Science

Note :

(i) All questions are compulsory.

(ii) Internal options are given in Q. Nos. 8, 11, 15, 17, 18, 20

and 22.

(iii) Q. Nos. 1 to 6 are Very Short Answer Type Questions.

Answer in about 30 words each.

(iv) Q. Nos. 7 to 12 are Short Answer Type Questions. Answer

in about 50 words each.

(v) Q. Nos. 13 to 17 are Short Answer Type Questions. Answer

in about 75 words each.

(vi) Q. Nos. 18 to 22 are Long Answer Type Questions. Answer

in about 150 words each.

(vii) Draw neat and clean labelled diagram wherever required.

(viii) Marks allotted to each question are mentioned against

the question.

1. Which main salts are found in the Sea water ? 2

2. What are Solar devices ? 2

3. What is Autotrophic Nutrition ? 2

4. Write the law of conservation of Energy. 2

5. Draw labelled diagram of Binary Fission in Amoeba. 2

6. What is Medulla Oblongata ? 2

7. "Technology leads to development." Explain with the help of

example. 3

8. What is Backlesh Error ? How is it avoided ?

(Or)

Pitch of Spherometer is 0.1 cm and least count is 0.0005 cm.

Calculate the number of divisions on head scale. 3

9. Differentiate between Vector and Scalar quantities. (Any

three). 3

10. Describe transportation method of material in plants. 3

11. Explain the mechanism of excretion of nitrogenous waste products through kidney.

(or)

Describe the excretory organs found in the body of human other

than kidney. 3

12. What are safety fuse wires ? Why are they used in homes ? 3

13. Write main uses of metal. (Any four) 4

14. What is the role of trees in balancing the environment ? 4

15. What is Fermentation ? Explain the importance of Fermentation.

(or)

Differentiate between Respiration and Breathing. 4

16. Why is digestion of food in the body called slow combustion ? 4

17. What are the uses of vegetative propagation ?

(Or)

How is it possible to control Fertilization ? 4

18. How is Hydroelectricity generated ? Explain with diagram.

(Or)

Describe the solar cell panel with diagram. Write down the

advantages of solar cell panel. 5

19. What are Nuclear Wastes ? Write the harmful effects of nuclear

radiations. 5

20. How are modern agriculture practices harmful for the

environment?

(Or)

What is an Ecological Pyramid ? Explain. 5

21. Graphite and diamond both are the allotropes of carbon, but graphite is a good conductor of heat and electricity while diamond is not, why ? Explain. 5

22. How is magnet magnetised by electrical effect ? Explain through

experiment.

(Or)

(a) Differentiate between an Electro-magnet and a Permanent

magnet. (Any three)

(b) The current flowing through a wire is 0.1 ampere, the potential

difference developed between its ends 3 volts. Calculate the

resistance of the wire. 5