Form 2 ScienceChapter 15. Diagram 5.1 shows the formation of image in the eye of a person with a vision defect.Diagram 5.1

(a) (i) Name the vision defect shown in Diagram 5.1.

[1 mark](ii) Give one reason for this vision defect.

[1 mark]

(iii) How do you overcome this defect of vision?

..

[1 mark] (iv) Draw the correction of this vision defect as suggested in (a)(iii) on Diagram 5.2.

Diagram 5.2

[2 marks]

(b) (i) Name the vision defect which is common among elderly people.

[1 mark] (ii) Give one reason for your answer in (b)(i).

1. Diagram 2 shows an activity conducted to determine the freezing point and the boiling point of water.Diagram 2

(a) Why is salt added to the ice cubes in A?

[1 mark](b)What is the function of the glass tube in B?

[1 mark](c)State the temperature of water in A when it begins to freeze.

[1 mark] (d)State the temperature of water in B when it begins to boil.

[1 mark](e)What is the change in the state of matter when water

(i) freezes:.

(ii) boils: [2 marks]

(f)What happens to the motion of water molecules when water

(i) freezes:

(ii) boils:.2. Diagram 3 shows an experiment to study the effect of humidity on evaporation. Diagram 3

(a) State the variables in the experiment.

(i) Manipulated variable: ..

(ii) Responding variable: .

(iii) Constant variable: [3 marks]

(b) What is the function of the anhydrous calcium chloride?

[1 mark] (c)Name another chemical substance that can be used to replace the anhydrous calcium chloride. ..[1 mark]

(d)Why is the beaker containing water placed in the bell jar P?

[1 mark] (e)What would be observed in bell jar P and bell jar Q after one hour? Why?

[2 marks](f) State two other factors that influence the rate of evaporation.

(i) ....

(ii) ..

1. Diagram 1 shows part of the human digestive system.

P: .XDiagram 1Q: .R: .

(a) Label structures P, Q and R using the following words.

Pancreas

LiverOesophagus

[3 marks]

(b) (i) Name the enzyme that is found in X.

.............................[1 mark] (ii) State the function of the enzyme in b(i).

.[1 mark]

(c) State the function of R.

[1 mark](d)Name the process by which food is moved along P.

[1 mark]

63JPN Pahang 2009