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NASCLA Commercial General Building Contractor — Practice Exam

Site construction: earthwork: practice questions

Our NASCLA Commercial GC bank has 12 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

A rod reading on a benchmark of elevation 100.00 ft is 4.50 ft, and the reading on a point is 6.25 ft. What is the point's elevation?

  1. 98.25 ft
  2. 101.75 ft
  3. 104.50 ft
  4. 110.75 ft
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A. 98.25 ft — Height of instrument 104.50 − 6.25 = 98.25.

Question 2

100 bank cubic yards of soil has a 25% swell. How many loose cubic yards must be hauled?

  1. 75 loose cubic yards
  2. 100 loose cubic yards
  3. 125 loose cubic yards
  4. 250 loose cubic yards
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C. 125 loose cubic yards — 100 × 1.25.

Question 3

What is a benchmark in site surveying?

  1. The center of the building
  2. A fixed point of known elevation
  3. The property's corner pin set by the surveyor
  4. A temporary fence post
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B. A fixed point of known elevation — Elevations on site are carried from it.

Question 4

What is 'swell' in earthwork?

  1. The increase in soil volume when it is excavated and loosened
  2. The height of a fill above grade
  3. Water absorbed by clay after rain
  4. The decrease in soil volume when it is compacted in thin lifts
Show the answer

A. The increase in soil volume when it is excavated and loosened — Loose volume = bank volume × (1 + swell).

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