Exploring Forces — Science STD 8 — Question

What name is given to the phenomenon in which the earth shakes suddenly for a very short time?

Write the range of a very strong earthquake on the Richter scale.

Which celestial body is seen as a bright streak of light coming down the night sky?

What is global warming? Name the gas responsible for causing global warming.

Describe the different ways in which microorganisms can be harmful.

Why we don’t use non-metals for making jewellery?

What are fuels? Name any two common fuels.

Paheli and Boojho want to remind you that one should not experiment with the electric supply from the mains or a generator or an inverter. Why?

What is the shape of the top end of a lightning conductor?

What is a systematic investigation?