Summary

• Description:

  The MS Word document comprises KCSE 2026 Physics Paper 3 Prediction Paper with Answers (Set 1). The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Physics Paper 3 prediction examination designed to prepare candidates for the national assessment.

  This practical paper evaluates candidates' hands-on experimental setup, data collection, graphical analysis, and evaluation of fundamental physical constants in electricity and geometrical optics.

  • Duration: 2 Hours 30 Minutes
  • Total Marks: 40
  • Number of Questions: 2 (Questions 1 - 2)
  • Structure: Two compulsory practical experiments carrying 20 marks each: Question 1 (Current Electricity and Resistivity) and Question 2 (Refraction of Light through a Triangular Glass Prism).

  It covers the following topics:

  • Question 1 (Electricity and Resistivity):
    • Micrometer Screw Gauge Measurements (Wire diameter and cross-sectional area calculation)
    • Circuit Assembly and Connection (Setting up dry cells, switch, ammeter, voltmeter, and potentiometer wire)
    • Ohm's Law Verification (Recording potential difference and current across varied wire lengths)
    • Data Tabulation and Graph Work (Plotting resistance against length in metres, gradient determination)
    • Material Resistivity ($\rho$) Evaluation (Determining wire resistivity constant using the slope of the graph and cross-sectional area)
  • Question 2 (Geometrical Optics and Refraction):
    • Optical Pin Tracing (Aligning object and search pins through an equilateral triangular glass prism)
    • Snell's Law and Angle Measurement (Varying angle of incidence $i$ from 25° to 45°, measuring corresponding angle of refraction $r$)
    • Trigonometric Data Processing (Computing $\sin i$, $\sin r$, and the ratio $\frac{\sin i}{\sin r}$)
    • Graphical Plotting and Gradient Analysis (Plotting $\sin i$ against $\sin r$, determining the slope of the linear graph)
    • Refractive Index Determination (Evaluating the average refractive index $\eta$ and physical significance of the gradient)
• File Size:

  145.51 KB
• Category:

  KCSE Prediction Papers
• Level:

  Form 4
• Subject:

  Physics
• Posted By:

  Caleb_Peter

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