In which of the following situations would double floor joists not be needed?

In which of the following situations would double floor joists not be needed?
 
  a. Under floor openings for stairs
  b. Under loadbearing interior walls running perpendicular to the joists
  c. Under heavy objects like whirlpool tubs
  d. Under loadbearing interior walls running parallel to the joists

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[Ques. 2] When installing a built-up beam, the joints should be positioned _____.
 
  a. directly over support columns
  b. as close to the span midpoint as possible
  c. midway between support columns
  d. at eight-foot intervals

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[Ques. 3] When nailing a rim joist to the sill plate, use _____.
 
  a. 8d nails at 8 OC
  b. 16d nails at 18 OC
  c. 8d nails at 6 OC
  d. 16d nails at 12 OC

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[Ques. 4] To check for level of a sill plate, which tool is not typically recommended?
 
  a. An 8 carpenters level
  b. A transit
  c. A builders level
  d. A plumb bob

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[Ques. 5] The level of the buildings floors and walls will be affected if the sill plate is _____.
 
  a. too thick
  b. not level
  c. not plumb
  d. warped or bowed