47C 47C Reinforced Concrete Codes Practice Exam
Question 1: What is the primary purpose of reinforced concrete in construction?
A) To reduce construction costs
B) To combine the high compressive strength of concrete with the tensile strength of steel
C) To enhance the aesthetic appeal of structures
D) To increase thermal insulation
Correct Answer: B
Explanation: Reinforced concrete is designed to take advantage of concrete’s compressive strength and
steel’s tensile strength, making structures more durable and efficient.
Question 2: Which term defines the resistance of concrete to external loads?
A) Reinforcement
B) Ductility
C) Strength
D) Flexibility
Correct Answer: C
Explanation: Concrete strength refers to its ability to withstand loads, particularly in compression, which
is a fundamental property in design codes.
Question 3: Which international code is widely used for reinforced concrete design?
A) ACI
B) ISO
C) ASTM
D) IEEE
Correct Answer: A
Explanation: The American Concrete Institute (ACI) codes are among the most widely recognized and
used standards for reinforced concrete design.
Question 4: In reinforced concrete, what is the main function of reinforcement steel?
A) To reduce the weight of the structure
B) To provide tensile strength and control cracking
C) To act as a decorative element
D) To accelerate curing
Correct Answer: B
Explanation: Reinforcement steel enhances the tensile strength of concrete and helps control cracking,
making it essential for structural integrity.
Question 5: Which component is NOT part of the typical composition of concrete?
A) Cement
B) Aggregates
C) Water
D) Plasticizer as a primary binder
Correct Answer: D
Explanation: While plasticizers are used as admixtures, the primary binder in concrete is cement;
plasticizers are added to improve workability.
,Question 6: What is the term used to describe the time-dependent gain in strength of concrete?
A) Workability
B) Curing
C) Slump
D) Plasticity
Correct Answer: B
Explanation: Curing is the process through which concrete gains strength over time due to ongoing
hydration of the cement.
Question 7: Which of the following is a high-strength reinforcement bar?
A) Mild steel bar
B) Deformed bar
C) Cold-formed bar
D) Alloyed deformed bar
Correct Answer: D
Explanation: Alloyed deformed bars are designed for high-strength applications, offering superior
performance compared to mild steel.
Question 8: What property primarily affects the bond between steel and concrete?
A) Bar diameter
B) Concrete color
C) Surface deformation of the steel
D) Cement brand
Correct Answer: C
Explanation: The surface deformation (or rib pattern) on steel bars improves the mechanical bond
between the steel and concrete.
Question 9: What does “development length” refer to in reinforcement detailing?
A) The total length of the reinforcement bar
B) The minimum length of bar embedment needed to develop the steel’s full strength
C) The spacing between reinforcing bars
D) The length of the lap splice
Correct Answer: B
Explanation: Development length is the required embedment length that ensures the bar develops its
full tensile strength in concrete.
Question 10: Which admixture is used to improve the workability of concrete without increasing
water content?
A) Accelerators
B) Retarders
C) Plasticizers
D) Air-entraining agents
Correct Answer: C
Explanation: Plasticizers enhance the workability of concrete by reducing water demand while
maintaining strength.
,Question 11: In concrete mix design, what is the main objective of proportioning the ingredients?
A) To achieve a desired color
B) To balance workability, strength, and durability
C) To minimize curing time
D) To enhance the acoustic properties
Correct Answer: B
Explanation: Mix proportioning ensures that the concrete mix meets the required performance criteria
for workability, strength, and durability.
Question 12: What method is commonly used in the United States for concrete mix design?
A) BS mix design
B) IS mix design
C) ACI mix design
D) Eurocode mix design
Correct Answer: C
Explanation: The ACI mix design method is widely used in the United States to achieve desired concrete
properties.
Question 13: Which concrete property is most directly affected by curing conditions?
A) Density
B) Compressive strength
C) Thermal conductivity
D) Color consistency
Correct Answer: B
Explanation: Proper curing directly influences the hydration process, which in turn affects the
compressive strength of concrete.
Question 14: What type of load is considered when designing for live load in a structure?
A) Dead load from the structure’s self-weight
B) Temporary loads such as occupancy and furniture
C) Wind load
D) Seismic load
Correct Answer: B
Explanation: Live loads are temporary and variable loads, such as those from people and movable
objects, that a structure must safely support.
