Construction Materials and Building Technology MCQs (Part-10)
Which material is used to prevent concrete from cracking?
A Sand
B Reinforcement
C Steel
D Lime
Reinforcement, typically in the form of steel bars or mesh, is used in concrete to prevent cracking. It provides tensile strength, allowing concrete to handle stress without breaking or deforming.
Which of the following is an example of a green building material?
A Bamboo
B Concrete
C Steel
D PVC
Bamboo is a sustainable material due to its rapid growth rate and strength. It is increasingly used in construction as an eco friendly alternative to wood and steel, especially in developing regions.
What is the main role of cement in concrete?
A Increase strength
B Act as a binder
C Provide thermal insulation
D Add weight
Cement acts as the binder in concrete. When mixed with water, it undergoes a chemical reaction called hydration, forming a hard matrix that holds the aggregates together, providing structural strength.
What is used to improve the strength of mortar?
A Lime
B Sand
C Cement
D Water
Cement is added to mortar to improve its strength and durability. It binds the sand and lime together, providing a solid bond for masonry work such as bricklaying and stone construction.
Which type of steel is commonly used for reinforcement in concrete?
A Carbon steel
B Mild steel
C Stainless steel
D High tensile steel
Mild steel, with low carbon content, is commonly used for reinforcement in concrete. It offers a good balance of strength, flexibility, and cost, making it ideal for construction purposes.
What is the most common use of fly ash in construction?
A As a cement substitute
B Insulation
C Waterproofing
D Reinforcement
Fly ash is commonly used as a partial substitute for cement in concrete. It improves workability, reduces heat of hydration, and enhances durability, while also contributing to sustainability by reducing the need for virgin cement.
What is the function of formwork in concrete?
A To reduce weight
B To provide color
C To support during hardening
D To improve texture
Formwork is a temporary structure used to mold concrete during curing. It supports the concrete until it hardens and gains enough strength to hold its shape independently, ensuring proper form and stability.
Which material is often used for thermal insulation in buildings?
A Clay
B Concrete
C Fiberglass
D Steel
Fiberglass is commonly used for thermal insulation due to its ability to trap air and resist heat flow. It is lightweight, non combustible, and widely used in walls, attics, and ceilings to improve energy efficiency.
What is the purpose of using admixtures in concrete?
A To add color
B To increase workability
C To reduce cost
D To increase weight
Admixtures are used in concrete to modify its properties, such as increasing workability, reducing water content, speeding up setting time, or improving strength. They allow for better performance under various environmental conditions.
What is the most common use of concrete blocks?
A Wall construction
B Insulation
C Roofing
D Flooring
Concrete blocks are commonly used for wall construction due to their durability, strength, and ease of use. They provide a solid foundation for building structures and offer good resistance to weather and fire.
What type of cement is used in the construction of seawalls?
A Ordinary Portland Cement
B White Cement
C Rapid Hardening Cement
D Sulphate Resistant Cement
Sulphate Resistant Cement is used in construction exposed to seawater because it resists the chemical attacks of sulphates, which are commonly found in marine environments. This ensures long term durability in seawalls.
What is the purpose of reinforcement detailing in concrete structures?
A To speed up construction
B To reduce cost
C To ensure proper steel placement
D To increase aesthetic appeal
Reinforcement detailing ensures the correct placement, spacing, and size of steel bars within concrete. This is crucial for maintaining the structural integrity and safety of the building under stress and load.
Which of the following is a non conventional material used in construction?
A Concrete
B Bamboo
C Timber
D Steel
Bamboo is considered a non conventional material in construction due to its high strength to weight ratio, rapid growth, and sustainability. It is used in scaffolding, flooring, and lightweight structures in some regions.
What is the primary use of lime in construction?
A Mortar and plaster
B Insulation
C Waterproofing
D Reinforcement
Lime is commonly used in mortar and plaster due to its ability to bond well with aggregates and its workability. It also offers flexibility and breathability, making it ideal for masonry and wall finishes.
Which of the following is a characteristic of high strength concrete?
A High water content
B Low water cement ratio
C High cost
D Low durability
High strength concrete typically has a low water cement ratio, which improves its compressive strength. This mixture leads to denser concrete that can withstand higher stresses and is more durable under harsh conditions.