PHYSICS
PAPER 3
PRACTICAL
INSTRUCTIONS TO CANDIDATES
 Answer all questions in the spaces provided.
 You are supposed to spend the first 15 minutes of the 2½ hours allowed for this paper reading the whole paper carefully before commencing your work.
 Marks will be given for clear records of observations actually made, their suitability, accuracy and the use made of them.
 Candidates are advised to record their observations as soon as they are made.
 All working must be clearly shown where necessary.
 Mathematical tables and silent electronic calculators may be used.
 This paper consists of 8 printed pages. Candidates are advised to check that all pages are printed as indicated and no questions are missing.
Questions
QUESTION ONE
This question has two parts A and B. Answer all the parts
PART A
You are provided with the following:
 A metre rule
 Two identical 100g masses (labelled A and B)
 Liquid L in 250ml beaker, full.
 Three pieces of thread, each 30cm long.
 Stand with clamps
 Tissue paper.
 Vernier calipers
Proceed as follows: Take one 100g mass and measure the diameter d and height h using the Vernier calipers
d=………………………………..m
h=………………………………..m (1mark)  Determine the volume V given that 2h
V…………………………………………m3 (1mark)  Using a stand and one piece of thread, suspend the metre rule in air such that it balances horizontally. Record the position of the centre of gravity. G.
G = ___________________________________________ cm (1mark)
NOTE: The metre rule should remain suspended at this point throughout the experiment.  Set up the apparatus as shown in Figure 1 below;
 Suspend the mass A at a distance x = 30cm and completely immerse it in liquid L without touching the sides of the beaker.
 Hang mass B and adjust its position such that the rule is balanced and measure the distance d cm. Tabulate your results in table 1 below;
x(cm) 30 35 40 d(cm) d/x
 Determine the weight F of one of the masses A or B in air. Given that
g= 10N/Kg and A =B (2marks)
Weight F in air =…………………………………… (1mark)  Using the principle of moments, determine the apparent weight P of A when completely immersed in liquid L.
Apparent weight P = …………………….. (2marks)  Find the upthrust U on A when completely immersed. (1marks)
Upthrust; U =……………….  Determine the density of liquid L, given that; (1mark)
ρ= Un/v where n= 0.1Kg/N
 Take one 100g mass and measure the diameter d and height h using the Vernier calipers
PART B
You are provided with the following apparatus:
 Resistance wire fitted on a millimeter scale labeled MN
 Switch
 Voltmeter
 Ammeter
 Two dry cells in a cell holder
 Six connecting wires
 Micrometer screw gauge
 Set –up the apparatus as shown in the Figure 2 below;
 Remove the crocodile clip from the resistance wire MN and close the switch. Record the voltmeter reading V_{0}.
V_{0} = …………………………………. (1mark)  Attach the Jockey to the resistance wire such that l = 50cm
 Record the voltmeter and ammeter readings as V1 and Z respectively
V1 =…………………………………....... (1mark)
Z =……………………………………… (1mark)  Determine the value of X given that X= ^{v1}/_{z}(1mark)
 Use the equation below to determine the value of k , where m = 2.549Ω (2marks)
V1 = mx + k
V_{0}  V_{1} 5  Measure the diameter d of the of the wire on the millimeter scale using the micrometer screw gauge
d = …………………………mm =……………………………….m (2marks)  Determine the resistivity ꝭ of the wire used in this experiment given that (2marks)
X= ^{ꝭl}/_{A}
 Set –up the apparatus as shown in the Figure 2 below;
QUESTION TWO
You are provided with the following apparatus
 A glass prism
 A plain sheet of paper
 A soft board
 4 optical pins
 4 paper pins
Proceed as follows
 Firmly fix the plain sheet of paper on the soft board using the thumb pins and place the prism near the centre of the paper. Trace the outline of the prism using a pencil.
 Remove the prism from the outline and label the vertices of the outline AB and C as shown in Fig. 3a
Measure Angle LMN and length Ɩ
Angle LMN…………………………… (1mark)
Length Ɩ ………………………………… (1mark)  On the side ML mark a point and draw a normal. Measure an angle T of 60° from the surface and draw a line along this angle as show in Figure 3b
 Replace the prism on the outline and fix pins P1 and P2 on the 60° line at a distance of 3cm from each other. View the images of the pins P1 and P2 through side MN and fix P3 and P4 so that all the pins appear on one line.
 Remove the prism and draw a line to pass through the holes made by pins P3 and P4.extend the line into the outline as shown in figure 3b.Also extend the 60° line so that the two lines cross each other. Determine angle D and record it in the table below
 Repeat the procedure and complete the table below (6marks)
Angle T(º) 60º 50º 40º 30º 20º Angle D(º) Angle Iº(90ºT)  Determine the average value Dm of D (1mark)
 On the grid provided plot a graph of Angle D (yaxis) against Angle I (5marks)
 Use your graph to determine the lowest value Hmin of angle D
H_{min}…………………………………. (1mark)  Determine the value of I° when D° is 41° (2mark)
 Determine the constant K for the glass prism from the formula (3marks)

Confidential
Each candidate should have the following:
 A metre rule
 Two identical 100g masses (labelled A and B)
 Liquid L , paraffin in 250ml beaker, full.
 Three pieces of thread, each 30cm long.
 Stand with clamps
 Tissue paper.