Question 15: Which of the following is a primary factor in the analysis of bending moments in
reinforced concrete beams?
A) Temperature variation
B) Span length and loading conditions
C) Curing time
D) Concrete color
Correct Answer: B
Explanation: Bending moments in beams depend largely on the span length and the applied loads, which
are key considerations in design.
, Question 16: What does the term “shear force” refer to in structural analysis?
A) The force that causes bending
B) The internal force parallel to the section plane
C) The compressive force in a column
D) The tensile force in reinforcement
Correct Answer: B
Explanation: Shear force is an internal force that acts parallel to the cross-sectional plane of a member,
causing potential sliding failure.
Question 17: Which of the following best describes serviceability limits in concrete design?
A) Maximum load capacity before collapse
B) Criteria related to deflection, cracking, and vibration
C) The ultimate strength of concrete
D) The chemical composition limits of concrete
Correct Answer: B
Explanation: Serviceability limits ensure that a structure remains functional and comfortable for
occupants by controlling deflections, cracks, and vibrations.
Question 18: What is the significance of safety factors in reinforced concrete design?
A) They eliminate the need for quality control
B) They account for uncertainties in loads and material properties
C) They determine the aesthetic finish
D) They are used solely for seismic design
Correct Answer: B
Explanation: Safety factors provide a margin of safety by accounting for potential variations in loads,
material properties, and construction practices.
Question 19: In beam design, what is the primary purpose of transverse reinforcement?
A) To support the overall weight of the structure
B) To resist shear forces
C) To improve the beam’s appearance
D) To enhance concrete curing
Correct Answer: B
Explanation: Transverse reinforcement, such as stirrups, is primarily used to resist shear forces and
prevent diagonal cracking in beams.
Question 20: What does the term “continuous beam” refer to in reinforced concrete design?
A) A beam with no reinforcement
B) A beam that spans over more than two supports
C) A beam with pre-applied loads
D) A beam used only in slabs
Correct Answer: B
Explanation: A continuous beam extends over multiple supports, which requires careful analysis of
moments and shear at various spans.
Question 21: Which factor is critical when designing reinforcement placement in a beam?
A) The color of the reinforcement
Question 1: What is the primary purpose of reinforced concrete in construction?
A) To reduce construction costs
B) To combine the high compressive strength of concrete with the tensile strength of steel
C) To enhance the aesthetic appeal of structures
D) To increase thermal insulation
Correct Answer: B
Explanation: Reinforced concrete is designed to take advantage of concrete’s compressive strength and
steel’s tensile strength, making structures more durable and efficient.
Question 2: Which term defines the resistance of concrete to external loads?
A) Reinforcement
B) Ductility
C) Strength
D) Flexibility
Correct Answer: C
Explanation: Concrete strength refers to its ability to withstand loads, particularly in compression, which
is a fundamental property in design codes.
Question 3: Which international code is widely used for reinforced concrete design?
A) ACI
B) ISO
C) ASTM
D) IEEE
Correct Answer: A
Explanation: The American Concrete Institute (ACI) codes are among the most widely recognized and
used standards for reinforced concrete design.
Question 4: In reinforced concrete, what is the main function of reinforcement steel?
A) To reduce the weight of the structure
B) To provide tensile strength and control cracking
C) To act as a decorative element
D) To accelerate curing
Correct Answer: B
Explanation: Reinforcement steel enhances the tensile strength of concrete and helps control cracking,
making it essential for structural integrity.
Question 5: Which component is NOT part of the typical composition of concrete?
A) Cement
B) Aggregates
C) Water
D) Plasticizer as a primary binder
Correct Answer: D
Explanation: While plasticizers are used as admixtures, the primary binder in concrete is cement;
plasticizers are added to improve workability.
,Question 6: What is the term used to describe the time-dependent gain in strength of concrete?
A) Workability
B) Curing
C) Slump
D) Plasticity
Correct Answer: B
Explanation: Curing is the process through which concrete gains strength over time due to ongoing
hydration of the cement.
Question 7: Which of the following is a high-strength reinforcement bar?
A) Mild steel bar
B) Deformed bar
C) Cold-formed bar
D) Alloyed deformed bar
Correct Answer: D
Explanation: Alloyed deformed bars are designed for high-strength applications, offering superior
performance compared to mild steel.
