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Mathematics Solutions for Class 8 Math Chapter 2 - Parallel Lines And Transversal Jan 22, �� You can refer to NCERT Solutions for Class 8 Maths to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.. Class 8 Maths MCQs Multiple Choice Questions with Answers. Practicing these CBSE NCERT Objective MCQ Questions of Class 8 Maths with Answers Pdf will guide students to do a quick revision for all the . NCERT Solutions for Class 8 Maths are created by top experts of the subject who have reviewed and re-examined the answers of textbook questions and keep updating and cross-checking the NCERT 8 Maths solutions very frequently. The language used in NCERT Class 8 Maths Chapter 11 Question Answer Github 8th solutions for Class 8 is a very student-friendly language. Extensive stock questions and answers based on CBSE Class 8 curriculum managed by experts; Meritnation makes sure that students of CBSE Class 8 have a strong foundation when it comes to conceptual knowledge. Our study notes, videos, sample papers and activities for CBSE Class 8 are created and handled by subject experts.
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The displacement of the ball is a measure of the amplitude of vibration of the tumbler. Now, strike the tumbler gently and then with some force. Compare the amplitudes of vibrations of the tumbler in the two cases. In which case is the amplitude larger? Solution: The sound produced is louder when the tumbler is struck hard. The amplitude of vibration of the tumbler is larger when the glass is struck hard. Thus the loudness of sound depends upon the amplitude of vibration. Sound can travel through.

Voice of which of the following is likely to have minimum frequency? Question 4. Fill in the blanks with suitable words. Define vibration. Answer: Vibration is the to and fro or back and forth motion of an object. Which part of the human body is responsible for producing sound? What is the length of vocal cords in men?

Answer: The vocal cords in men are about 20 mm long. Can sound travel in vacuum? Answer: No, sound cannot travel in vacuum. What is meant by oscillatory motion? Answer: The to and fro motion of an object is known as oscillatory motion. Define frequency. Answer: The number of oscillations per second is called the frequency of oscillation.

Define 1 hertz. Answer: A frequency of 1 hertz means one oscillation per second. How are frequency of a sound and pitch related? Answer: If the frequency of vibration is higher then the sound has a higher pitch. Whose voice has a higher frequency � man or woman?

Answer: The voice of woman has higher frequency. What is range of audible sound? Answer: Sound of frequency 20 Hz to 20, Hz is the audible range. Which animal can hear sounds of frequencies higher than 20, Hz? Answer: Dogs can hear frequencies higher than 20, Hz. What is meant by base loudness level? Answer: The base loudness level is defined as that loudness of sound that the human ear can just perceive.

What is meant by noise pollution? Answer: Presence of excessive or unwanted sound in the atmosphere is called noise pollutipn. If the frequency of a sound is below 20 Hz, will it be audible to human beings? Answer: No, it will not be audible. In which state of matter does sound travel the. What happens to sound when it strikes a surface? Answer: Sound gets reflected on striking a surface. Why do we hear the sound of the hom of an approaching car before the car reaches us?

Answer: This happens because the speed of sound is much greater than the speed of the car. How do plants help in reducing noise pollution? Answer: Plants absorb sound and so help us in minimizing noise pollution. How can we control the sources of noise pollution? Answer: We can control noise pollution by designing and installing silencing devices in machines.

How can a hearing impaired child communicate? Answer: A hearing impaired child can communicate effectively by using sign language. If the amplitude increases 3 times, by how much will the loudness increase? Answer: If the amplitude increases three times, the loudness will increase by a factor of 9. The frequency of a given sound is 1. How many vibrations is it completing in one second? Which characteristic of a vibrating body determines.

Why do we not hear echoes in our ordinary surroundings? Answer: We do not hear echoes in our ordinary surroundings because the distance to hear echo should be more than 17 m. We cannot hear the sound of the exploding meteors in the sky, though we can see them. Answer: Sound cannot travel through vacuum.

In space there is vacuum. Light can travel through vacuum, so we can see the exploding meteor but cannot hear the explosion. We can hear the supersonic jet planes flying. Answer: The supersonic jet planes fly in the air. Since sound can travel through air, we can hear then flying. What are vocal cords? What is their function? The vocal cords vibrate and produce sound.

When does a thud become music? How do birds and insects produce sound? Answer: Birds chirp with the help syrinx in their wind pipe. Insects produce sound by flapping their wings.

What is the function of eusfachian tube in human ear? Answer: The vibrations of the spoken words reach our ears through eustachian tubes. Can a hearing impaired child speak?

If not why? Answer: A child having hearing impairment can not speak because if he is able to hear, he will leam to speak. Can sound travel through water? How do whales communicate under water? Answer: Yes, sound can travel through water. Since sound can travel through water, the whales can communicate with each other.

