2. A non-contact force which can attract as well as repel objects. What is it?
3. Name a metal that can be cut with a knife.
4. What do you mean by polymerization?
s. Which leaves are used by farmers to protect their crops from weeds and insects?
6. How friction is responsible for forest fires?
7. If you hear a firecracker 3 seconds after it is fired, how far away from it are you?
(assume the speed of sound in air to be 330 m/s)
8. List two characteristics of plastics.
9. Write any two uses of chlorine.
10. Why should you wash your hands before eating?
11. What do you understand by the terms "Afforestation" and "Reforestation"?
Answers
Answered by
12
Answer:
2-Magnetic forces are non contact forces; they pull or push on objects without touching them. Magnets are only attracted to a few 'magnetic' metals and not all matter. Magnets are attracted to and repel other magnets
Explanation:
3- Sodium
4-Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer. ... The monomer molecules may be all alike, or they may represent two, three, or more different compounds.
Similar questions