CLASS 8
SUBJECT : SCIENCE 

DATE OF SUBMISSION: 31.05.2019

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DATE OF SUBMISSION: 25.07.2018

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DATE OF SUBMISSION: 15.07.2018

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DATE OF SUBMISSION: 05.07.2018
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DATE OF SUBMISSION: 25.06.2018
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DATE OF SUBMISSION: 15.06.2018

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DATE OF SUBMISSION: 05.06.2018

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DATE OF SUBMISSION: 31.05.2018

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DATE OF SUBMISSION: 03.01.2018

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DATE OF SUBMISSION: 07.12.2017

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DATE OF SUBMISSION: 05.11.2017

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DATE OF SUBMISSION: 05.11.2017

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DATE OF SUBMISSION: 06.10.2017

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DATE OF SUBMISSION: 20.08.2017

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Date of  Submission-15-7-17

1) Choose the correct answer:    (1x7 = 7)

             1. Which of the following can be beaten into sheets?

           a) Zinc    b) Phosphorous c) Sulphur    d) Oxygen                                                                                                                  

            2. Which of the following is an antibiotic?

                 a) Sodium bicarbonate    b) streptomycin   c) alcohol d) yeast 

              

            3. Fabric made by mixing two types of fibres is

    a) Polyester b) polythene     c) terrycot d) bakelite

            4. The first truly synthetic fibre manufactured was

                a) Rayon b) nylon      c) acrylic      d) polyester

            5. The bacteria that helps in nitrogen fixation is

                a) Lactobacillus b) rhizobium      c) penicillium d) spirogyra

            6. Copper cannot displace zinc from its salt-solution because

                 a) copper is less reactive than zinc. b) Zinc is less reactive than copper c) copper

               and zinc  are having same reactivity   d) copper is a  metal

                

            7. Non-stick coating on cook wares.

                a) acrylic b)polyester c) Teflon d) melamine

   II) Answer in two or three sentences:   (2x4= 8)

           8. Why is it not advisable to wear polyester clothes while working in the kitchen?

           9. What is advantage of using LED over bulb in testing the electrical conductivity of liquids?

          10. Why should we be careful while taking antibiotics?

          11. What is the effect of plastics in our environment?

IV) Answer briefly    (3x5 = 15)

                          

12. What will happen to ‘unused kneaded flour’ if they are left in the open for a day or two?

         

13. Fill in the missing boxes of  the  nitrogen cycle diagram.   

           

         

14. Write the differences between thermoplastics and thermosetting plastics

Date of  Submission-5-6-17

1. Which of the following reproduces only inside a host cell? (a) Bacteria (b) Amoeba (c) Virus (d) Fungus.

2. A disease in human beings caused by virus is _______. (a) typhoid (b) dysentry (c) influenza (d) cholera

3. Pathogenic micro-organisms present in  host cells are killed by medicines called (a) pain killer (b) antibiotics (c) antibodies (d) vaccines

4. The two micro-organisms which live in symbiotic association in lichens are (a) fungus and protozoa (b) bacteria and protozoa (c) alga and bacteria (d) alga and fungus

 5. The gas released during the preparation of bread is (a) oxygen (b) nitrogen (c) carbon dioxide (d) sulphur dioxide

 6. The disease caused by a protozoan and spread by an insect is _________. (a) dengue (b) polio (c) malaria (d) measles

 7. Paheli dug two pits, A and B, in her garden. In pit A, she put a polyhtene bag packed with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She, then covered both the pits with soil. What did she observe after a month? (a) Waste in pit A degraded faster than that in pit B. (b) Waste in pit B degraded faster than that in pit A. (c) Waste in both pits degraded almost equally. (d) Waste in both pits did not degrade at all.

8. Unscramble the jumbled words underlined in the following statements.

 (a) Cells of our body produce santiidobe to fight pathogens.

 (b) curbossulite is an air-borne disease caused by a bacterium.

 (c) Xanrhat is a dangerous bacterial disease.

(d) Yeasts are used in the wine industry because of their property of meronettinaf.

Date of submission-5 June2017

To be done in HW notebook

1. Observe the techniques used by farmers for cultivation of crops and write a report.

2. Conduct a survey of family members (at least 10) about the diseases they had and how they were cured of the disease. Write a report of the diseases and their cure. 

DATE OF SUBMISSION-27-2-17

1. Beera, wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen. Which crop replenishes nitrogen and why?

2. (a) Name the tool used with a tractor for sowing seeds in a field. (b) What are the advantages of using this tool?

3. (a) Name the practice followed for large scale rearing of farm animals. (b) What facilities are provided to farm animals?

4. Paddy is a major cereal crop in our country. (a) In which season is paddy cultivated? (b) Discuss the method of sowing. (c) What measures must be taken to prevent spoilage and insect attack of harvested grains.

5. A star is ten light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?

6. Meteors are not visible during the daytime. Explain the reason.

7. Name the part of the eye which gives colour to the eyes.

8. Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?

9. How many times is a ray of light reflected  by two plane mirrors placed parallel and facing each other?