Question 1 What is the speed of sound in air? Question 2 What is the speed of sound in water? Question 3 What is the speed of sound in solids? Question 4 Where would sound travel faster- in wood or water? Question 5 In which medium sound travel faster- air or iron? Question 6 When we put our ears to a railway line, we can hear the sound of an approaching train … [Read more...] about Speed of Sound
Class 8
Sound needs a Medium for Propagation
Question 1 What does the working of a toy telephone tell us about sound? Question 2 Name one solid, liquid and a gas through which sound can travel? Question 3 Why sound cannot travel through vacuum? Question 4 Define the term medium? Question 5 How can you show that sound cannot travel vacuum? Question 6 Why sound cannot be heard on the moon? Question 7 How … [Read more...] about Sound needs a Medium for Propagation
Sound Produced by Humans
Question 1 What is the length of vocal cords in a man? Question 2 Out of a man and a woman who has shorter vocal cords? Question 3 Out of a man and a woman who produces sound of higher pitch? Question 4 Name the sound producing organs in humans? Question 5 Which part of the body vibrates when we speak? Question 6 What is the name of the strings in human voice box … [Read more...] about Sound Produced by Humans
Sound is Produced by Vibrating Object
Question 1 How is sound produced? Question 2 What should an object do to produce sound? Question 3 How does a sound making object differ from one that is silent? Question 4 Name the part which vibrates to produce sound in drums, sitar and flute? Question 5 What brings the sound of a ringing telephone bell to our ears? Question 6 How does propagation of sound take … [Read more...] about Sound is Produced by Vibrating Object
Methods of Reducing Friction
Question 1 Why is the surface of slide polished to make it smooth? Question 2 Name 2 lubricants? Question 3 Why do we sprinkle fine powder on carrom board? Question 4 Which force gets reduced when two surfaces in contact are polished to make them smooth? Question 5 State one way in which the friction between wheel and axle can be reduced? Question 6 Why does … [Read more...] about Methods of Reducing Friction