Question

24.The image of an object formed by a convex lens is real, inverted and of the same size as
the object at a distance of 40 cm from lens. Find the object distance and power of lens.
25. Calculate the number of electrons constituting one coulomb of charge.
26. What is geothermal energy?
Answer the following questions (each carries 3 mark)
27. What does one mean by exothermic and endothermic reactions? Give examples.
28.Explain with the experiment that metals are good conductors of heat
29. Explain breaking down of glucose molecule.
30.Draw labelled diagram: Longitudinal section of a flower.
31.If a women is using copper-T, will it help in protecting her from sexually transmitted
diseases?
32. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10
cm. Draw the ray diagram and find the position, size and nature of image formed.
33.A hot plate of an electric oven connected to a 220 V line has two resistance coils A and
B, each of 24 A resistance, which may be used separately, in series or in parallel. What
are the currents in the three cases?
34. Give the advantages of solar cell panel.
• Answer the following questions. (each carries 4 mark)
35. Explain oxidation of copper in copper (II) oxide.
36.Explain chlor alkali method for production of sodium hydroxide and give usefulness of
products.
37. Explain human respiratory system with a diagram.
38.Explain female reproductive system by drawing a diagram.
39. What happens when metals react with water? Explain with example.​

Answer 1

sorry but I really don't know the answer!

Explanation:

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