February 2025

Comparing the strength of cylindrical and square tube beams

By |2025-02-12T09:09:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the strength of a beam Testing the strength of a beam ZIMSEC O Level Combined Science Notes: Experiment: Comparing the strength of cylindrical and square tube beams

Aim:  To compare the strength of cylindrical and square tubes

Materials: thin cardboard, tin can, sand and glue.

Method

  1. Make a cylindrical tube by rolling a piece […]
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Experiment: To compare the shear and tensile strength of sponge rubber and soft wood

By |2025-02-12T09:26:19+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sheets of made of sponge rubber. Image credit rollsheetrubber.com Sheets of made of sponge rubber. Image credit rollsheetrubber.com ZIMSEC O Level Combined Science Notes: Experiment: To compare the shear and tensile strength of sponge rubber and soft wood

Aim: To compare the shear and tensile strength of sponge rubber and a softwood

Materials: wooden ice-cream […]

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Machines: Gears

By |2025-02-12T09:45:26+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Machines: Gears

  • A gear is a toothed wheel
  • These toothed wheels transfer motion to one another using their teeth
  • Gears are also known as cogs wheels
  • The teeth on a gear are also known as cogs
  • These cog wheels are usually mounted on shafts
  • The teeth of adjacent cogs fit the grooves of the […]
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Teeth and tooth decay

By |2025-02-12T09:16:38+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Good dental care is part of human health. Image credit claimfame.com Good dental care is part of human health. Image credit claimfame.com ZIMSEC O Level Combined Science Notes: Teeth and tooth decay

  • While people enjoy food of all varieties
  • Some types of food
  • For example sweets, chocolates, carbonated drinks, cakes and […]
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Effects of population growth on natural resources

By |2025-02-12T09:00:15+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Environmental degradation in Epworth. Image credit newsday.co.zw Environmental degradation in Epworth. Image credit newsday.co.zw ZIMSEC O Level Combined Science Notes: Population and natural resources

Environmental Effects

  • Soil erosion
  • Deforestation
  • Desertification
  • Reduced soil fertility

Social Effects

  • Overcrowding
  • Criminal activities
  • Immorality
  • Poor health services
  • Poor education facilities
  • General increase in poverty

To […]

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Safety wear

By |2025-02-12T09:10:16+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Safety Equipment Image credit nextmundo.com Safety Equipment Image credit nexomundo.com ZIMSEC O Level Combined Science Notes: Safety wear

  • Pesticides are dangerous and need to be handled with care.
  • The following equipment ought to be used when handling chemicals depending on the instructions of each chemical’s label and its usage directions.

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Experiment: Do plants release carbon dioxide when they respire?

By |2025-02-12T09:45:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Potted plant. Image credit artificialplantsandtrees.com Potted plant. Image credit artificialplantsandtrees.com ZIMSEC Combined Science Revision Notes: Do plants release carbon dioxide when they respire?

Aim: To determine whether all living things, including plants, release carbon dioxide when they respire.

Materials: bell jar or a large container, 3 boiling tubes/flasks glass or rubber tubing, lungs, suction […]

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Ecosystems: The soil

By |2025-02-12T09:39:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Soil profile. Image credit nesoil.com Soil profile. Image credit nesoil.com ZIMSEC O Level Combined Science Notes: Ecosystems: The soil  

  • Soil is an important part of the ecosystem
  • It is a critical component of life on earth and agriculture
  • Soil thickness varies from a few millimeters to a several meters in places
  • Animals and plants […]
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