i. The question paper comprises of two sections A an B. You are to attempt both the sections.
ii. All questions are compulsory.
iii. There is no overall choice. However internal choice has been provided in all the three questions of give marks category. Only one option in such questions is to be attempted.
iv. All questions of section A and all questions of Section B are to be attempted separately.
v. Q.No. 1-6 in section A and 17 to 19 in section B are very short answer type questions and carry one marks each.
vi. Q.No. 7-10 in section A and 20 to 24 in section B are short answer type questions and carry one marks each.
vii. Q.No. 11-14 in section A and 25 to 26 in section B are also short answer type questions and carry three marks each.
viii. Q.No. 15-16 in section A and 27 in section B are long answer type questions and carry five marks each.
1. A green layer is green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What could this green substance be?
2. Why should water by never added drop wise to concentrated sulphuric acid?
3. Name the product other water formed on burning of ethanol in air.
4. 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?
5. Draw the following diagram in your answer book and show that formation of image of the object AB with the help of suitable rays.
6. What is meant by the statement, “Potential difference between points A and B in an electric field is 1 volt”?
7. Name the gas evolved when dilute sulphuric acid acts as sodium carbonate. Write the chemical equation for the reaction involved.
8. What is the activity series of metals? Rearrange the following metals in an increasing order of reactivity: Aluminum, Zinc, Mercury.
9. An electric lamp is marked 40 W, 220 V. It is used for 4 hours daily. Calculate (i) its resistance while glowing (ii) energy consumed in kWh per day.
10.An object is placed at a distance of 12 cm in front of concave mirror. It forms a real image four times larger than the object. Calculate the distance of the image from the mirror.
11.What are redox reactions? Give one example. Name the substance that is oxidized and the one that is reduced.
12. a. Write the chemical name and formula of bleaching powder.
b. Why does bleaching powder smell of chlorine when exposed to air?
c. Write chemical equation to represented the action of dilute hydrochloric acid on bleaching powder.
13. Draw the pattern of field lines due to a bar magnet. Mention any two properties of the magnetic field lines.
14. a) State Ohm’s law.
b) Draw a schematic diagram of the circuit for studying Ohm’s law.
15.What are hydrocarbons? Discuss their types with suitable examples. Discuss the isomerism in alkanes, alkenes, and alkynes.
Explain the mechanism of the cleansing action of soaps and detergents.
16. State ‘Fleming’s right hand rule’. With a labeled diagram describe the working of an A.C. electric generator.
What is long-sightedness? List to causes for development of long-sightedness? Describe with the ray diagram, ho this defect may be corrected by using spectacles.
20. Explain ‘reflex action’ with a suitable example.
21.What is meant by analogous organs? How is different from analogous organs.
22.Point out the differences between an artery and vein.
23.Define ‘nuclear fusion reaction’. Describe the conditions for the occurrence of a nuclear fusion reaction.
24.What is the principle of working of solar cooker? Write the major drawbacks of all solar heating devices.
25.What are the measures adopted to conserve biodiversity.
26.What are the male and female gonads in human beings? State any two functions of each of them.
27.What is endocrine system? What are its functions? Name the important endocrine glands present in human body. Draw a labeled diagram to show the positions of these endocrine glands in human body (Male/ female)
Draw a diagram of the ‘human alimentary canal’. Label the following body parts on it.
iii. Gall bladder