Academic year: 2014-2015

Pre Summative Assessment – II Name : Grade : VIII (A)

Subject: Science Marks : 90 Date : 10.02.2015 Duration: 3 hrs________________________________________________________________________________

Section-A

1. What are the two types of charges? (1)2. Name the commonly used fire extinguisher. (1)3. Name two cells which can change their shape. (1)

4. Why do we consider the sun as a star? (2)5. Define ignition temperature. (2)6. State the difference between Eukaryotes and Prokaryotes. (2)

7. What are asteroids? (3)8. What is electric discharge? How does it occur? (3)9. What are the uses of kaleidoscope? (3)10. What are air pollutants? Write their sources. (3)11. What is green house effect? Name some green house gases. (3)12. Define calorific value and write its unit. (3)13. Why adolescents are also called as teenagers? (3)14. Explain asexual reproduction in hydra with diagram. (3)15. Write short notes on the following.

a. Cytoplasm b. Nucleus of a cell (3)16. Cells are the basic structural units of living organisms. Explain. (3)17. Differentiate between Internal fertilisation and External fertilisation. (3)18. What is Sperm? Explain its structure. (3)

19. How can you save yourself from lightning? (5)20. Explain how you can take care of your eyes? (5)21. Give reasons:

(a) Water is not used to control fires involving electrical equipment.(b) LPG is a better domestic fuel than wood. (5)

22. What are the three methods of purifying water? (5)23. Draw and label animal cell. (5)24. Define asexual reproduction. Describe two methods of asexual reproduction in animals

with examples. (5)

Section-B

25. The shaking of earth is called(a) Tsunami (b) Volcano (c) Earth quack (d) all of these (1)

26. The image formed by a plane mirror is(a) Real and inverted (b) Real and erect (c) virtual and inverted (d) virtual and erect (1)

27. A planet which appears yellowish is:(a) Asteroids (b) Mars (c) Uranus (d) Saturn (1)

28. The brightest planet is:(a) Mercury (b) Venus (c) Earth (d) Saturn (1)

29. _________________ is essential for combustion.(a) H2O (b) CO2 (c) O2 (d) H2 (1)

30. Global warming results in:(a) Melting of polar glacier (b) Rise in sea level(c) flood in coastal areas (d) all of these (1)

31. _____________is a poisonous gas which reduces the O2 carrying capacity of the blood.(a) Carbon monoxide (b) Carbon dioxide (c) Sulphur dioxide (d) Ozone (1)

32. Smog causes:(a) Asthma (b) Cough (c) Wheezing (d) all of these (1)

33. The power house of cell is called(a) Cell wall (b) Mitochondria c) Ribosomes (d) Nucleus (1)

34. Chloroplast is found in the (a) Plant cell only (b) Animal cell only (c) Both of these (d) None of these (1)

35. The number of nuclei present in a zygote is (a) One (b) Two (c) Four (d) None (1)

36. Larynx is called(a) Voice box (b) Music box (c) Respiratory organ (d) None of these

37. Value based question:Mr.Amrish has recently come back from an expedition to Antarctica. After few days

of his return, he developed a skin problem which the doctors have confirmed as skin cancer and suggested that it may be because of harmful radiations from the sun. (i) How do you think that Mr. Amrish has exposed to harmful radiations? (ii) Which layer prevent the entry of harmful radiations from the sun into the earth? (ii) What actions will you take to prevent global warming? (3)

☻☺...All the best...☺☻