Question
How will you demonstrate that water vapour is present in air?
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Define soil erosion? Describe causes of soil erosion.
Write short notes on the following disesases:
AIDS.
A heavy car A of mass 2000kg travelling at 10m/s has a head-on collision with a sports car B of mass 500kg. If both cars stop dead on colliding, what was the velocity of car B?
Describe structure and functions of plasma membrane.
Describe structure and functions of bone.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.