Question
What is the difference between perihelion and aphelion.
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How plants get nutrients?
Distinguish between symptoms and signs of a disease.
Find the distance between a surface and source of sound, if speed of sound is 334m/ s and echo returns from the surface in 1.5s.
Define renewable resources?
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 33m/s.
A worker lives at a distance of 1.32km from the factory. If the speed of sound in air be 330m/s, how much time will the sound of factory siren take to reach the worker?
How many types of organisms are believed to be present on Earth?
Explain the term ‘pitch’ of a sound. On what factor does the ‘pitch’ of a sound depend?