Hi Bhat,
AXIS:
It is said to be an imaginary line along which a body rotates.
A fan rotates around it's axis.
AXIS OF ROTATION:
It is a straight line through all fixed points of a rotating rigid body around which all other points of the body move in circles.
It can lie outside a body too.
Question : When there is an advancement of technology in respect of both the goods it is known as
Option 1: Rightward shift in PPF
Option 2: Leftward shift in PPF
Option 3: Rotation on X axis
Option 4: Rotation of Y axis
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