Crop Production and Management. — Science STD 8 — Question

Distinguish between real and virtual images.

Write the effects of chemical reactions.

Write any 2 properties of hydrocarbons

What is the reason for hardness of water?

Mention the SI unit of specific heat capacity?

Ruthresh, Hari, Kanishka, and Thahera collected different samples of water from a well, a pond, a river, and underground water. All these samples were sent to a testing laboratory. The test result showed the ratio of hydrogen to oxygen as 1:8.
a. What conclusion would you draw from the above experiment?
b. Which law of chemical combination does it obey?

Define friction. Give two examples of the utility of friction in day-to-day life.

Your friend was absent from school yesterday. You are enquiring about his absence. He told that he had a fever and it was measured to be 100^oC. Is it possible to have a 100^oC fever? If he is wrong, try to make him understand.

Draw a ray diagram to show a light ray travels from denser medium (glass) to rarer medium (air).

Give some uses of electroplating.