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Class 9

Reflection of Sound

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 What is meant by reflection of sound? Question 2 What type of surfaces are best for reflecting sound? Question 3 State the laws of reflection? Question 4 Define the term echo? Question 5 Why  an echo is heard sooner on a hot day? Reflection of Sound Sound can also be made to change its direction and bounce back when it falls on a hard surface. The … [Read more...] about Reflection of Sound

Carbon Cycle

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

carbon cycle

Question 1 Describe how carbon is cycled in the environment? Question 2 How carbon exist in combined form? Question 3  Draw carbon cycle? Carbon Cycle Elemental form of carbon is diamond and graphite. Combined form of carbon is (1) Carbon dioxide in atmosphere carbonates (2) Carbonates and hydrogen carbon salts in minerals (3) Carbon containing molecules like … [Read more...] about Carbon Cycle

Nitrogen Cycle

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

nitrogen cycle

Question 1 What is ammonification? Question 2 What is nitrification? Question 3 What is denitrification? Question 4 Draw nitrogen cycle? Question 5 Name a nitrogen fixing bacteria of non-leguminous plants? Question 6 Define nitrogen fixation? Question 7 Explain nitrogen cycle? Nitrogen Cycle 78% of our atmosphere is nitrogen.  Nitrogen is a part of many … [Read more...] about Nitrogen Cycle

Human Ear

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

human ear

Question 1 Name that part of ear which vibrates when outside sound falls on it? Question 2 Name the tiny bones present in middle part of ear? Question 3 What is the function of tiny bones in the middle ear? Question 4 Name the tube which connects the middle ear to throat? Question 5 Explain the working of ear? Question 6 Name the nerve which carries electrical … [Read more...] about Human Ear

Sound

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 Define sound? Question 2 What type of wave are sound wave in air? Question 3 Name two types of sound waves which are generated in a long spring? Question 4 What are mechanical waves? Question 5 Explain the term compression? Question 6 Explain the term rarefaction? Sound Sound is a form of energy .It is that form of energy which makes us hear. … [Read more...] about Sound

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