201. While designing an air entrained concrete
a ) water cement ratio is reduced
b ) proportion of aggregates is reduced
c ) an allowance for the entrained air is made
d ) strength of the concretes , is reduced
e ) all of the above
202. An ideal ware house , is provided
a ) water proof masonry walls
b ) water proof roof
c ) few windows which remain generally
d ) 15cm thick concrete floor laid on a dry course of soling
e ) all of the above
203. Pick up the incorrect statement from the following :
a ) space between the exterior walls of a ware house and bag piles should be 30 cm
b ) cement bags should preferably be piled on wooden planks
c ) cement bags should be placed such that bags of one layer does not touch the bags of the adjacent layer
d ) width and height of the pile should not exceed 3 m and 2.70 m respectively
e ) none of the above
204. The specification of a cement bag for storage , are
a ) weight 50 kg
b ) height 18 cm
c ) plan area 3000 sq.cm
d) volume 35 litres
e ) all of the above
205. Ware house pack of cement means
a ) full capacity of ware house
b ) pressure exertion of the bags of upper layers
c ) pressure compaction of bags on lower layers
d ) packing the ware house
206 . Ware house set cement is
a ) cement which absorbs moisture in ware house
b ) cement which sets due to being adjacent wall
c ) cement which gets compressed due to load of several bags of cement above it
d ) there is no such setting
207. If the effective plan area of a warehouse is 54sq.m , and maximum height of piles permitted is 270cm , the number of cement bags to be stored , is
a ) 2000 bags
b ) 2200 bags
c ) 2400 bags
d ) 2700 bags
208. The internal dimensions of a ware house are 15m x 5.6m, and the maximum height of piles is 2.70 m. The maximum number of bags to be stored in two piles, are
a ) 1500 bags
b ) 2000 bags
c ) 2500 bags
d ) 3000 bags
209. Pick up the incorrect statement from the following :
a ) with passage of time , the strength of cement increases
b ) with passage of time , the strength of cement decreases
c ) after a period of 24 months , the strength of cement reduces to 50 %
d ) The concrete made with storage deteriorated cement , gains strength with time
210. To ensure constant moisture content in aggregates
a ) area of each aggregate pile shoul be large
b ) height of each aggregate pile should not exceed 1.50 m
c ) aggregate pile should be left for 24 hours before aggregates are used
d ) conical heaps of aggregates should be avoided to prevent moisture vibration e ) all of the above
211. An aggregate which passes through 25mm IS sieve and is retained on 20mm sieve , is said to be flaky if its least dimension is less than
a ) 13.5 mm
b ) 18.5 mm
c ) 16.5 mm
d ) 15.5 mm
212. Workability of concrete for a given water content is good if aggregates used , are
a ) rounded aggregate
b ) irregular aggregate
c ) angular aggregate
d ) flaky aggregate
213. An excess of flaky particles in concrete aggregates
a ) decrease the workability
b ) increase the quantity of water and sand
c ) affects the durability of concrete
d ) more than 15 % are not desirable
e ) all of the above
214. Grading of sand causes great variation in
a ) workability of concrete
b ) strength of concrete
c ) durability of concrete
d ) handling and placing
e ) all of the above
215. The durability of concrete is due to its resistance to
a ) deterioration from environmental condition
b ) internal disruptive forces
c ) chemical crack
d ) all of the above
216. The inelastic behavior of concrete is due to the
a ) shrinkage in concrete
b ) propagation of bond and mortar cracks
c ) presence of macro and micro cracks
d ) all of the above
217. The modulus of elasticity of concrete improves with
a) age
b ) high water cement ratio
c) shorter curing periods
d ) better compaction
218. Which of the following does not react with concrete ?
a ) sewage water
b ) sulphuric acid
c ) vegetable oil
d ) alcohol
219. The presence of algae in concrete
a ) reduces its strength
b ) reduces its bond
c ) causes a large entrainment of air
d ) all of the above
220. Quality control means
a ) extra cost
b ) a rational use of available resources
c ) adequate design to minimize cost
d ) all of the above
221. The cube strength of concrete exceeds the cylinder strength by ( in percent )
a ) 10 to 50
b ) 10 to 15
d ) 20 to 25
c ) 15 to 20
222. For cylindrical specimens , the dimension of cylinder generally used
a ) D = 15 cm , H = 30 cm
b ) D = 30 cm , H = 30 cm
c ) D = 15 cm , H = 15 cm
d ) D = 30 cm , H = 15 cm
223. For cylindrical specimens , minimum strength required should be
a ) 0.20 times the strength of 15 cm cubes
b ) 0.40 times the strength of 15 cm cubes
c ) 0.60 times the strength of 15 cm cubes
d ) 0.80 times the strength of 15 cm cubes
224. The surface area of standard cube used for finding compressive strength of concrete is
a ) 225 cm²
b ) 22500 mm²
c ) 0.0225 m²
d ) all of the above
225. During application of load on cylindrical specimen the failure plane makes an angle of ……… with the horizontal .
a ) 30⁰
b ) 45⁰
c ) 60⁰
d ) 75⁰
