Summary

• Description:

  The MS Word document comprises Physics Paper 3 (Practical) 2026 Pre-Mock Exam with 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) examination. This paper assesses Form 4 candidates on experimental skills — including loading a helical spring, collecting oscillation data, plotting graphs, determining constants, and investigating refraction through a glass prism — testing measurement accuracy, graph work, and application of physical relationships.

  • Duration: 2½ hours
  • Total Marks: 40
  • Number of Questions: 2 (both compulsory)
  • Structure:
    • Question 1 (Section A) – 20 marks
    • Question 2 (Section B) – 20 marks

  It covers the following topics:

  • Question 1 — Helical Spring: Hooke's Law and Simple Harmonic Motion:
    • Measuring the natural length L₀ of a spring
    • Loading masses (50 g to 300 g) and recording extension e = L – L₀ in a data table
    • Plotting a graph of extension e (y-axis) against mass
    • Determining the gradient S of the graph
    • Timing 20 vertical oscillations for masses of 120 g and 150 g (three trials each)
    • Computing average T²/M (value Q) from the oscillation data
  • Question 2 — Refraction through a Triangular Glass Prism:
    • Measuring the prism angle A using a protractor
    • Tracing the prism outline and constructing a normal at the point of incidence
    • Using four optical pins (P1–P4) to define the incident and emergent rays at 60° incidence
    • Extrapolating rays to determine the angle of deviation D
    • Submitting the annotated ray diagram sheet with the question paper
• File Size:

  4.33 MB
• Length:

  10 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  PHYSICS
• Posted By:

  Caleb_Peter

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