CLASS 8 SCIENCE

GOOD MORNING STUDENTS,                                                             29TH APRIL 2020     For the worksheet that you will receive based on this chapter,you need to write only the answers in the notebook in case you can't take a printout.For those who can take a printout you may paste it in your CW notebook. I will be taking an online test of this chapter tomorrow.Revise the chapter well.                   1. Give examples which indicate that nylon fibres are very strong. 2. Explain why plastic containers are favoured for storing food.  3. Explain the difference between thermoplastic and thermosetting plastics. 4. Explain why the following are made of thermosetting plastics. (a) Saucepan handles (b) Electric plugs/switches/plug boards ...

HOME WORK                  SYNTHETIC FIBRES AND PLASTICS                 27TH APRIL,2020 DEAR STUDENTS This is your first homework related to this chapter.I have already shared with you the material that you can use to answer the following questions.However ,you are free to add any thing which is relevant based on your ncert textbook. Make sure you make the mind maps usings pencil.You may colour the mind maps using very light  pencil colours. Q1.Define the following terms: a)synthetic fibres (with examples) b)natural fibres (with examples) c)monomers d)polymers e)polymerisation Q2.Name the natural fibres obtained from plants and animals.( 3 each) Q3.Write the properties and uses of the following synthetic fibres. a)Rayon b)Nylon c)polyester d)acrylic Q4 .Why should we not wear synthetic clothes while working in the kitchen? Q5.Wh...

OMEWORK                  MICROORGANISMS -FRIEND AND  FOE          16th APRIL, 2020 Q9.How do vaccines work? Q10.Match the following:   COLUMN I                                                  COLUMN II a)Louis Pasteur                                           i) Penicillin b)Robert Koch                                            ii)Anthrax Bacterium c)Edward Jenner                                        iii)Fermentation d)Alexander Fleming        ...