Cell - structure and functions — Science STD 8 — Question

Why does a fast car slow down if its engine is switched off?

What can be done along the roads to reduce noise pollution caused by traffic from reaching the residents of the area?

What is 'greenhouse effect'? State its importance for us.

If a vacuum is created between two Magdeburg hemispheres joined together, they cannot be separated easily, What presses the hemispheres together?

Name two common lubricants.

What is meant by gravitational force (or force of gravity)? Give its one example.

What is meant by kharif crops? Give two examples of kharif crops.

Explain why, a charged body loses its charge when we touch it with our hand.

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

Name the point inside the human eye where the image is not visible.