Light — Science STD 8 — Question

Which disease(s) among the following may spread if drinking water gets contaminated by the excreta from an infected person?
Hepatitis A, Tuberculosis, Poliomyelitis, Cholera, Chickenpox.

Various plants of Pachmarhi reserve enhance its beauty. Name a few of them.

Name the phenomenon responsible for the following effect: When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.

State two methods of producing sound.

Explain how, manufacturing of synthetic fibres is actually helping in the conservation of forests.

Categorise the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’. Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.

What is meant by saying that metals are: Ductile

Stars appear as point while planets appear as discs. Explain why?

Name the various types of forces.