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Guess Paper – 2008

Class – X

Subject - Science

Time: 2.5 hours Max. Marks:60

General instructions:-

• The question paper comprises of two sections and you have to attempt both the sections.

• Question no.1 to 6 in section A and question no.17 to 18 in section Bare of 1 mark each.

• Question no. 7 to 10 in section A and question no.14 to 22 in section B are of 2 marks each.

• Question no.11 to 14 in section A and question no.23 to 25 in section B are of 3 marks each.

• Question no.15 to 16 in section A and question no.26 in section B is of 5 marks each.

SECTION – A

1. Name the cell of retina which respond to the intensity of light and colour of the object.

2. State modern periodic law.

3. Why does the colour os CuSO₄ solution change when an iron nail is dipped in it?

4. Name the rule used to determine the direction pf magnetic field in a current carrying conductor.

5. Why does an aqueous solution of an acid conducts electricity?

6. Which bulb has greater resistance, a 100 watt bulb or a 60 watt bulb?

7. Identify the substance oxidized or the substance reduced:-

(i)4Na +O₂  2Na₂O

(ii)CuO + H₂  Cu + H₂ O.

8. A solution of ‘X’ is used for white washing.

   1. Name the substance X and write it’s chemical formula.

   2. Write the reaction of X with H₂ O.

9. A 4 ohm resistance wire is doubled on it. Calculate the new resistance of the wire. OR

Define power of a lens. Aconcave lens of focal length 10cm, what is the power of lens?

10. What do you mean by corrosion? State two ways to present the rusting of iron.

11. A 2 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 10 cm. The distance of the object from the lens is 15 cm. Find the nature, position nd size of the image, also find the magnification.

12. An atom has electronic configuration 2,8,7

(i) What will be the atomic no. of this element.

(ii) To which of the following element would it be similar?

N(7), F(9), P(15), Ar(18)

(iii) State whether it is a metal or a non metal.

13. A copper wire has diameter 0.5mm and resitivity of 1.6 X 10^-8 ohm meter. What will be the length of this wire to make its resistance 10ohm? How much does the resistance change if the diameter is doubled?

14. What do you mean by magnetic field and field line? Write the three properties of magnetic field lines.

15. With the help of a labeled diagram describe two common defects of vision in human eye with their main causes .What type of lenses are used in spectacles to correct their defects?

16. Give reasons for the following:-

(i) Platinum, gold and silver are used for making jewellery.

(ii) Na , K and Li are stored under Oil.

(iii) Aluminium is highly reactive, yet it is used to make utensils for cooking.

(iv) POP shold be kept in a moisture proff container.

(v) Curd ans sour substance should not be kept in brass and copper vessels?

OR

Describe the working of a bio gas plant, with a help of diagram.

SECTION – B

13. Give an example of a plant hormone that promotes growth.

14. What is food chain?

15. What do u mean by bio degradable waste? Which of the following is biodegradable

Agricultural waste, Plastic, insecticide and sewage

20. Draw a neat and labelled diagram of female reproductive system.

OR

Draw a neat and labeled diagram of human urinary system.

21. Write two advantages of vegetative propagation.

22. What are Acquired and inherited traits?

23. A man with blood group ‘A’ marries a woman with blood group ‘O’ and their offspring has blood group ‘O’. Is this onformation enough to tell you which of the trait is dominant? Why or why not?

24. What is the difference b/w aerobic and anaerobic respiration?

25. How is the sex of a child determined?

OR

Explain the process of fertilization in plants with the help of a diagram.

26. What is double circulation ?explain it with a systematic diagram of flow of blood in human body.