February 2025

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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The concept of pressure

By |2025-02-12T08:59:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

 ZIMSEC O Level Combined Science Notes: The concept of pressure
  • Pressure is the force acting over an area
  • In such pressure is usually the force per unit area exerted by a fluid/gas
  • over a surface with which it is in contact
  • \text{Pressure=} \dfrac{Force}{Area}
  • If a big force is exerted over a small area it results high pressure
  • An example […]
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Experiment: Finding conditions necessary for growth of microorganisms

By |2025-02-12T09:19:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Mouldy bread and their conditions. Image credit Mouldy bread and their conditions. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Finding conditions necessary for growth of microorganisms

Aim: To determine factors affecting the growth of microorganisms in food

Materials:  3 containers with sterilized lids, brad, milk, burners, drying agent (calcium chloride)

Method

  1. Pour […]
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Contraception:Ways to prevent pregnancy

By |2025-02-12T09:37:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

There are several major methods of contraception. Image credit relationshipplaybook.com There are several major methods of contraception. Image credit relationshipplaybook.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

  • Contraception-the deliberate use of artificial methods or other techniques to prevent pregnancy as a consequence of sexual intercourse
  • Common methods of contraception […]
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The Test for starch

By |2025-02-12T09:35:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

  • During the process of photosynthesis, a plant absorbs, a process which is aided by the presence of chlorophyll in the leaf
  • This enables the plant to convert carbon dioxide and water into glucose
  • Some of this glucose is used up by the plant however
  • Any excess is turned into starch for storage
  • You can, therefore, test a plant’s leaf for starch in […]
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Investigating the movement of water within plants

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

A celery plant in dye. Image credit wordpress.com A celery plant in dye. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Investigating the movement of water within plants

Aim: To demonstrate that moves up plants which have a transportation system.

Materials: Young plants with roots/celery plants, water, hand lenses, razor blade/scalpel, food colouring/dye.

Method

  1. Place […]
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