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 request. The marking scheme is provided in a separate document.

  It is 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.

  Examination Details

  • 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

    • Question 2: Refraction of Light through a Triangular Glass Prism

  Topics Covered

  Question 1: Electricity and Resistivity

  • Micrometer Screw Gauge Measurements

    • Measuring wire diameter

    • Calculating cross-sectional area

  • Circuit Assembly and Connection

    • Setting up dry cells

    • Connecting the switch

    • Connecting the ammeter

    • Connecting the voltmeter

    • Setting up the potentiometer wire

  • Ohm's Law Verification

    • Recording potential difference across different wire lengths

    • Recording current for different wire lengths

  • Data Tabulation and Graph Work

    • Tabulating experimental results

    • Plotting resistance against length in metres

    • Determining the gradient of the graph

  • Material Resistivity Evaluation

    • Determining the wire resistivity constant

    • Using the slope of the graph and cross-sectional area

    • Applying the resistivity relationship

  Question 2: Geometrical Optics and Refraction

  • Optical Pin Tracing

    • Aligning the object pin and search pins

    • Tracing the path of light through an equilateral triangular glass prism

  • Snell's Law and Angle Measurement

    • Varying the angle of incidence, i, from 25 degrees to 45 degrees

    • Measuring the corresponding angle of refraction, r

  • Trigonometric Data Processing

    • Computing sin i

    • Computing sin r

    • Calculating the ratio 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

    • Determining the physical significance of the gradient

• File Size:

  145.51 KB
• Category:

  KCSE Prediction Papers
• Level:

  Form 4
• Subject:

  Physics
• Posted By:

  Caleb_Peter

Enter your details below to initiate a payment using MPESA.