CBSE Class 10 Science Sample Paper 2015 Set D

SECTION: ‘A’

1. Write the atomic number of any two of the following elements. 

(a) Ar (b) Si (c) Ca (d) Al

2. Name any two bacterial sexually transmitted diseases. 

3. Write any one example of biotic and abiotic component of our ecosystem. 

4. Consider a geographical area containing organisms like snake, grasshopper, peacock, grass and frog. Pesticides are sprayed to kill insects in this area. Which organism will contain the maximum amount of pesticides and why? What is this phenomenon known as? 

5. (a) For what purpose is the “Khadin” technique used in Rajasthan?

(b) Mention at least two advantages of this technique. 

6. “Stars seem higher than they actually are” Explain, why? 

7. (a) What happens to the pollen when it is transferred on the stigma?

(b) What happens to ovary and ovule after fertilization? 

8. Draw all the possible isomers of pentane and name them. 

9. The elements of a period of the periodic table are given below in order from left to right with one of its element missing: 

Li      Be      B     C    O    F  Ne

(a) To which period do these elements belong?

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