FREE General Contractor License Site Work and Concrete Questions and Answers

Question 1

A competent person inspects an excavation and classifies the soil as Type C. According to OSHA standards for excavations 20 feet or less in depth, what is the maximum allowable simple slope?

Accepted Answer

1 ½ horizontal to 1 vertical (1½:1)

Answer

3/4 horizontal to 1 vertical (3/4:1)

Answer

1 horizontal to 1 vertical (1:1)

Answer

Vertical (90 degrees)

Question 2

During a concrete slump test (ASTM C143), the fresh concrete is placed into the cone in three equal layers by volume. How many times should each layer be rodded?

Accepted Answer

25 times

Answer

10 times

Answer

30 times

Answer

15 times

Question 3

A contractor is preparing to place a 6-inch thick concrete slab on grade. To ensure the rebar provides the intended tensile strength and is protected from corrosion, it must be positioned correctly within the slab. What is the primary purpose of using rebar chairs or bolsters during this process?

Accepted Answer

To maintain the proper concrete cover over the reinforcement.

Answer

To electrically ground the rebar grid.

Answer

To help the concrete cure more evenly.

Answer

To tie intersecting rebar pieces together.

Question 4

Which of the following best describes the primary goal of concrete curing?

Accepted Answer

To maintain satisfactory moisture and temperature conditions.

Answer

To accelerate the drying of the concrete surface.

Answer

To remove excess water from the concrete mix.

Answer

To increase the surface hardness for better wear resistance.

Question 5

A laboratory soil analysis, known as a Proctor test (ASTM D698), is performed on a soil sample from a job site. What is the primary purpose of this test?

Accepted Answer

To establish the optimal moisture content for maximum compaction.

Answer

To determine the soil's permeability and water drainage characteristics.

Answer

To identify the unconfined compressive strength for excavation sloping.

Answer

To classify the soil's organic and mineral content.

Question 6

During a slump test, the concrete subsides, but one side shears off and falls away from the main mass of the concrete. According to ASTM C143, what should be done?

Accepted Answer

Disregard the test and perform another test on a new sample.

Answer

Measure the slump at the highest remaining point.

Answer

Average the height of the sheared portion and the main portion.

Answer

Record the result as a 'shear slump' and accept the concrete.

A competent person inspects an excavation and classifies the soil as Type C.According to OSHA standards for excavations 20 feet or less in depth, what is the maximum allowable simple slope?

A competent person inspects an excavation and classifies the soil as Type C.
According to OSHA standards for excavations 20 feet or less in depth, what is the maximum allowable simple slope?