DM G+1 EXAM ACCURATE REAL EXAM QUESTIONS AND VERIFIED
ANSWERS WITH DETAILED RATIONALES EACH | CURRENTLY TESTING
AND FREQUENTLY TESTED QUESTIONS |
GRADED A+
SECTION 1: CONCRETE TECHNOLOGY AND MATERIALS (Questions 1-40)
1. The shutters and bottom support of a non-cantilever slab can be removed
within a minimum of how many days?
A) 7 days
B) 14 days
C) 21 days
D) 28 days
Answer: B
Rationale: According to Dubai Municipality standards and general construction
practice, the formwork and bottom supports for non-cantilever slabs can be
removed after a minimum of 14 days, provided the concrete has achieved
adequate strength. This allows sufficient time for the concrete to gain strength
and support its own weight.
2. The shutters and bottom support of a non-cantilever beam can be removed
within a minimum of how many days?
A) 7 days
B) 14 days
C) 21 days
D) 28 days
Answer: B
Rationale: For non-cantilever beams, the formwork removal time is similar to
slabs — a minimum of 14 days. The beam must have developed sufficient
strength to carry its own weight and any construction loads.
3. Shotcrete is used in which of the following applications?
A) Repairing surfaces
B) Dam surfaces
1
,C) Curved surfaces
D) All of the above
Answer: D
Rationale: Shotcrete (sprayed concrete) is a versatile material used in repairing
damaged surfaces, constructing dam surfaces, and creating curved surfaces. Its
ability to be applied to vertical and overhead surfaces makes it ideal for these
applications.
4. Bitumen is used in construction to provide:
A) Protective Surface
B) Shining surface
C) Decorative surface
D) All of above
Answer: A
Rationale: Bitumen is primarily used as a protective surface in construction,
especially in waterproofing and road construction. It provides a durable,
waterproof layer that protects structures from moisture and environmental
damage.
5. The first test on concrete is typically done after how many days?
A) 3 days
B) 7 days
C) 14 days
D) 28 days
Answer: B
Rationale: The first compressive strength test on concrete is typically conducted
after 7 days of curing. This provides an early indication of whether the concrete
will achieve its specified 28-day strength.
6. Core samples are taken from concrete structures for finding:
A) Tensile strength
B) Compressive strength
2
,C) Water absorption
D) Surface hardness
Answer: B
Rationale: Core samples are extracted from hardened concrete structures
primarily to determine the compressive strength of the in-place concrete. This is a
common method for assessing the quality and structural integrity of existing
concrete.
7. The Rebound Schmidt hammer test is classified as:
A) Destructive test
B) Non-destructive test
C) Cohesion test
D) All of above
Answer: B
Rationale: The Schmidt hammer (rebound hammer) test is a non-destructive test
used to estimate the compressive strength of concrete. It measures the rebound
of a spring-loaded mass impacting the concrete surface, providing a quick and
easy assessment.
8. Core samples are typically taken after how many days?
A) 7 days
B) 14 days
C) 28 days
D) 10 days
Answer: C
Rationale: Core samples are usually taken after 28 days of curing, as this is the
standard age at which concrete's compressive strength is evaluated. This allows
for a fair comparison with the standard 28-day cube test results.
9. The density of Aluminium is approximately _____ Kg/m3 at normal
temperature.
3
, A) 2500
B) 2700
C) 3500
D) 7800
Answer: B
Rationale: The density of aluminum is approximately 2700 kg/m³. This is
significantly lower than steel (around 7800 kg/m³), making aluminum a
lightweight material suitable for various construction applications.
10. Adding more water to a concrete mix will:
A) Decrease workability
B) Remain same
C) Increase workability
D) No effect
Answer: C
Rationale: Adding more water to a concrete mix increases its workability by
reducing the viscosity of the cement paste. However, this comes at the cost of
reduced strength and durability, as the water-cement ratio increases.
11. The density of AAC (Autoclaved Aerated Concrete) blocks is approximately
_____ Kg/m3.
A) 500
B) 600
C) 700
D) 800
Answer: B
Rationale: AAC blocks have a density of approximately 600 kg/m³. Their
lightweight nature makes them easy to handle and provides excellent thermal
insulation properties.
