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Physics Paper 3: Form 4 QA Model – Document ID 20250302001

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Section 1: Electrical Experiment

  1. Set up the circuit as shown in Figure 1. Z is one of the 10 ohm carbon resistors.
  2. Close the switch. Tap the jockey at various points on the wire AB and locate point P at which the galvanometer shows zero deflection. Measure and record in Table 1 the length aa, where a=PBa = PB.
  3. Repeat the procedure for:
    • Two 10Ω resistors in parallel
    • Three resistors in parallel
    • Four resistors in parallel
    • Five resistors in parallel
    • Six resistors in parallel
      Record your readings in Table 1. Complete the table. XX is the effective resistance for the parallel combination, i.e., X=10nX = \frac{10}{n} where nn is the number of resistors in parallel.
  4. Plot a graph of 1a\frac{1}{a} (y-axis) against 1X\frac{1}{X} (5 marks).
  5. Determine the slope mm of the graph (2 marks).
  6. Use the graph to determine RR given that 1a=RK⋅1X+1K\frac{1}{a} = \frac{R}{K} \cdot \frac{1}{X} + \frac{1}{K} where K=100K = 100 cm (2 marks).
  7. Measure the diameter dd and the length LL of wire Y and hence determine its cross-sectional area AA (2 marks).
  8. Determine the resistivity of the wire Y given that its resistance R=ρLAR = \frac{\rho L}{A} (3 marks).

Section 2: Mechanical Experiment

  1. Determine the c.o.g of the metre rule using the knife edge (1 mark).
  2. Set up the apparatus as shown. Using a string, hang the 100g mass on the c.o.g of the metre rule.
  3. Adjust the position of the pivot so that it is approximately 5cm from the free end of the metre rule (5 marks).
  4. Measure and record the length hh of the coiled part of the spring and distance dd from the pivot to the point where the spring is attached to the metre rule.
  5. Repeat the measurements for different positions of the pivot along the metre rule as shown in the table (5 marks).
  6. Plot a graph of hh (y-axis) against 1d\frac{1}{d} (5 marks).
  7. Determine the gradient mm and y-intercept cc of the line (2 marks for mm, 1 mark for cc).
  8. Determine:
    • (i) The weight WW of the metre rule using the 100g mass (1 mark).
    • (ii) The spring constant KK using the 100g mass (2 marks).
  9. Use your measurements to determine the relationship between dd and hh using the given equation h=Bd+Ah = \frac{B}{d} + A where AA and BB are constants (1 mark for ZZ and 1 mark for L0L_0).

These questions encompass a range of practical tasks that assess students’ understanding of electrical circuits and mechanical principles, emphasizing experimental design, data collection, and analysis.

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Description

The document titled “KCSE MOCK-PHYSICS PAPER 3 QA MODEL” is designed for students preparing for the Kenya Certificate of Secondary Education (KCSE) practical examination in Physics. This paper provides a comprehensive assessment of students’ practical skills and understanding of physics concepts through structured experiments and data analysis.

Overview of the Document

Instructions to Schools

The document begins with specific instructions intended for the head of the school and the Physics teacher. Key points include:

  • The information is confidential and should not be disclosed to candidates.
  • A list of required apparatus for each candidate is provided to ensure adequate preparation for the practical examination.
  • The teacher is responsible for ensuring that the apparatus meets specified requirements.
  • The question paper must not be opened in advance, and teachers should refrain from performing the experiments themselves.

Apparatus Required

Each candidate is expected to have access to the following apparatus for the practical examination:

  1. Electrical Experiment:
    • Centre zero galvanometer
    • Size D dry cell and cell holder
    • Switch
    • Connecting wires with crocodile clips
    • Nichrome wire and resistance wire mounted on a millimeter scale
    • Carbon resistors
    • Jockey or crocodile clip
    • Micrometer screw gauge
  2. Mechanical Experiment:
    • Spiral spring with a specific spring constant
    • Complete stand
    • Metre rule
    • 100g mass
    • Knife edge and wedges

Structure of the Practical Examination

The document consists of two main sections, each containing a series of practical tasks that students must perform and record their observations.

Section 1: Electrical Experiment
  1. Circuit Setup: Candidates are instructed to set up a circuit with a galvanometer and conduct experiments to determine the effective resistance of various combinations of resistors in parallel.
  2. Data Recording: Students are required to measure and record the lengths of wire corresponding to zero deflection on the galvanometer, complete a data table, and calculate the effective resistance.
  3. Graphing: Candidates must plot a graph of 1a\frac{1}{a} (y-axis) against 1X\frac{1}{X} (x-axis) and determine the slope of the graph to find the resistance RR.
  4. Resistivity Calculation: By measuring the diameter and length of the nichrome wire, students calculate its cross-sectional area and subsequently its resistivity.
Section 2: Mechanical Experiment
  1. Centre of Gravity Determination: Candidates are tasked with determining the center of gravity (c.o.g) of a metre rule using a knife edge.
  2. Spring Constant Measurement: Using a 100g mass, candidates adjust the position of the pivot and measure the extension of the spring.
  3. Data Recording for Multiple Positions: Students record the length of the coiled part of the spring and the distance from the pivot for various pivot positions.
  4. Graphing: A graph of hh (y-axis) against 1d\frac{1}{d} is plotted to analyze the relationship between the height and the distance.
  5. Calculating Weight and Spring Constant: Students calculate the weight of the metre rule and the spring constant based on their measurements.

Marking Scheme

The document includes a marking scheme for each question, indicating the maximum score for each part of the practical tasks, allowing for clear assessment criteria.

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