1. The material used to reduce friction and wear in bearings is called:
A. Concrete
B. Lubricant
C. Asphalt
D. Aggregate
Answer: B) Lubricant
Rationale: Lubricants are used in bearings to reduce friction, wear, and heat, ensuring smooth
operation and longevity of machinery.
2. What is the purpose of using a water-cement ratio in concrete mix design?
A. To determine the compressive strength
B. To ensure the right amount of water for hydration
C. To control the weight of concrete
D. To adjust the workability of the concrete
Answer: B) To ensure the right amount of water for hydration
Rationale: The water-cement ratio is critical to ensure sufficient water is available for the
hydration of cement, which is necessary for achieving the desired strength of concrete.
3. A cantilever is a structural element that is supported at:
,A. Both ends
B. One end only
C. No ends
D. The middle
Answer: B) One end only
Rationale: A cantilever is a structural element that is supported at one end and extends beyond its
support without any additional support on the other end. This is commonly seen in bridges and
balconies.
4. In reinforced concrete, what is the role of steel reinforcement?
A. To add aesthetic value
B. To increase thermal resistance
C. To resist tensile stresses
D. To prevent water ingress
Answer: C) To resist tensile stresses
Rationale: Steel reinforcement in reinforced concrete is used to resist tensile stresses (pulling
forces), as concrete is strong in compression but weak in tension.
5. Which of the following is the primary advantage of pre-stressed concrete?
A. High initial cost
B. It is lightweight
, C. Increased strength and load-carrying capacity
D. It is easier to handle
Answer: C) Increased strength and load-carrying capacity
Rationale: Pre-stressed concrete offers increased strength and load-carrying capacity because the
concrete is subjected to tension before being loaded, allowing it to resist higher forces.
6. Which type of concrete is used for underwater construction?
A. Ordinary Portland Cement
B. Air-entrained concrete
C. Rapid hardening concrete
D. Waterproof concrete
Answer: D) Waterproof concrete
Rationale: Waterproof concrete is used in underwater construction because it resists water
penetration and can withstand the challenging conditions of underwater environments.
7. Which of the following is the primary use of lime in construction?
A. To make mortar and plaster
B. To make bricks
C. To create insulation
D. To make cement
Answer: A) To make mortar and plaster
A. Concrete
B. Lubricant
C. Asphalt
D. Aggregate
Answer: B) Lubricant
Rationale: Lubricants are used in bearings to reduce friction, wear, and heat, ensuring smooth
operation and longevity of machinery.
2. What is the purpose of using a water-cement ratio in concrete mix design?
A. To determine the compressive strength
B. To ensure the right amount of water for hydration
C. To control the weight of concrete
D. To adjust the workability of the concrete
Answer: B) To ensure the right amount of water for hydration
Rationale: The water-cement ratio is critical to ensure sufficient water is available for the
hydration of cement, which is necessary for achieving the desired strength of concrete.
3. A cantilever is a structural element that is supported at:
,A. Both ends
B. One end only
C. No ends
D. The middle
Answer: B) One end only
Rationale: A cantilever is a structural element that is supported at one end and extends beyond its
support without any additional support on the other end. This is commonly seen in bridges and
balconies.
4. In reinforced concrete, what is the role of steel reinforcement?
A. To add aesthetic value
B. To increase thermal resistance
C. To resist tensile stresses
D. To prevent water ingress
Answer: C) To resist tensile stresses
Rationale: Steel reinforcement in reinforced concrete is used to resist tensile stresses (pulling
forces), as concrete is strong in compression but weak in tension.
5. Which of the following is the primary advantage of pre-stressed concrete?
A. High initial cost
B. It is lightweight
, C. Increased strength and load-carrying capacity
D. It is easier to handle
Answer: C) Increased strength and load-carrying capacity
Rationale: Pre-stressed concrete offers increased strength and load-carrying capacity because the
concrete is subjected to tension before being loaded, allowing it to resist higher forces.
6. Which type of concrete is used for underwater construction?
A. Ordinary Portland Cement
B. Air-entrained concrete
C. Rapid hardening concrete
D. Waterproof concrete
Answer: D) Waterproof concrete
Rationale: Waterproof concrete is used in underwater construction because it resists water
penetration and can withstand the challenging conditions of underwater environments.
7. Which of the following is the primary use of lime in construction?
A. To make mortar and plaster
B. To make bricks
C. To create insulation
D. To make cement
Answer: A) To make mortar and plaster
