13. Sound Class 8 Science [LATEST] Solutions Additional Questions With Solutions in English - CBSE Study
NCERT Solutions for Class 8 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 13. Sound with detailed explanations and step-by-step answers for better exam preparation. Each Additional Questions With Solutions is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 8 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 8 English Medium Science All Chapters:
13. Sound
4. Additional Questions With Solutions
Additional Questions With Solutions
Ques: What is sound?
Ans: When an object vibrates, it produces sound.
Ques: What is eco sound?
Ans: When any sound reflects by striking on any medium, that sound heard us again and again. This is called eco sound.
Ques: What is minimum audible range for human ears?
Ans: The audible range is 20 Hz to 20,000 Hz.
Ques: What is minimum audible distance from sound source to barrier medium?
Ans: 17.2 m.
Ques: What is S.I unit of frequency?
Ans: Hz (Hertz).
Ques: What is S.I unit of wave length?
Ans: S.I unit of wave length is meter.
Ques: By what organ human produces sound?
Ans: Vocal cord. (Larynx)
Ques: How do we produce sound?
Ans: Two vocal cords, are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air When the lungs force air through the slit, the vocal cords vibrate, producing sound.
Ques: In which mediums sounds propagate?
Ans: Solid, liquid and gas.
Ques: In which medium sound does not propagate?
Ans: Vacuum.
Ques: What is eardrum?
Ans: The shape of the outer part of the ear is like a funnel. When sound enters in it, it travels down a canal at the end of which a thin membrane is stretched tightly. It is called the eardrum.
Ques: Write the function of eardrum.
Ans: The eardrum sends vibrations to the inner ear.
Ques: What is oscillatory motion?
Ans: The to and fro motion of an object is known as vibration. This motion is also called oscillatory motion.
Ques: What is frequency? Write is its S.I unit?
Ans: The number of oscillations or vibrations per second is called the frequency of oscillation. The frequency is expressed in hertz (Hz).
Ques: On which measure does loudness of sound depend?
Ans: On its amplitudes.
Ques: What are two important properties of sound?
Ans: Amplitude and frequency are two important properties of any sound.
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