21. What is the term used to describe the process of improving or upgrading existing buildings or infrastructure?
a) Remodeling
b) Renovation
c) Retrofitting
d) Refurbishment
22. Which type of construction project involves the construction of office buildings, retail spaces, and hotels?
a) Residential construction
b) Commercial construction
c) Industrial construction
d) Civil construction
23. What is the term used to describe the vertical division of a building into separate floors or levels?
a) Foundation
b) Framing
c) Floor plan
d) Story
24. Which of the following is NOT a commonly used construction equipment?
a) Excavator
b) Crane
c) Bulldozer
d) Roller coaster
25. What is the term used to describe the process of joining two pieces of material together using heat or pressure?
a) Welding
b) Bolting
c) Gluing
d) Nailing
