A child while playing with his father’s spectacles burnt a hole in a piece of them tissue paper by focusing the image of the Sun on at.

(a) Name the defect of vision his father is suffering form.

(b) List two causes of the defect.

(c) Draw a ray diagram to show how this defect may be corrected using a suitable lens.

List in tabular form, two distinguishing features between the acquired traits and the inherited traits with one example of each.

A student has to project a three times magnified image of a candle flame on a wall. Name the type of the lens (converging/ diverging) required for the purpose. If the candle flame is at a distance of 6 m from the wall, find the focal length of the lens.

Some residents of your colony are planning to cut trees to create a place for parking vehicles. You are upset by knowing all this and wanted to do something to create awareness about the importance of trees.

(a) List any three reasons that you will use to convince residents of your colony not to cut the existing trees.

(b) List any three values that would be inculcated amongst them with such approach.

(a) State two main reasons for carbon forming a very large number of compounds.

(b) Give a reason why carbon forms compound

(i) Namely by Covalent bonding

(ii) Having low melting and boiling points

(c) What happens when (Write chemical equations of the reactions)

(i) A piece of sodium metal is added to ethanol.

(ii) Ethanoic acid reacts with sodium hydroxide.