Q.1) The standard size of masonry brick is –
A) 18 x 8 x 8 cm
B) 19 x 9 x 9 cm
C) 20 x 10 x 10 cm
D) 21 x 11 x 11 cm
Option (B)
Explanation :
As per IS : 1077-1976, the standard sizes of different bricks are :
Standard Brick: 190 mm x 90 mm x 90 mm
Nominal Brick: 230 mm x 110 mm x 70 mm
Jumbo Brick: 230 mm x 110 mm x 110 mm
Half Brick: 190 mm x 90 mm x 40 mm
Bullnose Brick: 190 mm x 90 mm x 90 mm (with rounded corners)
Q.2) The plasticity to mould bricks in suitable shape is contributed by –
A) Alumina
B) Lime
C) Magnesia
D) Silica
Option (A)
Explanation :
Alumina : It helps in binding the materials, improves strength and durability.
Lime : It reduces shrinkage of bricks during during, thereby helps in preventing craacking.
Magnesia : It makes brick enough capable to resist acid environment.
Silica : It helps in giving shape and structure to bricks.
Q.3) The most suitable stone for building piers is –
A) Granite
B) Limestone
C) Marble
D) Sandstone
Option (A)
Q.4) The moisture content in a well seasoned timber is –
A) 5 – 10%
B) 10 – 12%
C) 12 – 15%
D) 30 – 50%
Option (B)
Q.5) Water required per bag of cement is –
A) 7 kg
B) 14 kg
C) 28 kg
D) 35 kg
Option (C)
Q.6) The standard consistency test is done in a :
A) Blaine’s apparatus
B) Le-chatelier’s apparatus
C) Vane apparatus
D) Vicat’s apparatus
Option (D)
Explanation :
Blain’s apparatus : It is a device used to measure particle size or fineness of cement. It measure specific surface area in square centimetre per gram.
Le-chatelier’s apparatus : It is a device used to measure soundness of cement i.e. ability to resist volume changes or expansion.
Vane apparatus : It is a device used to measure the shear strength of soil.
Vicat’s apparatus : It is a device used to measure consistency of cement. It is used determine the initial and final setting times.
Q.7) Which of the following property of Ordinary Portland Cement is improved by the Pozzolana?
A) Bleeding
B) Heat of hydration
C) Permeability
D) Shrinkage
Option (D)
Q.8) Separation of water, sand, cement from a freshly mixed concrete is known as –
A) Bleeding
B) Creeping
C) Segregation
D) Flooding
Option (A)
Explanation :
Bleeding : It occurs due to settling of solid particles in the mix in fresh concrete, where water layer rises to the surface of concrete and forms a layer of water on top.
Creeping : It is a phenomenon in which the concrete deforms slowly under constant loading. This deformation can cause cracking and other forms of damage, and can reduce the overall strength and durability of the concrete.
Segregation : It is a phenomenon in fresh concrete where the solid particles in the mix separate from the liquid binder, resulting in a non-uniform mix. This can occur due to differences in particle size, shape, and density, as well as due to excessive mixing or vibration.
Flooding : It occurs when excess water is added to the mix resulting in too wet and degraded strength and durability.
Q.9) To prevent segregation, the maximum height for placing concrete is –
A) 100 cm
B) 125 cm
C) 150 cm
D) 200 cm
Option (C)
Q.10) Minimum grade of concrete for moderate environmental exposure condition should be –
A) M 25
B) M 30
C) M 15
D) M 20
Option (A)
Explanation :
As per IS : 456 – 2000, minimum grade of concrete for different exposure conditions :
For Plain Concrete :
- Mild – Nil
- Moderate – M15
- Severe – M20
- Very Severe – M20
For Reinforced Concrete :
- Mild – M20
- Moderate – M25
- Severe – M30
- Very Severe – M35
Q.11) Air entrainment in concrete increases –
A) Workability
B) Strength
C) Unit weight
D) None of the above
Option (A)
Explanation :
Tiny air bubbles are purposefully added to concrete during the mixing process in a technique known as air entrainment. These microscopic gaps created by the air bubbles in the concrete can increase its durability and resistance to freeze-thaw cycles.
Q.12) Minimum number of test specimens required for finding the compressive strength of concrete are –
A) 3
B) 5
C) 6
D) 9
Option (A)
Q.13) The test most suitable for concrete of very low workability is –
A) Slump test
B) Compaction factor test
C) Vee-Bee test
D) All of the above
Option (C)
Q.14) The preliminary test is repeated if the difference in compressive strength of three test specimens, exceeds –
A) 5%
B) 10%
C) 8%
D) 15%
Option (D)
Q.15) Transport of concrete by pumps, is done for a distance of –
A) 100 m
B) 200 m
C) 300 m
D) 400 m
Option (D)
Q.16) The most commonly used base for timber painting is –
A) Red lead
B) Zinc white
C) White lead
D) Titanium white
Option (C)
Q.17) Which one of the following is used as a carrier in paint?
A) Almond oil
B) Linseed oil
C) Mustard oil
D) Olive oil
Option (B)
Q.18) Putty is made up of –
A) Red lead and linseed oil
B) Zinc oxide and boiled linseed oil
C) White lead and turpentine
D) Powdered chalk and raw linseed oil
Option (D)
Q.19) Bullet proof glass is made of thick glass sheet and a sandwiched layer of –
A) Steel
B) Stainless steel
C) High strength plastic
D) Chromium plate
Option (C)
Q.20) Los Angeles machines is used to test the aggregate for –
A) Crushing strength
B) Impact value
C) Abrasion resistance
D) Water absorption
Option (C)
Explanation :
Crushing Strength : It is usually determined by applying a compressive load to a specimen until it fails. Crushing strength is the maximum compressive load that a material can bear before it deforms, cracks or fractures.
Impact value : It is the property of material to withstand sudden impact or shock loading.
Abrasion resistance : It is the property of material to resist wear and tear caused by friction.
Water absorption : It is the amount of water that a material can absorb when immersed in water for a specified period of time. This property is usually expressed as a percentage of the material’s weight. Water absorption is an important property of materials used in construction, as it indicates their ability to resist the effects of moisture, such as swelling, cracking, and deterioration.
