The Fundamental Unit of Life — Science STD 9 — Question

Name the laws involved in the following situation:
The sum of products of masses and velocities of two moving bodies before and after their collision remains the same.

A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated?

This photograph shows a man-made 'communication satellite' going round the earth in a circular orbit (or circular path). We can see the dish antennae and solar panels (made of solar cells) clearly in this photograph.

This photograph shows a watch. The tip of seconds 'hand of this watch moves rapidly on the dial of the watch. The tips of minutes' hand and hours' also move on the dial but they move slowly.

Name two indigenous breeds of draught cows.

Differentiate between the following:
Mixed cropping and Inter cropping.

Name a metal:
Which is yellow in colour.

Group the following and tabulate them as energy yielding, protein yielding, oil yielding and fodder crop.
Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudan grass, lentil, soyabean, groundnut, castor and mustard.

Describe how drying of food grains is done.