Science

Note :(i) All questions are compulsory.

(ii) internal options are given in Question Nos. 10, 11, 16,17,18,19 and 22.

(iii) Question Nos. 1 to 6 are Very Short Answer Type Questions. Answer in about 30 words each.

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

Answer in about 50 words each.

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

Answer in about 75 words each.

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

Answer in about 150 words each.

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

(vii) Marks of each question are indicated against it.

1) What is oil slick ?2

2) Draw labelled diagram of oxygen evolves during photosvnihe . 2

3) Write the law of Conservation of Energy. 2

4) Write two uses of Biogas. 2

5) What is Reproduction ? Write the different kinds of Reproduction? 2

6) What do you mean by Plant Hormones ?2

7) What is the role of technology in Industrial Revolution ? 3

8. What precautions should be taken while using physical balance ?

Write any three. 3

9) Why is nephron called dialysis bag ? 3

10) Write the differences between Blood and Lymph.

(Or)

Write down the functions of Haemoglobin. 3

11) 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

12. Magnet cannot be separated into North pole and South pole.

Why ? 3

13. Explain in detail the corrosion of metals. 4

14. Explain green house effect. 4

15. Why is charcoal good fuel in comparison to wood ? 4

16. What is Tissue Culture ? Explain.

(Or)

Write main functions of brain. 4

17. What is Fermentation ' Explain the importance of Fermentation.

(or)

Differentiate between Respiration and Breathing. 4

18. What will be the result of absence of decomposers in an

ecosystem ?

(or)

Differentiate between Food chain and Food web. 5

19.How is Hydroelectricity generated ? Explain with diagram.

(Or)

Describe the Solar Cell Panel with diagram. Write down the

advantages of solar cell panel.

20. Graphite and Diamond both are the allotropes of carbon. but

graphit= is good conductor of heat and electricity while diamond

is not, why ? Explain. 5

21. Differentiate between a Chemical reaction and a Nuclear

reaction. 5

22. Explain Paramagnetic. Ferromagnetic and Diamagnetic substances with example.

(Or)

What is an Electrical Resistance ? In series and parallel, find the

formula for the total resistance in each case. 5