Improvement in Food Resources — Science STD 9 — Question

In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
3. Assertion is true but the Reason is false.
4. The statement of the Assertion is false but the Reason is true.

Assertion: Medicine are easily absorbed by our body in colloidal form.
Reason: It is because they have large surface area and therefore, absorbed easily.

In which medium sound travels faster: air or hydrogen?

Out of solids, liquids and gases:
In which medium sound travels slowest?

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.

Which noble gas has less than 8 electrons in the valence shell of its atom? What is this number?

Define pressure.

Name three castes of honey bee farnily.

What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?

Give two limitations of using manure.