O Level Science Notes Archives - Page 2 of 33 - Free ZIMSEC & Cambridge Revision Notes

Rusting and Painting
Gallery
Rusting and Painting

Notes, O Level Science Notes, Ordinary Level Notes

Rusting and Painting

By garikaib|2025-02-12T09:39:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Rusting and Painting

Painting is a popular method used to prevent rusting
The structure to be painted is cleaned using an acidic solution
This removes existing rust and dirt
Sand paper/scrubbing material is also used to clean the surface to be painted
The surface is then left to dry
Once it is dry […]

Comments Off

Biogas as a source of energy
Gallery
Biogas as a source of energy

Notes, O Level Science Notes, Ordinary Level Notes

Biogas as a source of energy

By garikaib|2025-02-12T09:06:04+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Biogas as a source of energy

Biogas is the gas that is obtained from fermenting manure and other organic waste
It is a mixture of methane, carbon dioxide and hydrogen sulphide
Cattle manure is commonly used as a waste to feed biogas plants
Small plants have been built in some parts of Zimbabwe

[…]

Comments Off

Conductors and insulators

By garikaib|2025-02-12T09:18:48+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Conductors and Insulators. Image credit sci-toys.com ZIMSEC O Level Combined Science Notes: Conductors and insulators

A conductor is a material that allows electrons to move from one atom to another
Conductors/Conducting materials cannot be charged unless they are held using an insulating material to prevent […]

Comments Off

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 […]

Comments Off

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 […]

Comments Off

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 […]

Comments Off

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 […]

Comments Off

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 […]

Comments Off