Summary

• Description:

  The MS Word document comprises RCEA JOINT Physics Paper 3 2026 Mock Exam with Answers (Marking Scheme). The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Physics Paper 3 practical mock examination designed to test experimental design, systematic data collection, graphical analysis, and empirical verification of physical laws. It evaluates experimental skills in the principle of moments, electrical resistance of uniform wire conductors, and thin lens image projection.

  • Duration: 2 Hours 30 Minutes
  • Total Marks: 40
  • Number of Questions: 2 (Question 1 and Question 2)
  • Structure: Question 1 (20 marks, mechanics and equilibrium of moments) and Question 2 (20 marks, divided into Part A: electricity and potentiometer circuits [15 marks] and Part B: geometrical optics and focal length determination [5 marks]).

  It covers the following topics:

  • Mechanics (The Principle of Moments):
    • Suspending a non-uniform meter rule on knife-edge and spring balance supports
    • Measuring variations in balancing force against suspended load distances
    • Plotting force against distance graphs, slope determination, vertical intercept extraction, and calculating experimental constants
  • Current Electricity (Potential Drop and Resistance):
    • Measuring open-circuit electromotive force (emf) and closed-circuit terminal potential difference
    • Determining internal resistance and circuit constants using standard resistors
    • Investigating potential drops across varying lengths of resistance wire using sliding contacts
    • Tabulating length-voltage ratios and calculating average potential gradients
  • Geometrical Optics (Focal Length of Convex Lenses):
    • Estimating rough focal length using distant object illumination
    • Setting up object-lens-screen apparatus to obtain sharp inverted images of candle flames
    • Evaluating object distance (u) and image distance (v) relationships using the lens formula
• File Size:

  329.06 KB
• Length:

  8 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Physics
• Posted By:

  Caleb_Peter

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