KCSE Past Papers 2019 Physics paper 3 (232/3)

Proceed as follows:

(a) Set up the circuit as shown in figure 1.

I =..........................

V =............................

Open the switch.

Determine the resistance R of component X given that: R = V/I

(b) Pour hot water into the beaker and set up the apparatus as in figure 2, so that component X afid the llieriiioirieter bulb are fully immersed.

(d) Repeat (c) as the temperature falls to the oÎher values shown in table 1. Complete the table. Table 1 (8 marks)

(ii) Given that R and T are related by the equation Log R = Log K + n Log T (4 marks)

(i) n................................(1 marks)

(ii) k................................(2 marks)

Question 2

You are provided with the following:

Proceed as follows:

PART A

(a) Using a string, suspend the metre rule on the stand so that it balances horizontally at its center of gravity.

Record the centimetre mark at which the metre rule balances.

Centimetre mark =......................cm (1 mark)

(b) With the metre rule balanced at its centre of gravity, suspend a 20 g mass at a distance of 30 cm from the centre of gravity.

Suspend the 50 g mass on the other side of the centre of gravity and adjust its position until the rule is balanced. See figure 3.

d = ............................

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

Record the volume of the water in the measuring cylinder provided.

V=.....................................(1 mark)

(ii) Immerse the 20 g mass fully into the water and adjust the position of the 50 g mass so that the rule balances horizontally.

Record the volume V₁ of the water plus 20 g mass and the distance d₁ of the 50 g mass from the centre of gravity.

(iii) (I) Determine the volume of the water displaced (1 mark)

(II) Determine the weight of the water displaced. (density of water — I gcm(^-3) (3 marks)

(d) (i) Use the principle of moments to determine the apparent weight of the 20 g mass when fully immersed in water. g — 10 Nkg^-1 (2 marks)

(ii) Calculate the weight of the 20 g mass in air (g = 10 Nkg^-1)

(iii) Determine the apparent loss in weight of the 20 g mass. (l mark)

PART B

(e) Light the candle and place it at distance u = 20 cm in front of the concave mirror. Adjust the position of the screen until a sharp image of the candle flame is obtained. See figure 4.

v=....................................(1 mark)

(ii) Determine:

I. The magnification m of the mirror given that: m = v/u (1 mark)

II. the value f₁ given that: f₁ = mu/m+1

(f) Repeat part (e) for distance u₁ = 18 cm.

(i) Read and record the distance v₁ between the screen and the mirror. (ii) Determine the magnification m₁ of the mirror. (1 mark )

(iii) Hence determine f₂.

(g) Determine the average value of f. ₁

Practical Answers

2019 Physics paper 3

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