February 2025

Pier Bridge

By |2025-02-12T09:29:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A pier bridge. Image credit sehinc.com A pier bridge. Image credit sehinc.com ZIMSEC O Level Combined Science Notes: Pier Bridge

  • A simple bridge is also known as a span bridge
  • It is made up of reinforced concrete and
  • it spans across the gap
  • It’s maximum possible span (length which it transverses)

    • […]

Read More
Comments Off on Pier Bridge

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

 

Read More
Comments Off on Pumps: Lift pump

Substance Abuse: Smoking

By |2025-02-12T09:22:39+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A man smoking and selling Tobacco at an Auction floor. Image credit voanews.com A man smoking and selling Tobacco at an Auction floor. Image credit voanews.com ZIMSEC O Level Combined Science Notes: Substance Abuse: Smoking

  • In most countries including smoking is legal
  • It is also socially accepted
  • Cigarette smoke(tobacco smoke) contains […]
Read More
Comments Off on Substance Abuse: Smoking

Contraception: The pill

By |2025-02-12T09:39:17+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit citifmonline.com Image credit citifmonline.com ZIMSEC O Level Combined Science Notes:Contraception: The pill

  • Are also known as birth control pills (BCPs) or
  • Oral Contraceptive Pills (OCPs)

How it works

  • They contain the two female hormones: oestrogen and progesterone
  • They prevent the release of ova/female sex cells
  • They cause growth of an […]
Read More
Comments Off on Contraception: The pill

Centralised Sewage Treatment Works

By |2025-02-12T09:06:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sewage treatment works at Morton Jaffray,Harare. Image credit hararenews.co.zw Sewage treatment works at Morton Jaffray,Harare. Image credit hararenews.co.zw ZIMSEC O Level Combined Science Notes: Centralised Sewage Treatment Works

  • Are used to collect and treat sewage waste from large industrial and residential areas
  • They treat large quantities of human waste
  • The raw […]
Read More
Comments Off on Centralised Sewage Treatment Works

Performance Related Pay

By |2025-02-12T09:24:46+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

Performance related pay can improve performance. Image credit loophaiti.com Performance related pay can improve performance. Image credit loophaiti.com ZIMSEC O Level Business Studies Notes: Performance Related Pay

  • A financial reward system for employees where some or all
  • of their monetary compensation is related to how their performance
  • This performance is based […]
Read More
Comments Off on Performance Related Pay

Job description

By |2025-02-12T09:44:33+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

Job description. Image credit atlantablackstar.com Job description. Image credit atlantablackstar.com

ZIMSEC O Level Business Studies Notes: Job description

  • it is a formal account of an employee’s responsibilities
  • is a formal summary of the duties of a position
  • it states the essential responsibilities of the job
  • It often comes in the form of a […]
Read More
Comments Off on Job description

Upward, Downward, Horizontal Communication

By |2025-02-12T09:25:52+02:00February 12th, 2025|Notes, O Level Business Studies Notes, Ordinary Level Notes|

Horizontal communication is between peers. Image credit life.wevorce.com

ZIMSEC O Level Business Studies Notes: Leadership: Upward, Downward, Horizontal Communication

  • When it comes to direction communication can be classified as horizontal, downward or upward
  • Downward communication follows the chain of command from the topmost levels to the subordinates
  • This can be used […]
Read More
Comments Off on Upward, Downward, Horizontal Communication

Effects of the usage of iron

By |2025-02-12T09:00:44+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

An Iron Age compound (reconstruction). Image credit archaeology.org

ZIMSEC O Level History Notes: Early Societies (Late Stone Age – Early Iron Age): Effects of the usage of iron

  • the effects of the usage of iron during the Iron Age can be divided into various groups:

Economic effects

  • The introduction made it possible for […]
Read More
Comments Off on Effects of the usage of iron

Military of the Mutapa Organisation of the Mutapa State

By |2025-02-12T09:14:52+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

African Spear. Image credit swordsantiqueweapons.com

ZIMSEC O Level History Notes: The Mutapa State (Kingdom): Military of the Mutapa Organisation of the Mutapa State

  • The Mutapa did not have a standing army
  • The army was mobilized from peasants when there was an emergency
  • The war council in the Mutapa state was known as […]
Read More
Comments Off on Military of the Mutapa Organisation of the Mutapa State
Toggle Sliding Bar Area
Go to Top