Science Class – X 2007 (Set 5)

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Science

(Hindi & English Version)

Time : 3 Hours Maximum Marks :75

Note :

(i) All questions are compulsory.

(ii) Internal options are given in Question Nos. 10, 11, 15,

17,18,19 and 21.

(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 t'pe 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. Write the name of the chemical responsible for ozone hole in the

ozone layer. 2

2. What is work ? Write its unit. 2

3. Write the kinds of organism on the basis of nutrition. 2

4. What do you mean by 'Hydro-electricity' ? 2

5. Which structure is formed soon after fertilization ? 2

6. Why is Iodine necessary in salt ? 2

7. Write the name of the scientists who had invented the following:

(a) Telescope

(b) Aeroplane

(c) Rocket with liquid fluid 3

8. What precautions should be taken while using screw gauge ? 3

9. Write the importance of red blood corpuscles and white blood

corpuscles. 3

10. What is the reason that excretory system is not well-developed in plants ?

(Or)

How does transport of materials occur in unicellular organisms ? 3

11. Write differences between scalar and vector quantities. (any three)

(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

12. Why is magnetism lost on heating ? 3

13. Write differences between metals and non-metals. (any four) 4

14. What is the effect of polluted water over aquatic organisms ?

Explain. 4

15. Write differences between respiration and combustion. (any four)

(Or)

Explain the importance of carbon dioxide in photosynthesis. 4

16. Kerosene burns with blue flame in stoves but produces yellow

flame on burning in a lamp, why ? 4

17. Define fission and explain it with example of unicellular organism.

(Or)

What are the functions of Auxin ?

18. Verify Ohm's law in laboratory on the following headings: (a) Ohm's law

(b) Circuit diagram

(c) Observation table

(d) Two precautions

(Or)

Write three essential features of molecular theory of magnetism. 5

19. Draw a neat and labelled diagram of solar cooker.

(Or)

Explain the cause of energy production of the sun. 5

20. Write the working of Solar Battery. 5

21. What role organism play in :

(a) Water cycle

(b) Oxygen cycle

(c) Nitrogen cycle

(Or)

"In a food chain, the energy available at each successive level is

10% of the previous level." Explain this statement with example. 5

22. Carbon is an unique element, how ? Why do organic compound

occur in a large numbers ? 5

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