Question 18.
What is ‘Stethoscope’?
Question 19.
A person clapped his hands near a cliff and heard the echo after 3 s. What is the distance of the cliff from the person if the speed of the sound, v is taken as 346 m-s–1?
Question 20.
Sound waves with frequencies below the audible range are termed as:
(a) Infrasonic.
(b) Ultrasonic.
(c) Both (a) and (b).
(d) None of the above.
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In summary, problem-solving after learning a theoretical concept on CBSE Sound Class 9 Science is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.
You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.
Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.
All About Daily Practice Problems on Class 9 Science Sound NCERT Chapter 12
Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 9 Science Sound NCERT Chapter 12 useful.
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