Summary

• Description:

  The MS Word document comprises CEKENAS Physics Paper 3 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 CEKENAS Form 4 Physics Paper 3 practical examination evaluating experimental competencies in electrical resistance, optics, and mechanical oscillations. An indispensable resource for hands-on KCSE practical revision, available for PDF download with complete marking scheme details.

  • Month Administered: March/April 2026
  • Duration: 2 ½ Hours
  • Total Marks: 40 Marks
  • Number of Questions: 2 (Questions 1 and 2)
  • Structure: Question 1 (20 marks, Electricity/Metre bridge circuit experiment) and Question 2 (20 marks, Part A Optics lens displacement [6 marks] & Part B Cantilever mass oscillations [14 marks]).

  It covers the following topics:

  • Question 1: Electricity & Metre Bridge
    • Determining resistance and electrical resistivity of wire Y using parallel resistor combinations
    • Locating zero deflection points on a Wheatstone metre bridge wire
    • Graph plotting of $1/X$ against $1/L$ and slope determination
    • Wire Y cross-sectional area calculation using micrometer screw gauge measurements
  • Question 2: Optics & Mechanics
    • Part A (Optics): Convex lens focal length estimation, image magnification/diminution lens positions $P$ and $P'$, displacement distance $d$, and focal length constant determination
    • Part B (Mechanics): Vernier caliper measurements of metre rule dimensions, clamped cantilever loaded oscillations, timing 10 oscillations, calculating period $T$ and $T^2$, and calculating the elastic constant $k$
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  PHYSICS
• Posted By:

  Caleb_Peter

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