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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 10
Q1 | Modulus of elasticity of steel as per IS: 4561978 shall be taken as
- 20 kn/cm²
- 200 kn/cm²
- 200 kn/mm²
- 2 × 106 n/cm²
Q2 | The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
- 100 kg/cm2
- 150 kg/cm2
- 200 kg/cm2
- 250 kg/cm2
Q3 | The cement becomes useless if its absorbed moisture content exceeds
- 1 %
- 2 %
- 3 %
- 5 %
Q4 | In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
- 100 mm
- 150 mm
- 200 mm
- 250 mm
Q5 | For preparing a test-specimen, it is necessary
- to mix cement and fine aggregate by dry hand
- to mix coarse aggregates
- to mix water to the cement, fine aggregates and coarse aggregates
- all the above
Q6 | For a good concrete
- aggregates should be hard and durable
- water should be free from organic materials
- cement should be sufficient to produce the required strength
- all the above
Q7 | The process of hardening the concrete by keeping its surface moist is known
- placing
- wetting
- curing
- compacting
Q8 | For the construction of the retaining structures, the type of concrete mix to be used, is
- 1 : 3 : 6
- 1 : 2 : 4
- 1 : 1½ : 3
- 1 : 4 : 8
Q9 | The produce impermeable concrete
- thorough mixing of concrete is required
- proper compaction of concrete is required
- proper curing of concrete is required
- all the above
Q10 | Pozzolanic properties exist in
- shales
- fly ash
- pumicite
- all the above
Q11 | A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth(1/D) is less than
- 1.5
- 2.0
- 2.5
- 3.0
Q12 | Pick up the correct statement from the following:
- the weight of ingredients of concrete mix, is taken in kilograms
- water and aggregates are measured in litres
- 20 bags of cement make one tonne
- all the above
Q13 | If fineness modulus of sand is 2.5, it is graded as
- very fine sand
- fine sand
- medium sand
- coarse sand
Q14 | Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
- 28 liters
- 30 liters
- 32 liters
- 34 liters
Q15 | The increased cohesiveness of concrete, makes it
- less liable to segregation
- more liable to segregation
- more liable to bleeding
- more liable for surface scaling in frosty weather
Q16 | Concrete is unsuitable for compaction by a vibrator if it is
- dry
- earth moist
- semi-plastic
- plastic
Q17 | In order to obtain the best workability of concrete, the preferred shape of aggregate is
- rounded
- elongated
- angular
- all of the above
Q18 | Hydration of cement is due to chemical action of water with
- tricalcium silicate and dicalcium silicate
- dicalcium silicate and tricalcium aluminate
- tricalcium aluminate and tricalcium alumino ferrite
- all the above
Q19 | An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to beflaky if its least dimension is less than
- 22.5 mm
- 18.5 mm
- 16.5 mm
- 13.5 mm
Q20 | Approximate value of shrinkage strain in concrete, is
- 0.003
- 0.0003
- 0.00003
- 0.03
Q21 | For quality control of Portland cement, the test essentially done is
- setting time
- tensile strength
- consistency
- all the above
Q22 | Strength of concrete with passage of time
- increases
- decreases
- fluctuates
- remains constant
Q23 | Which of the following statements is incorrect?
- higher vee-bee time shows lower workability
- higher slump shows higher workability
- higher compacting factor shows higher workability
- none of the above
Q24 | To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at atemperature between
- 1100° and 1200°c
- 1200° and 1300°c
- 1300° and 1400°c
- 1400° and 1500°c
Q25 | In a pile of length , the points of suspension from ends for lifting it are located at
- 0.207 l
- 0.25 l
- 0.293 l
- 0.333 l