Summary

• Description:

  The MS Word document comprises BURAMU III 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 KCSE Physics Paper 3 (232/3) practical examination assessing candidate mastery in experimental apparatus setup, precise physical measurements, data recording, graphical analysis, slope evaluation, and laboratory safety protocols.

  Hands-on practical execution is an essential scoring area in the senior secondary school physics curriculum. This paper provides step-by-step experimental instructions covering simple harmonic motion in suspended systems, calorimetry, optical bench image formation, and electrical resistance determination. Downloading this practical test file helps students master laboratory measurement techniques, tabulate empirical data accurately, plot best-fit lines, and deduce physical constants under timed examination conditions.

  • Month Administered: July 2026
  • Duration: 2 Hours 30 Minutes
  • Structure: Question 1 (Part A: Harmonic Oscillations of Suspended Metre Rule & Part B: Heat Capacity and Heat Loss Analysis) and Question 2 (Part A: Concave Mirror Focal Length & Part B: Resistance Wire Measurement and Resistivity Evaluation).

  It covers the following topics:

  • Question 1: Mechanics, Oscillations, and Thermodynamics
    • Part A (Harmonic Oscillations): Setting up a suspended double metre-rule system, timing 20 complete oscillations across variable support distances $D$, calculating periodic time $T$ and $T^2$, plotting $D$ versus $T^2$ graphs, evaluating graph slope at $D = 25\text{ cm}$, and interpolating periodic time at specific lengths
    • Part B (Calorimetric Analysis): Mass measurements, reading room temperature $T_0$, initial cold water temperature $T_c$, boiling water temperature $T_b$, and final mixture temperature $T_f$ following hot metal immersion in lagged plastic beakers, followed by heat loss $Q$ calculations using $Q = 1.7 \times 10^3 M S (T_b - T_f)$
  • Question 2: Geometrical Optics and Current Electricity
    • Part A (Concave Mirror Optics): Optical bench alignment, locating sharp inverted candle flame images on a screen across object distances $u = 20\text{ cm}, 25\text{ cm}, 35\text{ cm}$, measuring image distances $v$, computing magnification $M = \frac{v}{u}$, calculating focal lengths $f = \frac{v}{1+M}$, and finding average focal length $f_{av}$
    • Part B (Electricity and Resistivity): Measuring wire diameter $d$ using a micrometer screw gauge, measuring wire length $L$ between terminals $P$ and $Q$ with a metre rule, calculating geometric constant $X = \frac{4L^2}{d}$, setting up electrical circuits with ammeters and voltmeters, taking voltage $V$ and current $I$ readings, determining resistance $R = \frac{V}{I}$, and evaluating resistivity constant $\rho = \frac{R}{X}$
• File Size:

  1.94 MB
• Length:

  8 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  PHYSICS
• Posted By:

  Caleb_Peter

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