Concrete Technology Practice Test 10

1. What should be the minimum water cement ratio?

<.45

.45

>.45

2. When the concrete in fresh stage is exposed to freeze before certain pre-hardening period, compressive strength may get __________

Increased to 50%

Decreased to 25%

Decreased to 50%

Increased to 25%

3. Concrete is not recommended to be placed at a temperature below __________^oC.

4. ________ has designated the concrete mixes into a number of grades as M10, M15.

IS 456-2010

IS 513-1999

IS 456-2000

IS 465-2000

5. Which test can be performed without skilled labor?

Bend liquid test

Probe test

Dye penetrant test

Torsion test

6. A ___________ paste structure undergoes ___________ creep.

Good, average

Poor, high

Poor, low

Good, high

7. IS 1489(Part 2):1991 is for ______________

Methods of test for pozzolanic materials

Code of practice for general construction of plain and reinforced concrete for dams and other massive structures

Specification for Portland-pozzolana cement: Part 2 Calcined clay based

Specification for Portland pozzolana cement Part 1 Flyash based

8. Compressive strength of hardened concrete is done by _______

Concrete core test

Tensile splitting test

Cube test

Flexure test

9. Large temperature differentials within the concrete member may promote __________

Elastic shrinkage

Good strength

Cracking

High workability

10. It is difficult to retain moisture for hydration for RAPID EVAPORATION OF WATER DURING CURING PERIOD.

False

True