How is the pressure variation in a sound wave amplified in human ear? Answer: The pressure variation in a sound wave causes vibrations in the eardrum. These vibrations are amplified several times by the three bones. The hammer, anvil and stirrup. How is that you can hear a friend talking in another room without seeing him? Answer: Sound can travel in all directions and around comers. Light cannot travel around comers.

Therefore, we can hear a friend talking in another room but cannot see him. List sources of noise pollution in your surroundings. What are the effects of noise pollution? Answer: Due to noise pollution a person may suffer from lack of sleep, hypertension and anxiety.

If a person is exposed to noise continuously he may get temporary or permanent deafness. How can the noise pollution be controlled in residential area?

What happens when we pluck the strings of a sitar? Answer: When we pluck the strings of a sitar, the whole instrument vibrates and the sound is heard. Why is the voice of men, women and children different? Answer: The voice of men, women and children are different because the length of vocal cords are different. The length of vocal cords is longest in men and shortest in children.

How are we able to hear sound? Answer: The eardrum is like a stretched rubber sheet. Sound vibrations make the eardrum vibrate. The eardrum sends vibrations to the inner ear. From there, the signal goes to the brain and we are able to hear.

What sources in the home may lead to noise? Answer: Television and transistor at high volumes, some kitchen appliances, desert coolers, air conditioners all contribute to noise pollution. What is the-difference between noise and music? Can music become noise sometimes,? Answer: Unpleasant sounds are called noise. Music is a sound which produces a pleasing sensation. If the music is too loud, it becomes noise. Draw a labelled diagram showing the structure of the human ear.

Give some suggestions by which we can keep our ears healthy. Can you hear the sound on the moon? Answer: We cannot hear the sound on the moon because sound requires a material medium to travel. On the moon there is no atmosphere and sound cannot travel in vacuum. What are ultrasounds? How are they useful to us? Answer: Sound having frequency higher than 20kHz is known as ultrasound, is used for. The larynx has two vocal cords, which are folds of tissue with a slit like opening between them.

When we speak, air passes through the opening and the vocal cords vibrate to produce sound. Therefore, even though thunder and lightning take place simultaneously, we see Class 6 Maths Chapter 10 Question Answer Amazon the lightning earlier. What is the use of ultrasound in medicine and industry? Answer: Use of ultrasound in medicine :.

What is a sonogram? Why is it preferred to X-rays? Answer: Sonogram is image of the internal organs. Ultrasound can pass through the human body and are reflected back. The reflections are recorded by computer and images are generated on the screen. Sonogram is not harmful and is therefore used for studying the foetus or stone or tumor in the organs. On the other hand, X-rays can be harmful if humans are exposed for longer time.

The maximum displacement of a vibrating body on either side of its mean position, is known as its a Frequency b Loudness c Amplitude d Pitch Answer: c. The vibrating body is a completing 1, vibrations in one second. A given sound is inaudible to the human ear, if a its amplitude is too small. Answer: d. Sound can propagate a through vacuum as well as gases b only through gases and liquids c only through gases and solids d any of the three states of the matter. When lightning and thunder take place, they a occur together and are also observed together.

Sound cannot travel in a vacuum. The number of oscillations per second of a vibrating object is called its time period. If the amplitude of vibration is large, the sound is feeble. For human ears, the audible range is 20 Hz to 20, Hz. The lower the frequency of vibration, the higher is the pitch.

Unwanted or unpleasant sound is termed as music. Noise pollution may cause partial hearing impairment. Answer: Following are the major sources of noise pollution: Sound of vehicles Sound of kitchen appliances Sound of bursting crackers Sound of loudspeakers, TV, transistors Question Sound can travel through Gases only Solids only Liquids only Solids, liquids and gases.

Answer: Solids, liquids and gases. The unit of frequency is ����� Unwanted sound is called �����. Shrillness of a sound is determined by the �����.. Answer: time period amplitude Hertz noise frequency Question 6. In which state of matter does sound travel the slowest fastest? Answer: Air. Which characteristic of a vibrating body determines loudness pitch of the sound produced by it? Answer: Amplitude. In our body which part of the ear receives sound waves? What may happen if the eardrum is absent from our ear?

Answer: Pinna helps in receiving sound waves. If the eardrum is absent we would not be able to hear. Give an example each of: stringed instrument percussion instrument wind instrument striking instrument Answer: Violin Drums Flute Jal Tarang Question Answer: The noisy operations must be conducted away from residential areas.

Noise producing industries should be set away from such areas. Use of automobile horns be minimized. TV and music systems should be run at lower volumes. Answer: Question What is the function of: External ear. Internal ear. Answer: The external ear helps us in receiving the sound waves and directing them to the eardrum. Our study notes, videos, sample papers and activities for CBSE Class 8 are created and handled by subject experts.

These professionals know what students need to Class 5 Math Chapter 9 Question Answer Data score well in their CBSE Class 8 examinations and absorb the knowledge too. All rights reserved. Aakash EduTech Pvt. Thank you for your interest.

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