Cell Structure and Functions — Science STD 8 — Question

The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.

Which is better material for constructing handle of a pressure cooker a thermoplastic or a thermosetting plastic?

What will you observe when the metal top of an electroscope is touched with a plastic comb rubbed in dry hair? Give reason for your answer.

How will you charge a glass rod by the method of friction?

What is a Virtual Image?

Name the various types of forces.

Explain why the number of meteors striking the moon’s surface is quite large whereas very few reach the Earth's surface.

Which one of the following is the most appropriate statement, and why are the other statements not appropriate?
(i) A saturated solution can still dissolve more solute at a given temperature.
(ii) An unsaturated solution has dissolved the maximum amount of solute possible at a given temperature.
(iii) No more solute can be dissolved into the saturated solution at that temperature.
(iv) A saturated solution forms only at high temperatures.

On what principle does a lens work?

CNG is a non-polluting fuel commonly used now-a-days. Explain in brief.