A screw gauge is used to measure the thickness of a thin sheet. Which statements are correct?

Select all that apply

• Option A

  Using a stack of many identical sheets can reduce the fractional uncertainty in the thickness of one sheet.

• Option B

  Backlash can be reduced by taking the final reading while rotating the screw in the same direction.

• Option C

  A positive zero error must be added to the observed reading.

• Option D

  For LC = p/N, decreasing p while keeping N fixed improves resolution.