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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 4
Q1 | If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270cm, the number of cement bags to be stored, is
- 2000 bags
- 2200 bags
- 2400 bags
- 2700 bags
Q2 | The property of fresh concrete, in which the water in the mix tends to rise to the surface whileplacing and compacting, is called
- segregation
- bleeding
- bulking
- creep
Q3 | Workability of concrete for a given water content is good if the aggregates, are
- rounded aggregate
- irregular aggregate
- angular aggregate
- flaky aggregates
Q4 | For preparing ordinary concrete, the quantity of water used, is
- 5% by weight of aggregates plus 20% of weight of cement
- 10% by weight of aggregates plus 10% of weight of cement
- 5% by weight of aggregates plus 30% of weight of cement
- 30% by weight of aggregates plus 10% of weight of cement
Q5 | Finer grinding of cement
- affects only the early development of strength
- affects only the ultimate strength
- both (a) and (b)
- does not affect the strength
Q6 | The light weight aggregates are obtained from
- sedimentary rocks
- metamorphic rocks
- igneous rocks
- volcanic source
Q7 | The aggregate impact value of the aggregate used in
- building concrete is less than 45
- road pavement concrete is less than 30
- runway concrete is less than 30
- all the above
Q8 | For walls, columns and vertical faces of all structural members, the form work is generallyremoved after
- 24 to 48 hours
- 3 days
- 7 days
- 14 days
Q9 | Efflorescence in cement is caused due to an excess of
- alumina
- iron oxide
- silica
- alkalis
Q10 | For given workability the grading requiring the least amount of water is one that gives
- greatest surface area for the given cement and aggregates
- least surface area for the given cement and aggregates
- least weight for the given cement and aggregates
- greatest weight for the given cement and aggregates
Q11 | Minimum pitch of transverse reinforcement in a column is
- the least lateral dimension of the member
- sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
- forty-eight times the diameter of transverse reinforcement
- lesser of the above three values
Q12 | Pick up the incorrect statement applicable to the field test of good cement.
- when one thrusts one\s hand into a bag of cement, one should feel warm
- the colour of the cement is bluish
- by rubbing cement in between fingers, one should feed rough
- all the above
Q13 | An aggregate is known as cyclopean aggregate if its size is more than
- 4.75 mm
- 30 mm
- 60 mm
- 75 mm
Q14 | Workability of concrete mix with low water cement ratio is determined by
- tensile strength test
- slump test
- compaction factor test
- flexural strength test
Q15 | The effect of creep on modular ratio is
- to decrease it
- to increase it
- either to decrease or to increase it
- to keep it unchanged
Q16 | The type of aggregates not suitable for high strength concrete and for pavements subjected totension, is
- rounded aggregate
- irregular aggregate
- angular aggregate
- flaky aggregate
Q17 | The maximum percentage of chemical ingredient of cement is that of
- magnesium oxide
- iron oxide
- silica
- lime
Q18 | The commercial name of white and coloured cement in India, is
- colorcrete
- silvicrete
- snowcem
- all the above
Q19 | An excess of flaky particles in concrete aggregates
- decreases the workability
- increases the quantity of water and sand
- more than 15% are not desirable
- all the above
Q20 | Increase in the moisture content in concrete
- reduces the strength
- increases the strength
- does not change the strength
- all of the above
Q21 | The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravitydams should be
- between 150 to 300 kg/cm2
- between 350 to 600 kg/cm2
- between 150 to 500 kg/cm2
- below 200 kg/cm2
Q22 | Select the incorrect statement
- lean mixes bleed more as compared to rich ones.
- bleeding can be minimized by adding pozzolana finer aggregate
- bleeding can be increased by addition \of calcium chloride
- none of the above
Q23 | Permissible compressive strength of M 150 concrete grade is
- 100 kg/cm2
- 150 kg/cm2
- 200 kg/cm2
- 250 kg/cm2
Q24 | Cement used for normal concrete construction, is obtained by burning a mixture of
- siliceous and argillaceous materials
- argillaceous and calcareous materials
- siliceous and calcareous materials
- siliceous, argillaceous and calcareous materials
Q25 | As compared to ordinary Portland cement, high alumina cement has
- higher initial setting time but lower final setting time
- lower initial setting time but higher final setting time
- higher initial and final setting times
- lower initial and final setting times