 Vernier calipers (To be shared)
 Resistance wire fitted on a millimeter scale labeled MN,( Nichrome wire G=32mm)
 Switch
 Voltmeter (05V)
 Ammeter (02.5A)
 Two dry cells in a cell holder
 8 connecting wires ,atleast 4 with crocodile clips
 Micrometer screw gauge (To be shared)
 A glass prism
 A plain sheet of paper
 A soft board
 4 optical pins
 4 paper pins
Marking Scheme
QUESTION ONE
This question has two parts A and B. Answer all the parts
PART A
You are provided with the following:
 A metre rule
 Two identical 100g masses (labelled A and B)
 Liquid L in 250ml beaker, full.
 Three pieces of thread, each 30cm long.
 Stand with clamps
 Tissue paper.
 Vernier calipers
Proceed as follows: Take one 100g mass and measure the diameter d and height h using the Vernier calipers
d=0.0m
h=0.0m (1mark)  Determine the volume V given that 2h
V  Exact or 4s.f m3 (1mark)  Using a stand and one piece of thread, suspend the metre rule in air such that it balances horizontally. Record the position of the centre of gravity. G.
50.0 ± 1
NOTE: The metre rule should remain suspended at this point throughout the experiment.  Set up the apparatus as shown in Figure 1 below;
 Suspend the mass A at a distance x = 30cm and completely immerse it in liquid L without touching the sides of the beaker.
 Hang mass B and adjust its position such that the rule is balanced and measure the distance d cm. Tabulate your results in table 1 below;
x(cm) 30 35 40 d(cm) 26.0 31.0 35.0 d/x
 Determine the weight F of one of the masses A or B in air. Given that
g= 10N/Kg and A =B (2marks)
Weight F in air = 1N
(ignore unit but penalize fully for wrong unit)  Using the principle of moments, determine the apparent weight P of A when completely immersed in liquid L.
1 x d = W x corresponding value of x
1 x 26 = w x 30
Apparent weight P = 0.8667  Find the upthrust U on A when completely immersed. (1marks)
Upthrust; U = Answer @ e  Determine the density of liquid L, given that; (1mark)
ρ= Un/v where n= 0.1Kg/N
Answer @ g x 0.1
Answer @ b
=Exact or 4 s.f
 Take one 100g mass and measure the diameter d and height h using the Vernier calipers
PART B
You are provided with the following apparatus:
 Resistance wire fitted on a millimeter scale labeled MN
 Switch
 Voltmeter
 Ammeter
 Two dry cells in a cell holder
 Six connecting wires
 Micrometer screw gauge
 Set –up the apparatus as shown in the Figure 2 below;
 Remove the crocodile clip from the resistance wire MN and close the switch. Record the voltmeter reading V_{0}.
V_{0} = 3.00 ± 0.20 1 d.p  Attach the Jockey to the resistance wire such that l = 50cm
 Record the voltmeter and ammeter readings as V1 and Z respectively
V1 = 2.70 ± 0.20 1 dp
Z = 0.17 ± 0.05 2 dp  Determine the value of X given that X= ^{v1}/_{z}(1mark)
Correct substitution
Evaluation  ignore unit , penalize fully if wrong  Use the equation below to determine the value of k , where m = 2.549Ω (2marks)
V1 = mx + k
V_{0}  V_{1} 5
Correct substitution
Evaluation  Measure the diameter d of the of the wire on the millimeter scale using the micrometer screw gauge
d = 0.31 ± 0.03
mm = 5dp or 1d.p in std form  Determine the resistivity ꝭ of the wire used in this experiment given that (2marks)
X= ^{ꝭl}/_{A}Correct substitution
_{}
 Set –up the apparatus as shown in the Figure 2 below;
QUESTION TWO
You are provided with the following apparatus
 A glass prism
 A plain sheet of paper
 A soft board
 4 optical pins
 4 paper pins
Proceed as follows
 Firmly fix the plain sheet of paper on the soft board using the thumb pins and place the prism near the centre of the paper. Trace the outline of the prism using a pencil.
 Remove the prism from the outline and label the vertices of the outline AB and C as shown in Fig. 3a
Measure Angle LMN and length Ɩ
Angle LMN 60º ± 1
Length Ɩ 3.8 ± 0.2 1d.p (cm)  On the side ML mark a point and draw a normal. Measure an angle T of 60° from the surface and draw a line along this angle as show in Figure 3b
 Replace the prism on the outline and fix pins P1 and P2 on the 60° line at a distance of 3cm from each other. View the images of the pins P1 and P2 through side MN and fix P3 and P4 so that all the pins appear on one line.
 Remove the prism and draw a line to pass through the holes made by pins P3 and P4.extend the line into the outline as shown in figure 3b.Also extend the 60° line so that the two lines cross each other. Determine angle D and record it in the table below
 Repeat the procedure and complete the table below (6marks)
Angle T(º) 60º 50º 40º 30º 20º Angle D(º) 47 40 39 41 44 Angle Iº(90ºT)
Exact subtraction (all correct)  Determine the average value Dm of D (1mark)
Value of D at 60º + Value of D at 50º + .....+ Value of D at 20º
5  On the grid provided plot a graph of Angle D (yaxis) against Angle I (5marks)
 Use your graph to determine the lowest value Hmin of angle D
H_{min } Indicated or shown on graph even if the min graph has not scored the marks for line  Determine the value of I° when D° is 41° (2mark)
As above for (e)  Determine the constant K for the glass prism from the formula (3marks)
Ignore units but penalise fully wrong units at accuracy mark
Correct substitution
Evaluation
Accuracy ( 1.5 ± 0.1)
3 points required to qualify a mark for curve, with allowance of 1 small square.

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