12. Compaction of concrete is done to:
A) Increase strength
4
ANSWERS WITH DETAILED RATIONALES EACH | CURRENTLY TESTING
AND FREQUENTLY TESTED QUESTIONS |
GRADED A+
SECTION 1: CONCRETE TECHNOLOGY AND MATERIALS (Questions 1-40)
1. The shutters and bottom support of a non-cantilever slab can be removed
within a minimum of how many days?
A) 7 days
B) 14 days
C) 21 days
D) 28 days
Answer: B
Rationale: According to Dubai Municipality standards and general construction
practice, the formwork and bottom supports for non-cantilever slabs can be
removed after a minimum of 14 days, provided the concrete has achieved
adequate strength. This allows sufficient time for the concrete to gain strength
and support its own weight.
2. The shutters and bottom support of a non-cantilever beam can be removed
within a minimum of how many days?
A) 7 days
B) 14 days
C) 21 days
D) 28 days
Answer: B
Rationale: For non-cantilever beams, the formwork removal time is similar to
slabs — a minimum of 14 days. The beam must have developed sufficient
strength to carry its own weight and any construction loads.
3. Shotcrete is used in which of the following applications?
A) Repairing surfaces
B) Dam surfaces
1
,C) Curved surfaces
D) All of the above
Answer: D
Rationale: Shotcrete (sprayed concrete) is a versatile material used in repairing
damaged surfaces, constructing dam surfaces, and creating curved surfaces. Its
ability to be applied to vertical and overhead surfaces makes it ideal for these
applications.
4. Bitumen is used in construction to provide:
A) Protective Surface
B) Shining surface
C) Decorative surface
D) All of above
Answer: A
Rationale: Bitumen is primarily used as a protective surface in construction,
especially in waterproofing and road construction. It provides a durable,
waterproof layer that protects structures from moisture and environmental
damage.
5. The first test on concrete is typically done after how many days?
A) 3 days
B) 7 days
C) 14 days
D) 28 days
Answer: B
Rationale: The first compressive strength test on concrete is typically conducted
after 7 days of curing. This provides an early indication of whether the concrete
will achieve its specified 28-day strength.
6. Core samples are taken from concrete structures for finding:
A) Tensile strength
B) Compressive strength
2
,C) Water absorption
D) Surface hardness
Answer: B
Rationale: Core samples are extracted from hardened concrete structures
primarily to determine the compressive strength of the in-place concrete. This is a
common method for assessing the quality and structural integrity of existing
concrete.
7. The Rebound Schmidt hammer test is classified as:
A) Destructive test
B) Non-destructive test
C) Cohesion test
D) All of above
Answer: B
Rationale: The Schmidt hammer (rebound hammer) test is a non-destructive test
used to estimate the compressive strength of concrete. It measures the rebound
of a spring-loaded mass impacting the concrete surface, providing a quick and
easy assessment.
8. Core samples are typically taken after how many days?
A) 7 days
B) 14 days
C) 28 days
D) 10 days
Answer: C
Rationale: Core samples are usually taken after 28 days of curing, as this is the
standard age at which concrete's compressive strength is evaluated. This allows
for a fair comparison with the standard 28-day cube test results.
9. The density of Aluminium is approximately _____ Kg/m3 at normal
temperature.
3
, A) 2500
B) 2700
C) 3500
D) 7800
Answer: B
Rationale: The density of aluminum is approximately 2700 kg/m³. This is
significantly lower than steel (around 7800 kg/m³), making aluminum a
lightweight material suitable for various construction applications.
10. Adding more water to a concrete mix will:
A) Decrease workability
B) Remain same
C) Increase workability
D) No effect
Answer: C
Rationale: Adding more water to a concrete mix increases its workability by
reducing the viscosity of the cement paste. However, this comes at the cost of
reduced strength and durability, as the water-cement ratio increases.
11. The density of AAC (Autoclaved Aerated Concrete) blocks is approximately
_____ Kg/m3.
A) 500
B) 600
C) 700
D) 800
Answer: B
Rationale: AAC blocks have a density of approximately 600 kg/m³. Their
lightweight nature makes them easy to handle and provides excellent thermal
insulation properties.
12. Compaction of concrete is done to:
A) Increase strength
4
