If the index crank of a dividing head is turned through one complete revolution and $10$ holes in a $30$ hole circle plate, the workpiece turns thorugh (in degrees)

6

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12

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240

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480

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Solution

The correct option is B $12$
$12$

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Parts of revolution have you turned through if you stand
facing South and turn.

Question 4 (a)

What part of a revolution have you turned through if you stand facing:
East and turn clockwise to face north?

Under the influence of electric field, which of the following statement is true about the movement of electrons and holes in a p-type semiconductor ?

(a) Electron will move towards the positively charged plate through electron holes

(b) Holes will appear to be moving towards the negatively charge plate

(d) Movement of electrons is not related to the movement of holes

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