Answers

2014-05-22T09:10:37+05:30
First she must find the thickness of 250 papers using vernier calipers. After eliminating the zero error, she should the thickness of the 250 papers by 250 to get the thickness of one paper.
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2014-05-26T11:57:33+05:30
This is an animation to show how we sholud measure the texbook. instead of that screw you should keep the texbook and read the markings

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first you should keep the textbook between the external jaws(jaws which are down) and read the markings that are shown by right down jaw on the scale