FORM FOUR PHYSICS_PRACTICAL EXAMS SERIES

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:

1. This paper consists of two questions. Answer all questions.
2. Calculation should be shown clearly.
3. The following information may be useful.

π= 3.14

Acceleration due to gravity, g = 10m/s2

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

1. Tie a piece of thread to an iron metal ball to form a pendulum.
2. Suspend the pendulum from two clamped pieces of wood.
3. Adjust the length L of the pendulum to 140 cm.
4. Displace and set the ball to start oscillating through a small angle.
5. Record the time t for 10. complete oscillations by using stop watch
6. Repeat this experiment for value of L = 120cm, 100cm, 80cm, 60cm and 40cm, and record your data as shown in the table below.
 Length L(cm) 140 120 100 80 60 40 Time for 10 oscillations (s) Period time T(s) T2(s2)

Questions

1. Complete the table above.
2. Plot the graph of L against T2
3. Find the slope from the graph..
4. Use the answer you obtain in (iii) above to find the value of g given that 1. Give the physical meaning of g.
2. Mention two effects of g.

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. This paper consists of two (2) questions.
3. Cellular phones and any unauthorized materials are not allowed in the examination room.
4. Where calculations are involved show your work systematically.
5. Mathematical tables and non-programmable calculators may be used.
7. Use acceleration due to gravity = 10m/s2.
8. Use π= 3.14

1. You are provided with a metre rule, knife edge, two strings of length 100cm each and two weights W1 and W2 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 W2 of 100g on the right hand side of the knife-edge.

Adjust W2 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 W1 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 (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= 90o look onto one of the mirror and count the number of images, n, you see.

(d) Repeat procedures in 2(c) for θ = 72o, θ = 60o, θ=45o and θ=30o.360o

(e) Tabulate your results for the values of θ, n and  360o

(f) Plot a graph of number of images n, against 360o

(g) From the graph

(i) Determine the slope

(ii) Find the number of images if 360o/n =9

(iii) Find the value of y-intercept.

(iv) Derive the equation relating the number of images and 360o

(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 = 0o?

(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

### FORM IV PRACTICAL EXAMINATION

PHYSICS 2A (ACTUAL PRACTICAL)

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

• retort stand with its accessories
• metre rule
• scale pan
• Stop watch
• Masses of 50g, 100g, 200g
• Spring which can extend 6cm by 50g mass

Question 2

• 8 connecting wires
• 2 dry cell (ABC super electric size D, 1.5V)
• Voltmeter (0-2V)
• Ammeter (0-1A)
• Constant wire SWG 28 of 100cm
• Plug key
• Rheostat (0-200ohm)

PRESIDENT’S OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

FORM IV PRACTICAL EXAMINATION

031 / 2A PHYSICS ACTUAL PRACTICAL 2A

TIME: 3 HOURS

Instructions

1. This paper consists of total of two (2) questions
3. Marks for each question thereof indicated
4. Non-programmable calculators may be used
5. Cellular phones are not allowed in the examination room
7. The following constants may be used
Acceleration due to gravity, g = 10m/s2 or 10N/kg

Pie = 3.14

1. The aim of this experiment in figure below is to verify Hooke’s using a spring

Proceed as follows 1. Set up the apparatus as shown in the figure above
2. Record the length Lo indicated by the pointer without mass on the spring
3. Place a 50g mass on the spring and record the new length L
4. Repeat this procedure for m= 100g, 150g, 200g and 250g each time measure the responding length (L)
5. Tabulate your results as follows

Initial length Lo = _____ (1mark)

 Mass (g) Force (N) Length (cm) Extension e=(L-L0)cm 100 150 200 250 300
1. Complete the table
2. Plot a graph of force (N) against extension e (cm) (7marks)
3. What are the values of intercepts? (2marks)
4. Determine the slope of the graph (3marks)
5. What is the physical meaning of the slope (2marks)
6. What are the possible source of errors (2marks)
7. State the law which governed the experiment (3 marks)

2. The aim of the experiment is to determine the resistivity of an electrical conductor P 1. With P having a length of 50cm, connect up the circuit as shown above, close the key and adjust Rheostat Rh so that the current in Ammeter is 0.2A. record the current I and potential difference between its ends
2. Repeat the procedure with correct I = 0.30A, 0.40A, 0.50A and 0.60A.
3. Record your results in table below
 Current (I) P.d (v)
1. Plot a graph of V against I and calculate slope G
2. Deduce resistivity of the conductor of the wire P given that

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)

• 1 Spiral spring
• 1 Retort stand with its accessories
• 1 Meter ruler
• 1 Pendulum bob
• 1. Scale pan
• 1 Pointer
• Masses of 20g, 40g,60g, 80g and 100g
• 1 graph paper

Question two (2)

• 1 white sheet of paper
• 1 protector
• 4 optical pins
• 4 thumb pins
• 1 drawing board
• 1 plane mirror
• 1 graph paper
• Transparent ruler

PHYSICS 2A (ACTUAL PRACTICAL A) EXAMINATION

INSTRUCTIONS

1. This paper consists of two (2) questions
3. Whenever calculations are involved show your work Cleary
4. Marks for questions are indicated at the end of each question
5. Cellular phones are NOT allowed in the examination room
6. Calculators may be used whenever necessary
8. If necessary use g = 10m/s2

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

1. Record the pointer reading on the scale of meter rule when the pan is empty as LO
2. Put 20g to the pan and record pointer reading as L
3. Find extension, e = LO – L
4. Repeat the procedures for masses of 40g, 60g, 80g and 100g
5. Put object P on a pan and record its extension
6. Summarize your results as follows

LO =

 Mass (g) 20 40 60 80 100 P Weight (N) X Pointer reading(cm) Extension, e = LO – L (cm)
1. Plot a graph of tension, T (weight in N) against extension, e (cm)
2. Determine the slop S of your graph
3. Give the property experienced by a spiral spring
4. Suggest the aim of this experiment
5. Identify and state the law governing this experiment
6. What is the physical meaning of the slop obtained in 1 (h) above
7. Use your graph to find the value of P and X given in table 1 above
8. State two sources of errors and suggest their control measures (25 marks)

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:

1. Put the drawing paper on the drawing board using thumb pins and draw two straight lines AB and CD to enclose an angle of α =l0°. Draw the line through 0 making 75° with AB. Then insert two optical pins P and Q on this line as shown in Figure.2. Figure 2
1. Place the reflecting surface of the mirror along AB. Place other optical pins R and S to appear in straight line with images of P and Q. Remove the pins R and S and join the line ORS.
2. Turn the mirror through an angle α = 10° so that its reflecting surface lies along CD. Stick pins T and U to appear in line with the images of P and Q. Join the line OUT. Record the angle β° formed by RS and UT.
3. Repeat the experiment for α =l5°, 20°, 25° and 30° on the separate paper for each case
5. Plot a graph of β° against α°
6. Determine the slope of your graph.
7. Find the reciprocal of the slope.
8. From your graph, deduce the relationship between β° and α°
9. Describe the significance of the slope obtained in 2 (g)
10. Suggest any two sources of errors and their precautions.