The oldest and cheapest Audio-visual aid that is widely accepted in teaching isThe oldest and cheapest Audio-visual aid that is widely accepted in teaching is mcq  given below:

Q. The oldest and cheapest Audio-visual aid that is widely accepted in teaching is

(a) Charts
(b) Chalkboard
(c) Flip cards
(d) PPT

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Ans:(b) Chalkboard  
 

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