February 2025

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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Delegation

By |2025-02-12T09:40:31+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

Delegation. Image credit blackenterprise.com Delegation. Image credit blackenterprise.com

ZIMSEC O Level Business Studies Notes: Delegation

  • Delegation-is the transfer of authority and responsibility by a superior/manager to a subordinate
  • to carry out specific function,duties and tasks
  • The delegator remains accountable for the outcome of the delegated work
  • Delegation results in decentralisation

[…]

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Written Communication

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

Written Communication. Image credit theodysseyonline.com

ZIMSEC O Level Business Studies Notes: Written Communication

  • Involves any type of message that involves the use of the written word
  • It includes things like emails, reports, letters, instant messages (Whatsapp and Facebook)

Advantages

  • Same message can be delivered to different receives with speed e.g. an […]
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Bantu Migrations

By |2025-02-12T08:59:23+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

A mud hut reminiscent of the Early Iron Age. Image credit Pininterest.com

ZIMSEC O Level History Notes: Early Societies (Late Stone Age – Early Iron Age): Bantu Migrations

  • Bantu migrations are believed to have been caused by the use of iron
  • The Bantu are a group of about 300-400 enthinic groups from […]
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Trade in the Mutapa State

By |2025-02-12T09:13:52+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

Gold is one of the items traded in Mutapa kingdom. Image credit idolator.com

ZIMSEC O Level History Notes: The Mutapa State (Kingdom): Trade in the Mutapa State

  • Three types of trade were done in the Mutapa state
  • That is, internal trade with the locals,
  • inter-regional trade with other states like the Ndebele […]
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Possible solutions to the refugee problem

By |2025-02-12T09:25:12+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

A Sudanese refugee. Image credit aljezeera.net

ZIMSEC O Level Geography Notes:Refugees: Possible solutions to the refugee problem

  • These include both long term and short term solutions for the host countries.

Repatriation

  • This is the return of refugees to their source country when the source of danger has been removed
  • This is very expensive […]
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