Quiz: CIVIL ENGINEERING
Topic: CONCRTE TECHNOLOGY
Each question carries 1 mark
Negative marking: No negative marking
Time: 10 Minutes
Q1. Compaction of concrete helps in
(a) segregation of aggregates
(b) Removal of excess water
(c) increase of density
(d)addition of required air voids
Q2. Zinc or aluminum powders are used as ___________
(c) air entraining agents
Q3. Poisson’s ratio for concrete………
(a) Increase with richer mix
(b) Decrease with richer mix
(c) Remains constant
(d) none of these
Q4. In concrete, while hand mixing is adopted excess cement to be added is
Q5. The process of applying cement mortar under pressure through a nozzle is called:
Q6. The leaching action in concrete is the example of?
(c) chemical reaction
Q7. The tie bars in a concrete pavement are provided in:
(a) Contraction joints
(b) Expansion joints
(c) Longitudinal joints
(d) Construction joints
Q8. Sugar when added to cement will act as:
(a) an accelerator
(b) A retarder
(c) A workability admixture
(d) An air entraining agent
Q9. Shrinkage in concrete increases its?
(a) bond strength
(b) flexural strength
(c) compressive strength
(d) tensile strength
Q10. Green concrete may be made by adding
(a) Chromium oxide
(b) Iron hydroxide
(c) Barium permanganate
(d) Iron oxide
Sol. compaction of concrete helps in removal of air voids and increase the density and strength of concrete.
Sol. Zinc or aluminum powders are used as air entraining agents. Air entraining agents increase the workability of concrete.
Sol. Poisson’s ratio of concrete is 0.15. It increase with increase in the richer mix.
Sol. In concrete, while hand mixing the excess cement to be added is 10%.
Sol. The process of applying cement mortar under pressure through a nozzle is called Guniting . The machine which is used for guniting is called cement gun. It apply a pressure of 2.5 kg/cm² – 3.5 kg/cm² through nozzle.
Sol. The tie bars in concrete pavement are provided in Longitudinal joints.
Sol. Sugar when added to cement will act as a retarder.
Sol. Shrinkage in concrete increases its bond strength.
S10. Ans. (a)
Sol. Green concrete may be made by adding Chromium oxide.