Summary

• Description:

  The MS Word document comprises Mumias West Sub-County Joint Evaluation Physics Paper 3 May 2026 Pre-Mock Exam with Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Physics Paper 3 (Practical) examination. This paper assesses candidates' practical investigation skills through two experiments — one involving oscillatory motion of a metre rule to determine a constant, and another combining electrical circuit measurements with a lens experiment to determine focal length.

  • Month Administered: May 2026
  • Duration: 2½ hours (including 15 minutes reading time)
  • Total Marks: 40
  • Number of Questions: 2 (both compulsory)
  • Structure: Question 1 (20 marks) — oscillation experiment; Question 2 (20 marks) — electrical circuit and optics experiment; calculators permitted

  It covers the following topics:

  • Question 1 — Bifilar Suspension Oscillation Experiment
    • Measurement of metre rule dimensions using vernier calipers
    • Setting up bifilar suspension apparatus and varying thread separation distance (d)
    • Timing 20 oscillations for six values of d (80 cm to 30 cm)
    • Completing a results table (d in metres, 1/d², period T, T²)
    • Plotting a graph of T² against 1/d²
    • Determining the slope of the graph
    • Using the relationship T² = 16K²/(5d²) to calculate the constant K
  • Question 2 — Electrical Resistance and Optics Experiment
    • Part A: Circuit with dry cells, resistor Q, and a wire on a millimetre scale; measuring EMF (open circuit voltage) and terminal voltage; varying wire length L and recording voltmeter readings; calculating 1/L, 1/V, and Z = (1/L)(1/V); determining average value of Z
    • Part B: Converging lens experiment — determining focal length by focusing a distant object; measuring image distance v for object distances u = 40 cm and u = 50 cm; calculating magnification m = v/u
• File Size:

  883.75 KB
• Length:

  8 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  PHYSICS
• Posted By:

  Caleb_Peter

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