Monday, November 19, 2007


रवि मोहन

Science (Theory)
Time – 2.30 Max.Marks - 60
General Instructions :-
The question paper comprises of two sections A and B. You are to attempt both the sections.
All questions are compulsory.
There is no overall choice. However internal choice has been provided in the some questions. You are the attempt only one options in such questions .
You are advised to attempt all the question of section A and section B separately.
Questions number 1-6 in section A and 17-19 in section B are very short answer questions and carry one marks each
Question number 7-10 in section A and 20-24 in section B are short answer questions and carry two marks each.
Question number 11-14 in section A and 25-26 in section B are short answer questions and carry three marks each.
Question number 15 and 16 in section A and 27 in section B are short answer questions and carry five marks each.

1. If the magnification of a body of size 1m is 2. What is the size of the image?
2. What do you mean by “rancidity”?
3. what is double the amount of gas v collected in one of the test tubes on electrolysis of water ? Name this gas. 4. Name the most metallic and most non- metallic element in the periodic table.
5. Name an acid base indicator prepared at home. 6. What is meant by the statement that “potential difference between points A & B in an electric field is 1 Volt”?
7. How many 176 resistors (in parallel) are required to carry 5A in 220 V line?
8. Why should curd and sour substance not be kept in brass and copper vessels?
9. Two electric lamps of 100 W and 25W respectively are joined in parallel to supply of 200 V calculate the total current flowing through the circuit .
10. What happens when aluminium metal reacts with sodium hydroxide? Give the equation for the chemical reaction?
11. Describe with the help of a labeled diagram the method of refining of metals by electrolytic method taking copper as an example.
12. Here are given some elements belonging to a specific group and period in the periodic table
Li Be B C N O F Na Mg Al Si P S Cl
Give answer:
(i) Which is more reactive between F & Cl?
(ii) The most metallic and the most non-metallic element.
(iii) Element of smallest atomic size and the element of largest atomic size? 13. A concave mirror of focal length 15 cm. forms and image of an object kept at a distance of 10 cm. from the mirror . Find the position, natural and size of image formed by it.
14. Give three advantages of nuclear fusion process over nuclear fission to generate electricity.
15. What is ohm’s law? Light an experiment to verify ohm’s law.
What is solenoid? Draw the magnetic field lines due to a current carrying solenoid. Write some properties of magnetic field lines…
16. Explain the following terms with suitable examples:
(a) Oxidation (b)Reduction (c) Oxidizing agent (d) Reducing agent (e) chemical equation
Define pH. Explain the role of pH in every day life.


17. Give an example of a vestigial organ present in human.
18. What is a food chain?
19. Where does fertilization takes place in the human beings?
20. What is the roll of decomposers in an ecosystem?
21. What are fossils? what do they tell us about the process of evolution ?
22. Write the cause of depletion of ozone layer in the atmosphere.
23. How does intestinal juice contribute to the digestion of proteins?
24. Describe double fertilization in plant.
25. Draw a well labeled diagram of the longitudinal section of a flower and briefly write about its sexual whorls .
26. Define reflex action with suitable examples.
27. (a) Name the blood groups under ABO system.
(b) Differentiate between universal donor and universal recipient under this system.
Explain the human digestive system with the help of a diagram.