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

The dry electric cell

By garikaib|2025-02-12T09:37:08+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The components of a dry cell ZIMSEC O Level Combined Science Notes: The dry electric cell

About 1.5 V is produced in a dry cell
This voltage falls as the voltage falls as the cell goes “flat” as the chemicals are used up
A dry […]

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Experiment: Demonstrating that an electric wire moves in a magnetic field

By garikaib|2025-02-12T09:01:21+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Demonstrating the motor effect. Image credit ideas-inspire.com ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating that an electric wire moves in a magnetic field

Aim: To demostrate how a current carrying wire moves in a magnetic field

Materials: a length of flexible wire, small pieces of cardboard […]

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Methods of Joining materials

By garikaib|2025-02-12T09:16:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Joining parts of a plane. Image credit airportjournals.com ZIMSEC O Level Combined Science Notes:Methods of Joining materials

Building structures such as bridges and pylons using solid material would be needlessly expensive
Most of this material would be in a neutral zone where it […]

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Arch bridges

By garikaib|2025-02-12T09:30:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

An arch bridge ZIMSEC O Level Combined Science Notes: Arch bridges

In an arch bridge the arch acts to support a load by converting the downward force into sideways thrust
Arches can make structures last longer for example old buildings and structures in European countries have lasted as […]

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Pumps: Force pump

By garikaib|2025-02-12T09:04:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A solar force pump. Image credit sunfuel.co.in ZIMSEC O Level Combined Science Notes: Pumps: Force pump

A force pump:
Has a cylinder, piston, two valves and a spout (outlet)
It makes use of atmospheric pressure to force fluid/water into the pump through valves
The […]

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Substance abuse: Alcohol

By garikaib|2025-02-12T09:23:13+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Glasses of wine. Image credit pickywallpapers.com ZIMSEC O Level Combined Science Notes: Substance Abuse: Alcohol

Alcohol is a legal and socially acceptable drug
It is however a poison
It is addictive and can lead to ill-health and even death
It is a depressant drug
It […]

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Injection (Depo Provera)

By garikaib|2025-02-12T09:40:01+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit star.ng ZIMSEC O Level Combined Science Notes:Contraception:Injection (Depo Provera)

Also simply known as Depo
It is an injection containing medroxyprogesterone, a contraceptive injection for women that contains the hormone progestin

How it works Depo provera injection

Prevents the […]

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Environmental Health: Air pollution

By garikaib|2025-02-12T09:07:53+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Smog in China. Image credit ctvnews.ca ZIMSEC O Level Combined Science Notes: Environmental Health: Air pollution

Urban and industrial areas in Zimbabwe produce waste gases which enter the atmosphere
Often these gases are toxic and contain a high level of smoke particles
A thick haze […]

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Light and photosynthesis

By garikaib|2025-02-12T09:39:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Potted plant. Image credit hotstyledesign.com ZIMSEC O Level Combined Science: The test for starch

Aim: To test whether light is required for the photosynthesis process.

Materials

A potted plant, cardboard or aluminum foil, scissors, paper clips or tape, equipment for the start test.

Method Image credit [...]
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Kupatsanura Zviito

By garikaib|2025-02-12T09:26:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit necessarywriters.com ZIMSEC O Level Shona Notes: Kupatsanura Zviito

Chiito chega chega chinogona kupatsanurwa tichibuditsa chidumbu chimwe nechimwe chakachiumba.
Zvidimbu izvi zvinonzi zvivakiso kana kuti zvivakazwi.
Chivakazwi chimwe nechichimwe chinenge chiine basa rachinoita pachiito chachinovanikwa.
Pabvunzo dzeShona panogona kuuya mubvunzo unenge uchida kuti iwe upatsanure chiito uchibuditsa zvivakazwi zvinenge zvakachiumba.
Unofanira […]

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February 2025