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The standard typewriter keyboard layout used throughout the world is

AABCD Keyboard

BQWERTY Keyboard

CPortable Keyboard

DNone of these

Answer:

B. QWERTY Keyboard

Read Explanation:

Magnetic disk is an example of - secondary memory


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The instruction ' by hand ' on an envelope is to be written :
In a Typewriter, main spring is situated in ?
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Rocher Mechanism includes the functioning of the following parts :

(i) Pinion wheel, Escapement wheel

(ii) Escapement wheel, loose dog

(iii) Pinion wheel, Segment slots

(iv) Loose dog, Platen. 

Another name of main spring tension is :