Science
(Hindi & English Version) Time : 3 Hours Maximum Marks : 75
Note :
(i) All questions are compulsory.
(ii) Internal options are given in Question Nos. 9,11, 16,17,
19, 21 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 Very 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.
(viii) Marks of each question are indicated against it.
1. What do you mean by Contaminated Water ? 2
2. Write the Law of Conservation of Energy. 2
3. Define Photosynthesis with the help of chemical equation. 2
4. What is Biogas ? 2
5. What is external fertilisation ? 2
6. Why is pituitary gland called master gland ? 2
7. Write the names of scienstists who invented the following :
(a) Steam engine
(b) D.D.T. insecticides
(c) Dynamite. 3
8. Write down the uses of Vernier Callipers. 3
9. 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
10. Write down the functions of kidney. 3
11. Write down the difference between Xylem and Phloem.
(Or)
Explain the working of human heart. 3
12. Under which conditions Magnetism destroyed ? 3
13. Compare the physical properties of metals and non-metals. 4
14. Name the main pollutants in air. How are they originated ? 4
15. Why is the calorific value of methane higher than butane ? 4
16. What is Fermentation ? Explain the importance of Fermentation.
Or)
Differentiate between Respiration and Breathing. 4
17. Describe different sages or growth.
(or)
Write functions of growth inhibitors (ABA) and Gibberellins. 4
18. 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
19. Describe water cycle in nature. 5
(or)
Explain Nitrogen Cycle with the help of diagram. 5
(or)
What is Electric resistance ? On what factors for a solid conductor
does it depend ? 5