SECTION - A
Q. 1. Give an example of an endothermic reaction. (1)
Q. 2. What kind of lens is used in the spectacles of a person suffering from myopia (near-sightedness)? (1)
Q. 3. Name a metal which is both ductile as well as malleable. (1)
Q. 4. There are two electric bulbs,
Q. 5. What is meant by the term “magnetic field lines”? List two properties of magnetic field lines. (2)
With the help of a neat diagram describe how you can generate induced current in a circuit.
Q. 6. Write two observations you would make when quick lime is added to water. (2)
Q. 7. Choose a metal out of the following which reacts with hot water but not with cold water:
Sodium, Magnesium, Iron
Mention the products formed during the reaction. (2)
Q. 8. Out of the two, equatorial and polar orbits of man-made satellites, which one is suitable for collection of data for weather prediction? Why? (2)
Q. 10. In a household 5 tubelights of 40 W each are used for 5 hours and an electric press of 500 W for 4 hours every day. Calculate the total electrical energy consumed by the tubelights and press in a month of 30 days. (3)
Q. 11. What is an alloy? Name the constituents of 22- carat gold. Why is 24-carat gold converted to 22-carat gold ?
Draw a labelled diagram to show the extraction of sulphur by Frasch process.
Q. 14. What are Jovian planets? Why are they so called? Write any two special features of Jovian planets. (3)
Give reasons for the following;
Q. 17. What is a gene? (1)
Q. 18. What is vegetative propagation? (1)
Q. 19. Mention two harmful effects of each of the following pollutants that are emitted from motor vehicles:
Define eutrophication. State its two harmful effects.
Q. 20. What is sustainable ‘development? Suggest any one method to achieve it. (2)
Q. 21. What is pollination? Name its two types. How do they differ from each other? (3)
Q. 22. Draw a diagram of human alimentary canal showing duodenum, small intestine, liver and pancreas. (3)
State the role of the following in the human respiratory system:
Q. 23. What is blood transfusion? What could be the consequence if proper matching of blood is not done during transfusion? Give the reason of such a consequence. (3)