Explain radio telescopes?
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Explain the Types of Refrigeration ?
What is a Pressure ?
Explain reflection of light?
Why are the steam pipes and hot water pipes used for heating rooms, not fixed to the walls firmly at both ends ?
What is a Coal ?
Explain what instrument is used to measure volume?
When a glass cylinder is filled with water and a piece of thick paper is placed at the mouth and the cylinder is inverted, the paper dies not fall. Why ?
The gravitational force between two blocks is F what would happen if a mass of both the blocks as well as distance between them is doubled?
How is A.C. converted into D.C ?
what is the relative speed between 2 serial electrons running in same direction along the wire?
How does the snake move over the ground ?
Explain what is an electron?