Light — Science STD 7 — Question

What is crown of the tree?

Explain the reason for wrapping of ice in gunny bags.

There is a colourful bird that has a long and large beak, and lives in the tropical rainforest. Which bird is this?

Briefly tell that how many reflected rays can be obtained from a single incident ray in respect of a plane mirror.

What is the common property of most of the clocks?

Boojho says, "My left hand tells me that the water in mug C(in Activity 1) is hot and the right hand tells me that the same water is cold." What should we conclude?

What causes the different seasons on Earth?

Blood performs various functions including protection against infections. How?

If you cut off a paper into various pieces, is there any change in the property of the paper?

Why are hollow bricks used to construct the outer walls of houses in hot regions?