If i prepare a drawing in A3 paper size,can i plot it in A1 or A0 or A2 paper size?The sizes of arrow,text size etc in dimensions will be changed?

Use annotative dimensions, Text styles, Hatch etc...

Since AutoCAD 2008, we can automate the sizing of annotation, such as text and dimensions, in multiple viewports with varying scales. In this tutorial, you practice using this feature, called annotative objects.

The following objects can be annotative, meaning that they can size automatically:

• Text (single-line text)
• Mtext (multi-line text)
• Dimensions
• Multileaders (which are new for AutoCAD 2008)
• Tolerances (in frames)
• Hatches
• Blocks
• Block attributes

of course, it will be changed............you have to use scale option......otherwise..........new guy wouldn't understand.....

yes,but you will get some blur in picture

 It will be remain unchange.

Yes,  you just change the size of the paper accordingly, check the button for fit to paper and center plot and apply to plot.

Yes you can plot. But you have to choose the limits or window to plot .

All the text ,arrow  size and dimensions all will be the same