SECTION A
Q. 1. A ray of light is incident on a convex mirror as shown on.
Redraw the diagram after completing the path of the light ray after reflection from the mirror. (1)
Q. 2. How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire increases? (1)
Q. 3. Name the product other than water formed on burning of ethanol in air.( 1)
Q. 4. Why does magnesium powder react much more rapidly than magnesium ribbon with dilute sulphuric acid? (1)
Q. 5. Name the type of nuclear reaction by which the Sun produces its energy. List two conditions which are present at the center of the sunresponsible for this reaction.
Q. 6. Given below are the pH values of four different liquids:
7.0, 14.0, 4.0, 2.0
Which of these could be that of:
Q. 7. An object is placed at a distance of 12cm in front of a concave mirror. It forms a real image four times larger than the object. Calculate the distance of the image from the mirror. (2)
Q. 8.
Or
A bulb is rated at 5.0 volt, 100 mA. Calculate its
Q. 9.
Or
Complete the following reaction equations:
Q. 10.
Q. 11.
Q. 12.
Or
Explain the following terms by giving one example of each: (3 )
Q. 13. What is a nuclear reactor? State one function each of
Q. 14. Distinguish between natural and artificial satellites.
To launch an artificial satellite in an orbit around the Earth what is the minimum:
Q. 15.
Q. 16. What is an alloy? How is an alloy made? List two purposes of making alloys. Mention the constituents and two properties of each of the following alloys: (5)
SECTION - B
Q. 17. Write the expanded form of AIDS. (1)
Q. 18. Name the type of fission carried out by Amoeba. (1)
Q. 19. “Rapid increase of population disturbs the biotic environment” Justify this statement taking any two aspects. (2)
Q. 20. Differentiate between tropic and nastic movements in plants. Give one example of each. (2)
Q. 21. Write the functions of the following in the digestive process: (3)
Q. 22. Give reasons for the following: (3)
Q. 23. Who proposed the “Theory of Natural Selection”? Explain this theory briefly. (3)
Q. 24.
Or