CPC CPC Construction Methods & Materials 2

Question 1

What does the water-cement (w/c) ratio primarily control in a concrete mix design?

Accepted Answer

Strength and durability

Answer

Color and texture

Answer

Workability only

Answer

Aggregate gradation

Question 2

In post-tensioned concrete construction, when are the tendons typically stressed?

Accepted Answer

After concrete has reached sufficient strength

Answer

Before concrete is placed

Answer

During concrete placement

Answer

Seven days before pouring

Question 3

Which type of formwork system uses large prefabricated panels that can be reused many times on repetitive floor plates?

Accepted Answer

Flying form (table form) system

Answer

Stick-built formwork

Answer

Single-use stay-in-place forms

Answer

Earthen formwork

Question 4

What is the primary function of a vapor retarder placed under a concrete slab-on-grade?

Accepted Answer

Prevent moisture migration from soil into the slab

Answer

Improve concrete bond to subbase

Answer

Increase load-bearing capacity

Answer

Provide thermal insulation

Question 5

In structural steel erection, what is the purpose of a 'safety cable' installed between columns?

Accepted Answer

Provide fall protection for ironworkers walking on beams

Answer

Align columns during grouting

Answer

Tension the connection bolts

Answer

Support the crane load line

Question 6

Which soil improvement technique involves injecting a grout mixture into loose granular soil to densify and strengthen it?

Accepted Answer

Compaction grouting

Answer

Surcharge preloading

Answer

Dewatering

Answer

Dynamic compaction