Question 8: What property primarily affects the bond between steel and concrete?
A) Bar diameter
B) Concrete color
C) Surface deformation of the steel
D) Cement brand
Correct Answer: C
Explanation: The surface deformation (or rib pattern) on steel bars improves the mechanical bond
between the steel and concrete.
Question 9: What does “development length” refer to in reinforcement detailing?
A) The total length of the reinforcement bar
B) The minimum length of bar embedment needed to develop the steel’s full strength
C) The spacing between reinforcing bars
D) The length of the lap splice
Correct Answer: B
Explanation: Development length is the required embedment length that ensures the bar develops its
full tensile strength in concrete.
Question 10: Which admixture is used to improve the workability of concrete without increasing
water content?
A) Accelerators
B) Retarders
C) Plasticizers
D) Air-entraining agents
Correct Answer: C
Explanation: Plasticizers enhance the workability of concrete by reducing water demand while
maintaining strength.
,Question 11: In concrete mix design, what is the main objective of proportioning the ingredients?
A) To achieve a desired color
B) To balance workability, strength, and durability
C) To minimize curing time
D) To enhance the acoustic properties
Correct Answer: B
Explanation: Mix proportioning ensures that the concrete mix meets the required performance criteria
for workability, strength, and durability.
Question 12: What method is commonly used in the United States for concrete mix design?
A) BS mix design
B) IS mix design
C) ACI mix design
D) Eurocode mix design
Correct Answer: C
Explanation: The ACI mix design method is widely used in the United States to achieve desired concrete
properties.
Question 13: Which concrete property is most directly affected by curing conditions?
A) Density
B) Compressive strength
C) Thermal conductivity
D) Color consistency
Correct Answer: B
Explanation: Proper curing directly influences the hydration process, which in turn affects the
compressive strength of concrete.
Question 14: What type of load is considered when designing for live load in a structure?
A) Dead load from the structure’s self-weight
B) Temporary loads such as occupancy and furniture
C) Wind load
D) Seismic load
Correct Answer: B
Explanation: Live loads are temporary and variable loads, such as those from people and movable
objects, that a structure must safely support.
Question 15: Which of the following is a primary factor in the analysis of bending moments in
reinforced concrete beams?
A) Temperature variation
B) Span length and loading conditions
C) Curing time
D) Concrete color
Correct Answer: B
Explanation: Bending moments in beams depend largely on the span length and the applied loads, which
are key considerations in design.
, Question 16: What does the term “shear force” refer to in structural analysis?
A) The force that causes bending
B) The internal force parallel to the section plane
C) The compressive force in a column
D) The tensile force in reinforcement
Correct Answer: B
Explanation: Shear force is an internal force that acts parallel to the cross-sectional plane of a member,
causing potential sliding failure.
Question 17: Which of the following best describes serviceability limits in concrete design?
A) Maximum load capacity before collapse
B) Criteria related to deflection, cracking, and vibration
C) The ultimate strength of concrete
D) The chemical composition limits of concrete
Correct Answer: B
Explanation: Serviceability limits ensure that a structure remains functional and comfortable for
occupants by controlling deflections, cracks, and vibrations.
Question 18: What is the significance of safety factors in reinforced concrete design?
A) They eliminate the need for quality control
B) They account for uncertainties in loads and material properties
C) They determine the aesthetic finish
D) They are used solely for seismic design
Correct Answer: B
Explanation: Safety factors provide a margin of safety by accounting for potential variations in loads,
material properties, and construction practices.
Question 19: In beam design, what is the primary purpose of transverse reinforcement?
A) To support the overall weight of the structure
B) To resist shear forces
C) To improve the beam’s appearance
D) To enhance concrete curing
Correct Answer: B
Explanation: Transverse reinforcement, such as stirrups, is primarily used to resist shear forces and
prevent diagonal cracking in beams.
Question 20: What does the term “continuous beam” refer to in reinforced concrete design?
A) A beam with no reinforcement
B) A beam that spans over more than two supports
C) A beam with pre-applied loads
D) A beam used only in slabs
Correct Answer: B
Explanation: A continuous beam extends over multiple supports, which requires careful analysis of
moments and shear at various spans.
Question 21: Which factor is critical when designing reinforcement placement in a beam?
A) The color of the reinforcement
