Q.1

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
  • none of these.
Q.2

Vicat apparatus is used for

  • fineness test
  • consistency test
  • test for setting time
  • test for tensile strength
  • none of these.
Q.3

Water cement ratio is generally expressed in volume of water required per

  • 10 kg
  • 20 kg
  • 30 kg
  • 40 kg
  • 50 kg
Q.4

Sand requiring a high water cement ratio, belongs to

  • Zone I
  • Zone II
  • Zone III
  • Zone IV.
Q.5

Pick up the correct statement from the following:

  • The quality of water governs the strength of concrete
  • The quantity of water required for concreting, depends upon the grading of aggregate amd method of compaction
  • 10% excess of water reduces the strength of concrete by 15%
  • 30% excess of water reduces the strength of concrete by 50%
  • All the above.
Q.6

The specifications of a cement bag for storage, are

  • all the above.
  • weight 50 kg
  • height 18 cm
  • plan area 3000 sq. cm
  • volume 35 litres
Q.7

In the method of voids for determination of the quantity of cement paste, it is assumed that

  • Voids in coarse aggregates are filled by fine aggregates
  • Voids in fine aggregates are filled by the cement paste
  • Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
  • Volume of cement paste required is equal to total volume of voids in fine aggregates plus 15% extra
  • All the above.
Q.8

The surface where two successive placements of concrete meet, is known as

  • Contraction joint
  • Expansion joint
  • Construction joint
  • both (a) and (b)
  • both (6) and (c).
Q.9

Pick up the correct statement from the following:

  • Continuous grading is not necessary for obtaining a minimum of air voids
  • The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
  • The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
  • All the above.
Q.10

Pick up the correct statement from the following:

  • Construction joints in columns are provided a few cm below the junction of beam
  • Construction joints in columns are provided at the bottom haunching
  • Construction joints in beams and slabs are provided within middel third
  • Constructionjoints are generally provided in positions subjected to least shear force
  • All the above.
Q.11

The maximum percentage of chemical ingredient of cement is that of

  • magnesium oxide
  • iron oxide
  • aluminium
  • lime
  • silica.
Q.12

The void ratio of

  • single size coarse aggregate is roughly 0.45.
  • graded coarse aggregate is roughly 0.040
  • fine aggregate is roughly 0.45
  • all the above.
Q.13

Particles of 0.mm size are that of

  • clay
  • sand
  • gravel
  • none of these.
Q.14

If a grading curve is horizontal bet-wen the portions ofmm I.S. Sieve and 4.mm I.S. Sieve, the graded aggregates do not contain

  • 20 mm particles
  • 10 mm particles
  • 4.75 mm particles
  • all the above.
Q.15

Di-calcium silicate (C2S)

  • hydrates rapidly
  • generates less heat of hydration
  • hardens rapidly
  • provides less ultimate strength to cement
  • has less resistance to sulphate attack.
Q.16

For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is

  • 10 kg
  • 12 kg
  • 14 kg
  • 16 kg
  • 20 kg
Q.17

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

  • rounded aggregate
  • irregular aggregate
  • angular aggregate
  • flaky aggregate
  • none of these.
Q.18

An ideal ware house, is provided

  • water proof masonry walls
  • water proof roof
  • few windows which remain generally closed
  • 15 cm thick concrete floor laid on a dry course of soling
  • all the above.
Q.19

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

  • rounded aggregate
  • irregular aggregate
  • angular aggregate
  • flaky aggregate
  • none of these.
Q.20

Pick up the correct statement from the following:

  • Calcium chloride acts as a retarder
  • Gypsum (calcium sulphate) acts as an accelerator
  • Gypsum (calcium sulphate) acts as a retarder
  • Calcium chloride acts as an accelerator
  • Both (c) and (d).
Q.21

Slump test of concrete is a meausre ofits

  • consistency
  • compressive strength
  • tensile strength
  • impact value.
Q.22

Joints in concrete structures, are provided

  • to reduce the tensile stresses likely to be developed due to evaporation of water
  • to minimise the change in the dimensions of the slab
  • to minimise the necessary cracking
  • all the above.
Q.23

According to Water-Cement Ratio Law, the strength of workable plastic concrete

  • depends upon the amount of water used in the mix
  • does not depend upon the quality of cement mixed with aggregates
  • does not depend upon the quanity of cement mixed with aggregates
  • all the above.
Q.24

If the engineer-in-charge approves, thecm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

  • 10 cm
  • 15 cm
  • 20 cm
  • 25 cm
  • 30 cm
Q.25

The aggregate containing moisture in pores and having its suface dry, is known as

  • moist aggregates
  • very dry aggregates
  • dry aggregates
  • saturated surface dry aggregate
  • none of these.
Q.26

The bulk density of aggregates, is generally expressed as

  • tonnes/cubic metre
  • kg/cubic metre
  • kg/litre
  • g/cm3
  • none of these.
Q.27

The factor which affects workability, is

  • water content and its temperature
  • shape and size of the aggregates
  • grading and surface textures of the aggregates
  • air entraining agents
  • all the above.
Q.28

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer oflitre capacity, is

  • 15, 900 litres
  • 16, 900 litres
  • 17, 900 litres
  • 18, 900 litres
Q.29

An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No.more than

  • 5%
  • 10%
  • 15%
  • 20%
  • 25%
Q.30

Permissible compressive strength of Mconcrete grade is

  • 100 kg/cm2
  • 150 kg/cm2
  • 200 kg/cm2
  • 250 kg/cm2
  • 300 kg/cm2
0 h : 0 m : 1 s