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Sample VETA Masonry and Bricklaying CBA Practice Questions
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1Which binder hardens through hydration when mixed with water in ordinary cement mortar and concrete?
A.Portland cement
B.Air lime alone
C.Bituminous paint
D.Dry sand alone
Explanation: Portland cement reacts chemically with water to form binding hydration products. Sand and coarse aggregate provide the granular skeleton but do not replace that binder.
2Which site check can indicate excessive fine silt in a sand sample, while leaving formal acceptance to the applicable specification and tests?
A.Concrete slump test
B.Sedimentation jar test
C.Cement setting-time test
D.Hardened concrete rebound test
Explanation: A jar sedimentation test separates a sand sample into visible layers and can indicate fine contamination. It is a screening method; it does not establish every property of the sand or detect all harmful organic substances.
3A mortar batch requires 8 buckets of sand measured in its unbulked condition. A site test shows that this damp sand occupies 25% more volume for the same amount of sand. How many buckets of the damp sand provide the required quantity?
A.6 buckets
B.8 buckets
C.10 buckets
D.12 buckets
Explanation: Bulking increases the measured volume without increasing the amount of sand. The corrected volume is 8 × 1.25 = 10 buckets. This volume correction is separate from accounting for the moisture contributed to the mix water.
4A foundation will be exposed to sulfate-bearing groundwater. Which decision is appropriate before selecting its concrete?
A.Select white cement because of its color
B.Add extra water to dilute the sulfate exposure
C.Use any rapid-setting binder without checking durability
D.Follow a specified sulfate-resistant concrete system suitable for the assessed exposure
Explanation: Sulfate exposure affects binder selection and the required concrete quality. Resistance depends on the complete specified system, including permeability, materials, and curing, rather than the cement name alone.
5Why may lime be included in a specified cement-lime-sand masonry mortar?
A.To remove the need for all cement hydration
B.To improve workability and water retention
C.To convert the sand into coarse aggregate
D.To make every mortar suitable for sulfate exposure
Explanation: Lime can improve plasticity and water retention, helping mortar spread and bond to suitable masonry units. The proportions must suit the specified mortar rather than being increased arbitrarily.
6A fresh concrete sample is tested by lifting a filled cone vertically and measuring the sample's subsidence. What property is being assessed?
A.Cement soundness
B.Hardened compressive strength
C.Reinforcement corrosion
D.Fresh concrete consistency
Explanation: The slump test indicates the consistency of suitable fresh concrete. It does not directly prove compressive strength or permit uncontrolled water addition to obtain a preferred result.
7A worker proposes adding unmeasured water to an approved concrete batch because it is difficult to place. What is the main quality concern?
A.An increased water-to-cement ratio can reduce strength and durability
B.The aggregate will become the binding agent
C.The specified strength automatically increases with slump
D.The cement content rises in the same proportion
Explanation: Uncontrolled water addition changes the approved mix and can leave a more porous hardened material. Placement difficulties should be addressed through the specified quality-control process, including any permitted adjustments.
8Fresh concrete is exposed to hot, drying wind. Why should the specified curing measures begin promptly?
A.To remove all moisture before hydration starts
B.To maintain moisture and suitable conditions for hydration
C.To substitute for missing reinforcement
D.To ensure the surface can be painted immediately
Explanation: Curing limits premature moisture loss and supports continued hydration. The method and duration depend on the concrete and exposure; a dry-looking surface is not proof that curing is complete.
9Which tool is primarily used to pick up and spread mortar while laying bricks?
A.Pointing iron
B.Club hammer
C.Brick bolster
D.Brick trowel
Explanation: A brick trowel carries and spreads mortar for bedding masonry units. Smaller pointing tools are used for working and finishing joints.
10In a tube scaffold, which horizontal member runs parallel to the building face and connects the vertical standards?
A.Putlog
B.Base plate
C.Diagonal brace
D.Ledger
Explanation: Ledgers run longitudinally between standards. Transverse members support the platform across the scaffold's width, while braces resist racking.
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