The lid of a tea pot is provided with a hole, why?

State two properties of a hole.

Hole is

The bags and suitcases are provided with broad handles. Explain why.

Why are tall building provided with metallic rods, running from the top of building to the ground?

Why is a match stick lighted on rubbing it on the rough surface provided on the side of the match box?

Coffee is coming out from a conical filter, with height and diameter both are 15 cm into a cylindrical coffee pot with a diameter 15 cm. The rate at which coffee comes out from the filter into the pot is 100 cu cm/min. The rate (in cm/min) at which the level in the pot is rising at the instance when the coffe in the pot is 10 cm, is

A 12 m tall tree is to be photographed with a pin hole camera. It is situated 15 m away from the pin hole. How for should the screen be placed from the pin hole to obtain 12 cm tall image of the tree?