O Level Science Notes Archives - Page 31 of 33 - Free ZIMSEC & Cambridge Revision Notes

Experiment: To measure the potential difference of a simple cell

By garikaib|2025-02-12T09:36:15+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing simple cell electrodes ZIMSEC O Level Combined Science Notes: Experiment: To measure the potential difference of a simple cell

Aim: To measure the potential difference of a simple cell when different electrodes are used

Materials: dilute sulphuric acid, voltmeter, beaker, leads and crocodile clips, magnesium ribbon,lead foil, copper foil, […]

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Electric motors

By garikaib|2025-02-12T09:00:36+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A simple motor. Image credit youtube.com ZIMSEC O Level Combined Science Notes: Electric motors

An electric motor converts electrical energy into kinetic energy
This is caused by the interaction of the electrical field of the coil and
The magnetic field of the magnets in the […]

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Experiment: Comparing roof truss structures

By garikaib|2025-02-12T09:15:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A bridge made of ice cream sticks. Image credit pinterest.com ZIMSEC O Level Combined Science Notes:Experiment: Comparing roof truss structures

Aim: To determine which structure is best for roof trusses/bridge girders

Materials: Poplar wood /ice cream sticks/grass straws, stikistuff/drawing pins/glue, tin of sand, […]

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Pier Bridge

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

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)

[…]

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Pumps: Lift pump
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Pumps: Lift pump

Notes, O Level Science Notes, Ordinary Level Notes

Pumps: Lift pump

By garikaib|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: Smoking

By garikaib|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 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 […]

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Contraception: The pill

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

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 […]

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Centralised Sewage Treatment Works

By garikaib|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 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 […]

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Carbon Dioxide and Photosynthesis
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Carbon Dioxide and Photosynthesis

Notes, O Level Science Notes, Ordinary Level Notes

Carbon Dioxide and Photosynthesis

By garikaib|2025-02-12T09:37:48+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science: Carbon Dioxide and Photosynthesis

Aim: To test whether carbon dioxide is necessary for photosynthesis.

Materials: Potted green plants, potassium hydroxide solution (soda lime), two polythene bags/two bell jars, string, apparatus and reagents for the start test.

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