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  1. The Polar Coordinate System
    by Dr. Osama M. Khaled — published Aug 24, 2026 — last modified Aug 28, 2026 09:44 PM — filed under: Year 12
    Covers the pole, polar axis, directed angle, negative values of r, multiple representations of the same point, and the relations between polar and Cartesian ...
    Located in Mathematics / Calculus / From Geometry to Coordinate Geometry
  2. The Waterfall Model
    by Dr. Osama M. Khaled — published May 28, 2026 — last modified Jun 04, 2026 09:24 AM — filed under: Year 11, Year 12, Undergraduate
    This quiz assesses understanding of the waterfall model’s phases, characteristics, strengths, weaknesses, and appropriate use contexts.
    Located in Computing / … / Software Processes / Software Process Models
  3. Thermal Expansion: Thermometers, Bimetallic Strips, and Linear Expansion
    by Dr. Osama M. Khaled — published Aug 08, 2026 — last modified Aug 09, 2026 10:26 PM — filed under: Year 11, Year 12
    Understand how materials expand with temperature, how that principle drives thermometers and bimetallic strips, and how to calculate linear expansion.
    Located in Physics / Temprature and Heat
  4. Transfer of Heat: Conduction
    by Dr. Osama M. Khaled — published Aug 13, 2026 — last modified Aug 13, 2026 06:22 AM — filed under: Year 11, Year 12
    Learn how heat conducts through materials at the molecular level, compare the conductivity of common substances, and calculate heat flow through an object.
    Located in Physics / Change of State and Transfer of Heat
  5. Transfer of Heat: Convection and Radiation
    by Dr. Osama M. Khaled — published Aug 13, 2026 — last modified Aug 13, 2026 06:32 AM — filed under: Year 11, Year 12
    Understand how heat moves through fluids by convection and through empty space by radiation, and see how these two methods explain everyday phenomena.
    Located in Physics / Change of State and Transfer of Heat
  6. Under Pressure: Units and Causes
    by Dr. Osama M. Khaled — published Jul 14, 2026 — last modified Jul 14, 2026 08:01 AM — filed under: Year 9, Year 11, Year 12
    Define pressure, calculate it from force and area, and convert among pascals, atmospheres, torr, and mmHg
    Located in Chemistry / Gases
  7. Vacuoles and Cell Sap
    by Dr. Osama M. Khaled — published Jun 15, 2026 — last modified Jun 15, 2026 09:26 PM — filed under: Year 8, Year 11, Year 12
    Focuses on plant vacuoles (tonoplast, cell sap, hyperosmotic conditions), contractile vacuoles in single-celled organisms, and the role of vacuoles in storing ...
    Located in Biology / Cell Structure
  8. Valid Arguments
    by Dr. Osama M. Khaled — published Sep 13, 2026 — last modified Sep 14, 2026 01:26 AM — filed under: Year 11, Year 12
    Covers hypotheses, conclusions, valid argument as tautology, proof sequences, and correctness/completeness.
    Located in Mathematics / … / Formal Logic / Propositional Logic
  9. Work, Heat, and q = mcΔT
    by Dr. Osama M. Khaled — published Aug 02, 2026 — last modified Aug 06, 2026 09:58 PM — filed under: Year 11, Year 12
    Find the work of expansion and compression and use specific heat to calculate heat, temperature change, or mass
    Located in Chemistry / Energy and Chemistry
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