211. Addition of fibers to concrete mix results in improvement in

- compressive strength
- tensile strength
- bond strength
- flexural strength

212. Soundness test is performed to know the behaviour of aggregates against

- weathering action
- corrosion
- fatigue
- creep

213. For ensuring quality of concrete, use

- single sized aggregates
- two sized aggregates
- graded aggregates
- coarse aggregates

214. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are

- 70 liters of sand and 120 liters of aggregates
- 70 kg of sand and 140 liters of aggregates
- 105 liters of sand and 140 liters of aggregates
- 105 liters of sand and 210 liters of aggregates

215. The concrete may be accepted if the average equivalent cube strength of the cores, is atleast 85% of the cube strength of the concrete grade at the specified age and no individual core possesses strength less than

- 0.75
- 0.35
- 0.5
- 0.25

216. The risk of segregation is more for

- wetter mix
- larger proportion of maximum size aggregate
- coarser grading
- wetter mix and larger proportion of maximum size aggregate and coarser grading

217. The tensile strength of concrete is approximately what percent of compressive strength of concrete?

- 20%
- 50%
- 5%
- 10%

218. The stress strain curve of concrete in compression is obtained by testing the cylindrical specimen under

- Uniform rate of strain
- Uniform rate of stress
- Constant stress condition
- Constant strain condition

219. Workability of concrete is independent of

- mix proportions
- water contents
- size, shape and texture of aggregate
- none of above

220. Tensile strength of concrete is measured by

- direct tension test in UTM
- applying compressive load along the diameter of the cylinder
- applying third point loading on a prism
- applying tensile load along the diameter of the cylinder