Science
(Hindi & English Version)
Time : 3 Hours Maximum Marks :75
Note :(i) All questions are compulsory.
(ii) internal options are given in Question Nos. 8,11.14,16,
18,21 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 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 AnswerType 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 is Atmosphere ? 2
2. What do you mean by Combustion ? 2
3. Why is respiration known as biological oxidation ? 2
4. Name the two chemical elements used in the manufacture of solar cells. 2
5. What is Placenta ? What are its significance ? 2
6. What is the main function of Insulin ? 2
7. How is human life changed by the help of technology ? 3
8. Write differences between scalar and vector quantities. (Any three) 3
(Or)
You are given two Spherometers. Their pitches are 1 mm and
0.5 mm respectively. If the least count of each of them is 0.0005
cm, find the number of divisions on their circular head scales. 3
9. What precautions should be taken while using a Vernier
Callipers ? (Any three) 3
10. What is Lymph ? Write three points of similarity between blood
and lymph. 3
11. Write the differences between arteries and veins. (Any three)
(or)
Draw a neat and labelled diagram of Nephron of kidney. 3
12. What properties should magnetic keepers have ? (Any three) 4
13. Give the balanced chemical equation of the following reactions : (a) Action of Chlorine with Sodium
(b) Action of Hydrogen with Calcium
(c) Action of Oxygen with Magnesium
(d) Action of Hydrochloric acid with Zinc. 4
14. Write differences between respiration and combustion. (Any four)
(or)
Explain the importance of carbon dioxide in photosynthesis. 4
15. Why is water essential for our body ? Explain in three points. 4
16. Describe the various stages of Growth.
(Or)
What are Endocrine glands ? Make a list of four important hormones secreted by various glands of human body and write their
functions.
17. How was Coal formed in Earth ?
18. Draw a neat and labelled diagram of Solar Cooker.
(Or)
Explain the cause of energy production of the Sun.
19. Explain nuclear reactor under the following heads :
(i) Labelled diagram
(ii) Mechanism.5
20. Carbon is an unique element, how ? Why do organic compound
occur in a large numbers ? 5
21. What is water cycle ?
(Or)
What is Biosphere ? Explain its main components. 5
22. Explain the divide touch method of magnetization under the following heads :
(a) Labelled diagram
(b) Description
(c) Position of poles
(Or)
How is electric potential related to hydrostatics ? 5