- Figure 1 shows the features of a dry cell (Leclanche’s). Use the information in the figure to answer the questions a, b and c
b) Name the chemical substance in the parts labeled C and D. (2 marks)
c) Explain how local action is minimized in a dry cell.(1 mark)
2. Figure 2 shows a simple cell. use the information to answer questions a, b, c and d.
a) Name the part labeled A (1 mark)
b) Name the electrolyte B (1 mark)
c) It was observed that the bulb lights and after a short time it goes off. Explain why the bulb goes off.(5 marks)
d) Explain ways to minimize the causes of the bulb going off. (2 marks)
3. Give two reasons as to why bulbs are connected in series in domestic wiring (2 marks)
i. What name is given to the method of charging shown above? (1 marks)
ii. Complete the diagrams to show the final charge on the sphere. (3 marks)
iii. Explain the term earthing as used in electrostatics. (2 marks)
5. Two plane mirrors inclined at an angle 60 to each other. A ray of light makes an angle of 40 with mirror M1 and goes on to strike mirror M2. Find the angle of reflection on the second mirror M2. (3 marks)
6. The mixture used to make the pillar was obtained from cement, stones and sand. The ratio of volumes of cement to stone to sand was 1 : 2 : 3. Given that the densities of cement, stone and sand are 1800 kg/m3, 4200 kg/m3 and 3500 kg/m3 respectively. Work out the density of the mixture. (5 marks)
2. Figure 2 shows a simple cell. use the information to answer questions a, b, c and d.
b) Name the electrolyte B (1 mark)
c) It was observed that the bulb lights and after a short time it goes off. Explain why the bulb goes off.(5 marks)
d) Explain ways to minimize the causes of the bulb going off. (2 marks)
3. Give two reasons as to why bulbs are connected in series in domestic wiring (2 marks)
4. (a) State the basic law of electrostatics. (1 mark)
(b) The following diagram illustrates a method of charging a metal sphere.
(b) The following diagram illustrates a method of charging a metal sphere.
i. What name is given to the method of charging shown above? (1 marks)
ii. Complete the diagrams to show the final charge on the sphere. (3 marks)
iii. Explain the term earthing as used in electrostatics. (2 marks)
6. The mixture used to make the pillar was obtained from cement, stones and sand. The ratio of volumes of cement to stone to sand was 1 : 2 : 3. Given that the densities of cement, stone and sand are 1800 kg/m3, 4200 kg/m3 and 3500 kg/m3 respectively. Work out the density of the mixture. (5 marks)
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