Answer the following questions
Help in this pls no irreverent answer it will be reported
Answers
Explanation:
12- (a) weeds are removed by uprooting them, using weedicides,using implements like harrow or rake. process - weeding.
12-(b) they easily catch fire, on heating , the fabric melts and gets stick to the body that causes great harm.
13-(a) thermoplastics are those which can be melted on heating and remoulded in desired shape e.g.PVC
thermosetting plastics are those which once moulded, do not melt or become soft on heating. these are hard and stronger and retain their shape.e.g. bakelite, melamine.
(b)- PET is used for making containers of microwave,storage of food items.
14-(a) this is because trucks and buses are heavier than cars so wheels of buses and trucks are heavier as when area of a surface is increased the pressure on the object decreases.