alleryWhy do lecture theatres use several blackboards in a grid?
ATo cut down chalk use
BTo hide old writing
CTo show much at once
DTo reduce room noise
Answer & Solution
Correct answer: C. To show much at once
1. Boards are moved into and out of the lecturer's reach.
2. This lets a large amount of material be shown at the same time.
3. Chalk saving, hiding and noise are not the purpose.
_Source: Wikipedia, Blackboard, Design_
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