1. Blackboards and chalk
Blackboard is one of the very old and most used teaching aids in the schools. Recently blackboards have been changed to green boards, but the basic function of the board remains the same by whatever colour one may name it. Even the material used for making the blackboards is changed from the ordinary wood to the most sophisticated plastic, fiber and glass materials of today. In some classrooms, the blackboards are permanently made of cement and mortar. But the functions of all these are the same. The blackboard has been the most handy and useful tool of a teacher in the classroom.
The teacher has to take a white chalk to describe the things on the blackboard or for writing the notes of lesson on it for the children to copy. Coloured pieces of chalk are also used to emphasize upon the important parts of the lesson.
2. Over Head Projectors (OHP)
It supports mass instruction; it has replaced the chalkboard though it is not available in most schools due to electricity and costs of production
marto answered the question on October 3, 2019 at 08:27
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