# Physics Paper 3 Questions and Confidential - Bondo Joint Mocks Exams 2022

## Questions

Instructions to the candidate:

• Answer all questions in the spaces provided
• You are supposed to spend the first 15 minutes of the 2 ½ hours allowed for this paper reading the whole paper carefully before commencing your work.
• Marks are given for a clear record of the observations actually made, their suitability, accuracy and the used made of them.
• Candidates are advised to record their observations as soon as they are made.
• Non- programmable silent electronic calculator and KNEC Mathematical tables and electronic calculators may be used except where stated otherwise.
h) This paper consists of 7 printed pages. Candidates should check to ensure that all pages are printed
as indicated and no question(s) is missing.

QUESTION 1

• Voltmeter
• Ammeter
• Resistor labelled R
• A nichrome wire labelled W mounted on a milliameter scale
• A nichrome wire labelled S mounted on a millimetre scale
• Two dry cell size
• A cell holder
• One jockey
• One centre zero galvanometer
• Eight connecting wires, 4 with crocodile clips at both ends
• A switch

Proceed as follows:

1. Connect the apparatus as shown in the figure 1 below (for wire W with length L = 100cm)

1. Record the voltmeter reading when the switch S is open
V1 =________________ V (1 mark)
2. Close the switch and record the reading of the voltmeter, V, and ammeter I
I____________________A (1 mark)
V2 ___________________V (1 mark)
3. Determine the constant k using the formula 2k = (2 marks)
2. Set up the apparatus as shown in the circuit in figure 2.

Use the crocodile clips to fix L, of wire labelled S at 50cm from the end connected to the galvanometer G.
3. Then close the switch and use the jockey to touch one end of the wire W, and then the other end. The deflections on the galvanometer should deflect in the opposite directions, if not check the circuit connections.
Adjust the position of the jockey along the wire W until there is no deflection in the galvanometer.
Record the value of x and y
x = ......................................................... cm
y = .......................................................... cm (1 mark)
4. Repeat for other values of L in table 1 below. (6 marks)
Table 1
 L (cm) 45 40 35 30 25 20 x (cm) y (cm) y/x
5.
1. Plot a graph y (y-axis) against L. (4 marks)
2. Determine the slope, m of the graph. (2 marks)
3. Given that =, determine t r. (2 marks)

QUESTION 2

• 250ml glass beaker
• Liquid L
• Water
• Measuring cylinder
• Metre rule
• Candle
• Piece of Tissue paper
• Thermometer
• Stopwatch
• Boiling tube
• White screen

Proceed as follows

1.
1. Measure 200cm3 of water and place in a 250ml glass beaker .Set up the apparatus as shown in figure 3
Figure 3
2. Starting with distance p= 30cm, Adjust the screen until a sharp vertical line of light is observed on the screen. Measure and record the distance q in the table 2
3. For the other values of distance p shown in the table 2 below, repeat the procedure a (ii) to complete the table.

Table 2 (4 marks)
 Distance p cm 30 25 20 15 Distance q cm
4. Determine the average value of f. (1 mark)
2.
1. Measure 200cm3 of liquid L and place in a 250ml glass beaker
2. Measure the height h of liquid L in the beaker
h = _____________________________cm (1 mark)
3. Determine z using the formula z = (1 mark)
4. Set up the apparatus as shown in figure 3. Repeat procedure a (ii) and (iii) for distance p in table 3 and record new distances q 1 to complete the table 3 (4 marks)
 Distance p cm 30 25 20 15 Distance q1 cm
5. Determine the average value of (1 mark)
3. Determine β given that β= (1 mark)
4. Given that n = determine the constant n ( 1 mark)
5.
1. Measure 30cm 3 of liquid L and place in the boiling tube. Place thermometer into the liquid .Heat the boiling tube and its content in a hot water until its temperature is 75 0 C.Remove the boiling tube from hot water and allow liquid L to cool. Immediately at 70 0 C, start your stop watch and record the time t1 it takes to cool to 60 0 C.
t1 ……………....................................... seconds (1 mark)
2. Determine the rate of cooling R at temperature intervals given that R = (2 marks) ( 2.1J/g/K )
6.
1. Measure 30cm 3 of water and place in the boiling tube. Place the thermometer into the water and heat the boiling tube and its content in a hot water until its temperature is 75°C.Remove the boiling tube from hot water and allow it to cool. Immediately at 70°C , start your stop watch and record the time t 2 it takes to cool to 60°C.
t 2 ……………....................................... seconds (1 mark)
2. Given that t2R= determine the constant µ (2 marks) (1g/cm3 )

## Confidential

Question 1

• Voltmeter (0-5V)
• Ammeter (0-1A)
• one carbon resistor labelled R ( R=10 Ohms)
• A nichrome wire SWG 28 ( diameter =0.32mm) mounted on a millimetre scale-100cm labelled W
• A nichrome wire SWG 32 (diameter=0.24mm) mounted on a millimetre scale 50cm, labelled S
• Two dry cell size D (1.5V)
• A cell holder
• One jockey
• One centre zero galvanometer
• Eight connecting wires, 4 with crocodile clips at both ends
• A switch

Question 2

• One 250ml glass beaker
• About 250ml paraffin labelled Liquid L in beaker
• About 250ml of distilled water in a beaker labelled water
• 100ml or 250ml measuring cylinder
• Metre rule
• Candle
• Piece of Tissue paper
• Thermometer
• Stopwatch
• One Boiling tube

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