February 2025

Types of fuel

By |2025-02-12T09:01:00+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Engen Garage. Image credit chronicle.co.zw Engen Garage. Image credit chronicle.co.zw ZIMSEC O Level Combined Science Notes: Types of fuel

  • A fuel is any type of material that can be made to react (commonly with oxygen) and release energy in the process
  • Fuel provides energy to a body/machine to do work
  • Fuels […]
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Electric Power equations and calculations

By |2025-02-12T09:31:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Electric Power equations and calculations

  • Power calculations that you are going to be presented with in the exam are varied
  • They all depend on your knowing:
  • The equation to calculate whatever variable that you are required to calculate
  • Your ability to substitute and change the subject of the formula to suit your needs

    • […]

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Introduction to Trusses

By |2025-02-12T09:13:06+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Roof trusses. Image credit myrooff.com Roof trusses. Image credit myrooff.com ZIMSEC O Level Combined Science Notes: Introduction to Trusses

  • A truss is a supporting framework for a roof, bridge or any other large structure
  • Box and rectangular truss frameworks are inherently weak and susceptible to shear force

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Experiment: To compare the resistance of different woods to termite attack

By |2025-02-12T09:28:10+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Treated poles. Image credit lynnridgetimbers.co.za Treated poles. Image credit lynnridgetimbers.co.za ZIMSEC O Level Combined Science Notes: Experiment: To compare the resistance of different woods to termite attack

Aim: To compare the resistance of different types of wood to termite attack

Materials: gloss paint, used motor oil, creosote, 4 samples of softwood (pine), 4 samples of […]

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Pumps: Lift pump

By |2025-02-12T09:03:23+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Pumps: Lift pump

  • It has a cylinder
  • A piston
  • Two valves and
  • a spout
  • They make use of atmospheric pressure which forces fluid (water) into the pump through valves
  • Valves allow fluid to only flow in one direction
  • At any given point there is one valve open and another closed

 

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Substance abuse: Alcohol

By |2025-02-12T09:23:13+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Glasses of wine. Image credit pickywallpapers.com Glasses of wine. Image credit pickywallpapers.com ZIMSEC O Level Combined Science Notes: Substance Abuse: Alcohol

  • Alcohol is a legal and socially acceptable drug
  • It is however a poison
  • It is addictive and can lead to ill-health and even death
  • It is a depressant drug
  • It […]
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The purification of Water

By |2025-02-12T09:08:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Water Purification Plant. Image credit cdrmaguire.com Water Purification Plant. Image credit cdrmaguire.com ZIMSEC O Level Combined Science Notes: The purification of Water

  • Large residential areas such as Harare, Chitungwiza and other urban establishments are supplied with piped running water
  • This water is treated so that it is safe to drink and […]
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