. Relate refractive index with the speed of light in the medium, 1
Answer :

2. Name the elements other than carbon that constitute carbohydrates. 1
Answer :

3. What is Faraday constant? 1
Answer :

4. What are the units of rate of reaction? 1
Answer :

5. Give IUPAC name of H-C-H 1
Answer :

6. What are solar concentrators? Give the usual shape of such concentrators. 2
Answer :

7. If an object is at 10 cm from a convex lens of focal length 15 cm, find (i) position {ii) nature of image formed. 2
Answer :

8. Name two places of one country where fields of natural gas are found. Why is it called a clean fuel? Give two reasons. 2
Answer :

9. When two lenses of focal length 20 cm and - 30 cm are placed in contact. Find the equivalent. (i) Focal length (ii) Power 2
Answer :

10. Calculate the pH of the solution when hydrogen ion concentration is lxl0 -7 M. State whether the solution is acidic, basic or neutral.
OR
The pH of solution is 4. Calculate hydrogen ion concentration. State the solution is acidic, basic or neutral. 2
Answer :

11. A 60 W, 220 V bulb and a 40 W, 220 V bulb are used with a supply of 220 V in series. Find the (*) Net power consumed (it) Identify the brighter of the two bulbs.
OR
A 60 W, 220 V bulb and a 25 W, 220 V bulb are to be connected to a 220 V supply. How will you connect them to get (/) maximum potential in each, («) current through each bulb. 3
Answer :


12. Write chemical equations to show what happens when ;
(i) Concentrated HNO3 is poured over sulphur powder. {ii) Na2CO3.10H2O crystals are exposed to air {Hi) Manganese dioxide is heated with aluminium. 3
Answer :

13. Draw a labelled diagram of an A. C. generator. Write the basic principle underlining its functioning.3
Answer :

14. How does pyrcx glass differ from soda glass? Give composition of lead crystal glass. 3
Answer :

15. Explain the role of ciliary muscles, cornea and aqueous humour in helping the eye in its ability of accommodation. 3
Answer :
Section - B

16. Name the part of vascular bundle through which transport of Water and mineral
Answer :

17. What is endocrine gland ? 1
Answer :

18. Define vestigeal organs. Give examples. 1
Answer :

19. Give one example each of the following :
(a) Plant which reproduces naturally by vegetative propagation of leaf.
(b) Plant which reproduces naturally by vegetative propagation of stem. 2
Answer :

20. Define pollutants. Give one example each of (a) Primary pollutant, (b) Secondary pollutant. 2
Answer :

21. Explain the functions of plasma. 3
Answer :

22. List the various characteristics of hormones. 3
Answer :

23. Mention the various causes of soil erosion. 3
Answer :

24. What are the different salivary glands present in man? Mention their main functions. 3
Answer:

25. What is AIDS? Write the name of its causal organism, symptoms and prevention. 5
Answer:

Pages 1. Why two similar charges repel each other?
Answer

26. What is the principle of potentiometer?
Answer

27. What is the name given to A. B + A. B gate?
Answer

28. A wire of resistivity p is stretched so that its length becomes double and area half the original. How will the resistivity be affected?
Answer

29. A lens is taken and a small piece of it is removed from the centre as shown in figure (b). How the focal length of the lens is going to be effected in comparison with original lens A?
Image
Answer

30. Define resolving power of an instrument.
Answer

31. Define magnitude of a star.
Answer

32. Is dry cell really dry from inside? Explain in one, two lines.
Answer

33. What is electromagnetic damping? Where is it used?
Answer

34. If critical angle for a pair of medium is 30°, what is the angle of polarisation for the pair?
Answer

35. Distance of Venus is 0. 7 A.U. Find the orbital period of Venus in terms of earth days.
Answer

35. 1 atomic mass unit of substance is completely destroyed in a nuclear reaction, what is the energy produced in MeV?
Answer

36. Frequency of incident radiations on a metal surface is tripled, how will K.E. of ejected electrons be effected?
Answer

37. A 44 ohm resistor is used on 220 V supply for 2 hours. What are the expenses if 1 B.O.T. costs Rs.2-50?

38. A horizontal overhead power line carries a current of 5 A in west to east direction. What is the magnitude and direction of magnetic field due to current 2 - 5 m below the line ?
Answer

39. What is the difference between resistance, reactance and impedance ? Who arc they connected?
Answer

40. What is an optical fibre? Give one of its important applications.
Answer

41. What is depletion layer? Draw these in case of forward and reverse biasing P-N junction diode.
Answer

42. Find the minimum number of cells required to produce an electric current of 1 .5 A through a resistor of 30 ohm, given that the emfs of each cell is 1.5 V and internal resistance of each cell is 1 ?8222;?.
Answer

43. What are the laws of photoelectric emission? Explain these with the help of Einstein?8364;?s equation.
Answer

44. Distinguish between conductors, semiconductors and insulators on the basis of their energy bonds.
Answer

45. What are the laws of radioactive disintegration? Deduce the value of the number of atoms left after some time.
Answer

46. Find the magnitude and direction of the force between two parallel conducting wires carrying current and hence define an ampere.
Answer

47. What is solar constant? How does it help us to know the temperature of the sun?
Answer

48. What is neutral temperature and temperature of inversion and thermoelectric power? What is thermoelectric power at neutral temperature?
Answer

49. What is constringence? How is it related to refracting indices for different colours?
Answer

50. Two small spheres each of mass 0. 09 kg hang by equal silk threads attached to the same point. The spheres are charged and made to touch each other. They come to rest with their centres 0.02 m apart and 0.20 m vertically below the point of support. Find the charge on each sphere
if g = 9-8 ms-2.
Answer

51. What is Huygen principle? How SnelFs law can be deduced using this principle?
OR
Twelve wires each of resistance 4 ?8222;? are. Joined to form a skelton cube. Determine the resistance across any of the wire forming the cube.
Answer

52. Describe principle, construction and working of a D.C. generator. How can smooth output be got from it?
Answer

53. Deduce lens formula for convex len. Give sign conventions and assumptions followed. 1 2
Answer