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78SECTION A[28 marks]

Answerall questions

1. A student pours water into a cylinder and measures the height of the waterat different volumes. Diagram 1 shows the height of the water in thecylinder at different volumes.

Diagram 1

(a) Based on the experiment, state(i) the manipulated variable (1mark).

(ii) the responding variable (1mark)

.(ii) the fixed variable (1mark)

.(b) Based on the readings of the height of wate, H cm at different volumes, V m l,

record the readings in the table form. [5 marks]

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(c) Plot a graph H against V, based on the tabulated table.[5 marks]

(d) From the graph, state the relatinship between H and V. [1mark]

(e) Sate 2 precautionary measures which shoul be taken during the experiment.

[2marks]

2. Ali caries out an experiment to investigate the relationship between thepotential difference, V, across a filament bulb and the current, I flowing

through it. The results of the experiment is shown in the graph of V againstI as in Diagram 2 .(a) Determine the value of V when I = 0.2A. Show on the graph, how you

determine the value of V. [2 marks]

(b) Based on the graph, determine the range of the current that obeys theOhms Law. Show on graph how you determine the range of the current.[2marks]

(c) State how resistance varies with current. [2marks]

(d) The electric power, P used by the bulb is given by the formula P=I2m,where m is the gradient of the graph.

(i) Calculate the gradient, m when I = 0.2 A. Show on the graphhow you determine m. [4marks]

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(ii) Calculate the value of P when current I = 0.2A. [2marks]

(ii) State one precaution that should be taken to improve the resultsof this experiment. [1mark]

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Diagram 2

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SECTION B[12marks]

Answer any one question.

3. Diagram 3 shows a simple method to work out the approximate length (l1)of an underground telephone cable. The resistance (R1) of a pair of wiresin the cable is measured at one end while that pair of wires are shorted at

the other end. The reading is then compared to the resistance (R2)measurement carried out in the same manner on a similar cable whichlength (l2) is already known. The length of the cable is calculated by usingthe equation

l 1 = (R1/R2) x l 2

Diagram 3

(a) What inference can be drawn on the realtionship betweenresistance and length of the cable from the above method.[1mark]

(b) State suitable hypothesis that could investigated.[1mark]

(c) Plan an experiment you can do to test your hypothesis. Include thefollowings in your experiment.

(i) Aim of the experiment(ii) Variables in the experiment(iii) List of apparatus and materials(iv) A diagram showing the arrrangement of the apparatus(v) How you could manipulate the variables(vi) Tabulation of the data and(vii) Analysis of the data [10marks]

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4. The Diagram 4 (a) shows an empty lorry that takes 5 s to accelerate fromrest to reach a velocity of 30 ms-1. When the same lorry is loaded and thedriver presses the accelerator with the same amount of force, it takes 8 sto reach the same velocity. Using this information,

Diagram 4

(a) state one suitable inference that can be made(b) state one appropriate hypothesis that can be made(c) describe how you would design an experiment to test your hypothesis usingtrolleys and other apparatus.In your description, state clearly the following:

(j) Aim of the experiment(ii) Variables in the experiment(iii) List of apparatus and materials(iv) A diagram showing the arrrangement of the apparatus(v) How you could manipulate the variables(vi) Tabulation of the data and(vii) Analysis of the data [10marks]

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