PRESIDENT'S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
FORM FOUR PRACTICAL EXAMINATION
PHYSICS
( PRACTICAL 2A)
CODE: 031/2A
TIME : 2 ½ HOURS. MAY 2023
INSTRUCTION:
π= 3.14
Acceleration due to gravity, g = 10m/s^{2}
1. You are provided with iron metal ball, extensible string of 2m long, stop watch, retort stand, clamp and cork pads. Set up the apparatus as shown in the figure 1.
Proceed as follows
Length L(cm)  140  120  100  80  60  40 
Time for 10 oscillations (s) 






Period time T(s) 
 




T^{2}(s^{2}) 






Questions
2. The aim of this experiment is to determine the E.m.f and internal resistance of the cell. You are provided with 2 dry cells an ammeter (0 — 3) A, a resistance box, a switch and connecting wires
Procedure.
a. Connect the wire as shown in figure 2. Below, Put R = ln and quickly read the value of Ion the ammeter.
b. Repeat the procedure s in (a) above for the value of R = 2Ω, 3Ω, 4Ω and 5Ω respectively.
c. Tabulate your results in a suitable table include the value of ^{1}/L
d. Plot the graph of R against ^{1}/L
e. Calculate the slope of the graph
f. Evaluate the E and r for one cell, given that
g. Suggest the three possible sources of error and how they can be minimized.
LEARNINGHUBTZ.CO.TZFORM FOUR PHYSICS_PRACTICAL EXAM SERIES 159
PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
FORM FOUR PRACTICAL EXAMINATION
031/2A PHYSICS 2A
(ACTUAL PRACTICAL)
(For Both School and Private Candidates)
Time: 2:30 Hours September 2022 .
Instructions
1. You are provided with a metre rule, knife edge, two strings of length 100cm each and two weights W_{1} and W_{2} of masses 50g and 100g respectively and proceed as follows:
(a) Balance a metre rule on a knife edge, put a mark and write G at the balancing point using a piece of chalk or pencil. Measure and record the length L, with its width W and thickness t of the metre rule using a vernier caliper.
(b) Place the metre rule on a knife edge so that the knife edge is at 60cm of your metre rule (see figure 1(a)). Suspend weight W_{2} of 100g on the right hand side of the knifeedge.
Adjust W_{2} until the metre rule balances horizontally.
Read and record length b and c as seen in the figure 1(a).
(i) Suspend weight W1 of 50g on the left hand side of the knife edge at the position of 47cm and adjust weight W2 until the metre rule balances horizontally as seen in figure 1 (b).
Read and record the lengths “a” and “b”.
(c) Repeat procedures in by adjusting the position of W_{1} to the left at the interval of 3cm to obtain other four (4) readings.
Table of results:
a(cm)  b(cm) 
(d) Plot the graph of “b” against “a”.
(e) What is the nature of the graph?
(f) Calculate the slope (s) of the graph.
(g) (i) Read b – intercept given that
(ii) What does
represent in your graph?
(iii) Calculate the value of W using the relation
What does W represent?
(h) (i) Find the value of the ratio
Note: The mass of m of a metre rule can be obtained by calculations.
(ii) What is the physical meaning of the value of p?
(i) State the possible sources of error in the experiment.
(j) How can you minimize error in 1(i)?
(k) State the aim of experiment.
2. You are provided with two plane mirrors, an optical pin, a sheet of plane, drawing paper, mirror holder or office pins, a protractor, a ruler and a drawing table. Proceed as follows:
(a) Draw two lines at right angles
(b) Place the two plane mirrors along the top two lines using the mirror holder or office pins as shown in figure 3.
(c) Put an optical pin, at O when θ= 90^{o} look onto one of the mirror and count the number of images, n, you see.
(d) Repeat procedures in 2(c) for θ = 72^{o}, θ = 60^{o}, θ=45^{o} and θ=30^{o}.360^{o}
(e) Tabulate your results for the values of θ, n and 360^{o}/θ
(f) Plot a graph of number of images n, against 360^{o}/θ
(g) From the graph
(i) Determine the slope
(ii) Find the number of images if 360^{o}/n =9
(iii) Find the value of yintercept.
(iv) Derive the equation relating the number of images and 360^{o}/θ
(h) From your Experiment
(i) What happens to the number of images as the value of angle is reduced?
(ii) What happens to the number of images, when θ = 0^{o}?
(i) State a possible source of errors and how you can minimize it.
(j) What is the aim of this experiment?
LEARNINGHUBTZ.CO.TZFORM FOUR PHYSICS_PRACTICAL EXAM SERIES 126
PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
PHYSICS 2A (ACTUAL PRACTICAL)
24 HOURS ADVANCED INSTRUCTION
1. IMPORTANT
1.1 Great care must be given not to divulge the instructions to both candidate and unauthorized person either directly or indirectly
1.2 Note that you will not be allowed to open the envelope containing the question paper before commencement of the examination
2.0 Preparation and labeling of chemicals
Question 1
Question 2
PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
FORM IV PRACTICAL EXAMINATION
031 / 2A PHYSICS ACTUAL PRACTICAL 2A
TIME: 3 HOURS
Instructions
Pie = 3.14
Proceed as follows
Initial length Lo = _____ (1mark)
Mass (g)  Force (N)  Length (cm)  Extension e=(LL0)cm 
100 



150 



200 



250 



300 



2. The aim of the experiment is to determine the resistivity of an electrical conductor P
Current (I) 






P.d (v) 






Resistivity = where, d = diameter of wire P and c is the length of the wire P
LEARNINGHUBTZ.CO.TZFORM FOUR PHYSICS_PRACTICAL EXAM SERIES 111
THE PRESIDENT’S OFFICE MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
FORM FOUR PRACTICAL EXAMINATION SERIES
PHYSICS 24 HOURS INSTRUCTIONS
CODE NO. 031/2A
Question one (1)
Question two (2)
PHYSICS 2A (ACTUAL PRACTICAL A) EXAMINATION
INSTRUCTIONS
1. You are provided with the following apparatus: meter rule, Weights of different masses, object p, spiral spring, pointer, pan and retort stand with clamp. Assemble the given apparatus as shown in figure 1 below.
Figure 1 
Procedures
LO =
Mass (g)  20  40  60  80  100  P 
Weight (N) 




 X 
Pointer reading(cm) 






Extension, e = LO – L (cm) 






2. The aim of this experiment is to find the relationship between the angle of rotation of reflected ray from the plane mirror and the angle of the mirror.
You are provided with a white sheet of paper, drawing board, plane mirror with holders, transparent ruler, protractor, optical pins and thumb pins. Proceed as follows:
Figure 2 
Note: Attach your diagrams with the answer booklet. (25marks)
LEARNINGHUBTZ.CO.TZFORM FOUR PHYSICS_PRACTICAL EXAM SERIES 104