KCSE Past Papers 2020 Physics Paper 3 (232/3)

Proceed as follows:

Using the micrometer screw gauge, measure and record the diameter d of the wire.

d=........mm

d=.........m (1 mark)

Set up the apparatus as shown in Figure 1.

Using the voltmeter, measure the potential difference E across the battery before closing the switch.

E = ........volts. (1 mark)

Adjust the length L of the wire to 0.1m (10cm). Close the switch, read and record the value of the current I in Table 1.

Repeat (d) for the other values of L given in Table 1. Complete the table. (6 marks)

On the grid provided; plot the graph of 1/I (y axis) against L. (5 marks)

From the graph, determine the:

(i) Gradient S; (3 marks)

(ii) Intercept C on the 1/I axis. (1 mark)

h. Given that:

(i) 4K₁/πd²E = S determine the value of K₁

(ii) K₁/E = C determine the value of K₂

Question 2

You are provided with the following:

Proceed as follows PART A

(a) Clamp the bulb holder onto the stand. Arrange the bulb, the lens and the screen along the metre rule as shown in Figure 2.

(b) Adjust the distance of the bulb from the lens to U = 25 cm. Put on the switch and adjust the position of the screen from the lens so that a sharp image of the bulb is observed.

Record the distance V between the screen and the lens in Table 2.

(c) Repeat part (b) for the other values of U shown in Table 2. Complete the table. (7 marks)

(d) Determine the average value of F.(2 Marks)

PART B (e) Using the vernier callipers measure and record the diameters of the three pipes.

d_A, d_B and d_C

d_A= ..........Cm.................. m

d_B= ..........Cm.................. m

d_C= ..........Cm.................. m

(f) Measure and record the thickness X of the half metre rule.

X= ....................CM.................. m

(g) Place the pipe marked A on the bench and use the plasticine to stop it from rolling. (see Figure 3 (a)

(j)  Repeat the procedure in (g), (h) and (i) for the other‘ pipes B and C. Complete Table 3.(5 marks)

(k) Determine the average value of Z (2 marks)

Practical Answers

2020 Physics paper 3

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