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CBSE Class 10 - Science

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CBSE X - Set -2
SCIENCE PAPER 2009

Time allowed: 150 minutes; Maximum Marks: 60

General Instructions:
1)  All questions are compulsory.
2) The question paper consists of 27 questions divided into 4 sections A, B, C and D. Section A comprises questions of 01 mark each, Section B comprises questions of 02 marks each, Section C comprises questions of 03 marks each and Section D comprises questions of 05 marks each.
3)  All questions in Section A are to be answered in one word, one sentence or as per the exact requirement of the question.
4) There is no overall choice. However, internal choice has been provided wherever necessary.You have to attempt only one of the alternatives in all such questions.
5)  In question on construction, drawing should be near and exactly as per the given measurements.
6) Use of calculators is not permitted.

SECTION A

Question 1

1. Balance the following chemical equation:

Pb(NO3)2(s) →PbO(s) + NO2(g) + O2 (g)

Question 2

2. Fresh milk has a pH of 6. When it changes into curd (yogurt) will its pH value increase or decrease? Why?

Question 3

3. Name a reducing agent that may be used to obtain manganese from manganese dioxide.

Question 4

4. Why does a ray of light bend when it travels from one medium into another?

Question 5

5. Draw the given diagram in your answer book and complete it for the path of ray of light beyond the lens.

Question 6

6. Why does sky look blue on a clear day?

Question 17

17. What are the two main components of our environment?

Question 18

18. What will happen to a plant if its xylem is removed?

Question 19

19. Name two tissues that provide control and coordination in multicellular animals.

SECTION B

Question 7

7. A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals?

Question 8

8. a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?

(b) Name the products formed on strongly heating ferrous sulphate crystals.

Question 9

9. What is the minimum number of rays required for locating the image formed by a concave mirror for an object? Draw a ray diagram to show the formation of a virtual image by a concave mirror.

Question 10

10. A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.

Question 20

20. What are natural resources? State two factors that work against an equitable distribution of these resources.

Question 21

21. What is water harvesting? Mention any two water harvesting structures.