» CBSE Science Practice Paper : Set II : CBSE Sample Question Papers

Section - A

1. Name the largest component of biogas, 1
Answer :

2. Why do we use convex mirror for rear-view mirrors in automobiles ? 1
Answer :

3. Name the major metal used for making bodies of aircraft. 1
Answer :

4. What is a fuse wire ? Name its constituent materials. 1
Answer :

5. Give two characters of energy sources. 1
Answer :

6. Name the model that was proposed to explore fission and give one example of fission reaction. 2
Answer :

7. Draw a labelled diagram of apparatus for getting wood gas from wood in the laboratory. What name is given to the solid residue obtained? 2
Answer :

8. Explain how does concentration affect the rate of reaction ?

OR
State two important properties of washing soda. 2
Answer :

9. If a 40 W bulb and a 100 W bulb are operated for 4 hours per day in a month of 30 days. Find the energy consumed at 200 volts of supply potential ? 2
Answer :

10. Write IUPAC name of the following ;
(i) CH₃COCH₃, (ii) CH₃COOC2H5. 2
Answer :

11. Point out three differences between nuclear reactions and chemical reactions. 3
Answer :

12. An organic compound ‘X1 is an essential constituent of wine and beer. X is responsible for the intoxication caused by these drinks. Oxidation of ‘X’ yields an organic acid and ‘Y’ is present in vinegar. Name the compounds X and Y and write their structural formula. 3
Answer :

13. What does the Big Bang theory say about the origin of universe ? 3
Answer :

14. Determine the pH of the acidic solution formed when 0.02 mol of HC1 is added to enough water to make the final volume 2.0 L.

OR
The pH of a solution changes from 5 to 4. How many times do you expect a change in hydrogen ion concentration. 3
Answer :

15. Draw a neat diagram of an astronomical telescope and write the nature of image formed. Write the relation for magnification and the length of telescope under normal adjustment. 3
Answer :