What conclusion do you get from the observation that if you hold a thin strips of paper just below your lips and blow air over its surface from your mouth, the strip of paper lifts up ?

Explain why, if you hold a thin strip of paper just below your lips and blow air over its surface from your mouth, the strip of paper lifts up.

What conclusion do you get from the observation that a fountain of water is created at the leaking joint of pipes of the main water supply line ?

What conclusion do you get from the fact that it is difficult to ride a bycicle against the direction of wind?

What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z ? Give your answer in a tabular form.

A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student ? Give reason for your answer.

Take a small stone. Hold it in your hand. What are the forces acting on the stone ? Now release the stone. What do you observe ? What are the forces acting on the stone after you release it ?