CBSE Class 8 Science Sample Paper Set 21

CBSE Class 8 Science Sample Paper Set U.Sample Papers are the very important for every student. The sample papers should be practiced to gain extra marks in examinations. The sample papers have been prepared based on summative assessment1 and summative assessment 2 pattern. The sample papers have been prepared based on pattern of last year examinations and as per latest changes in the syllabus. Students, teachers and parents can download all CBSE educational material and very well prepared worksheets from this website.  All CBSE educational material is developed by our panel of teachers, have also been submitted by CBSE teachers and students. 

SECTION A

(Multiple choice questions i to xv carry 1 mark each)

1 Choose the correct option

i. The cell formed after fertilisation is called--------------

a) foetus b) zygote c) an embryo d) none of these

ii. The master gland in the body is --------------

a) adrenal b) pancreas c) thyroid d) pituitary

iii. With increase in height ( high altitude ) the pressure

a) decreases b) increases c) remains unchanged d) none of these

iv. The image formed by a plane mirror is------------------

a) real and inverted b) real and erect c) virtual and inverted d) virtual and erect

v. Which planet is called red planet -----------------------

a) Mars b) Saturn c) Earth d) Mercury

vi. Stream lined body of fish -----------------

a) increases friction b) decreases friction c) reduces weight d) increases weight

vii. g) An example of non-electrolyte is ------------------------ solution

a) sugar b) sodium chloride c) sodium hydroxide d ) sulphuric acid

viii. Earthing is provided in buildings to protect it from----------------------

a) cyclone b) thunderstorm c) lightning d) all of these

ix. The method of purification that does not kill germs----------------

a) distillation b) boiling c) chlorination d) filtration

x. When two forces act on opposite directions the net force acting is the-----------

a) sum of two forces b) difference between two forces c) both of these d) None of these

xi. Electroplating is based on---------------
a) magnetic effect of electricity b) chemical effect of electricity
c) heating effect of electricity d) Physical effect of electricity

xii. Potable water is --------------
a) clean b) colourless c) odourless d) all of these

xiii. Amoeba reproduces by the process of ––––––––––––
a) budding b) binary fission c) spore formation d) none of these

xiv. –––––––––––– hormone controls the level of blood sugar in the body
a) insulin b) adrenalin c) thyroxin d) none of these

xv. The envelope of air is known as ––––––––––––
a) lithosphere b) atmosphere c) thyroxin d) none of these

SECTION B

(Answer Questions 2 to 12 briefly and each carries 2 marks)

2. What are oviparous and viviparous animals?

3. Why do deep sea divers wear special suits?

4. Why is it easy to drag a mat from the floor, but it is difficult to drag the mat when somebody is sitting on it?

5. Distinguish between meteors and meteorites.

6. What is acid rain?

7. What is pole star? How do you locate the position of pole starwith the helpof Ursa Major?

8. Why is the word ‘Ambulance’ which is laterally inverted form in front of ambulance?

9. What is metamorphosis? Name an organism that undergoes metamorphosis?

10. Give one example each of situation in which you push or pull to change the state of motion of objects?

11. What is seismograph? Which scale is used to measure earthquake?

12. What is Ganga Action Plan?

SECTION C 

(Answer Questions 13 to 23 and each carries 3 marks)

13. Explain the construction and working of an electroscope?

14. Draw a circuit diagram to show conduction of electricity in lime juice?

15. Why do our bodies not get crushed due to atmospheric pressure?

16. What are artificial satellites? What are they used for?

17. Explain an activity to show that liquids exert equal pressure at the same depth?

18. Why do we need to reduce friction and how it can be decreased?

19. What is the cause of the changes in human body during puberty?

20. Explain contact and non contact forces with the help of two examples each.

21. Write the difference between regular and irregular reflection with diagram.

22. Write three measures to protect ourselves from lightening ?

23. What is puberty? State the changes at puberty.

Section D 

(Answer Questions 24 to 28 and each carries 4 marks)

24. Explain the process of sex determination of baby in human? (with diagram)

25. With the help of an activity show that force of friction depends on the nature of two surfaces in contact.

26. What is green house effect? How does it cause global warming and its effect?

27. Draw a neat labelled diagram of human eye. Mention two ways to take care of your eyes?

28. What are the various causes of water pollution?

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