SSC JE CE Quiz_Concrete Technology Booster Quiz-10 for AE & JE Exams Exams

Question 1

Which of the following factors affect the workability of concrete?

1. Cement content

2. Shape of aggregates

3. Size of aggregate

4. fineness of cement

5. Use of admixture

Question 2

A 5 m³ central concrete mixing plant takes in 1480 kg of cement, 4620 kg of sand and 5430 kg of coarse aggregates along with 760 kg of water per batch. These is a reduction of 1.6% in volume of the freshly mixed wet concrete from the nominal volume the unit weight of freshly mixed wet concrete will be:

Question 3

If strength of fully matured sample in 50 MPa. Find the strength of same sample at 7 days When the temperature at which sample cured is 20°C on day and 15°C during nights for 7 days. If the plowman constants A = 32, B = 54

Question 4

The cement and water slurry coming on the top and setting on the surface is called

Question 5

Consider the following statements:
1) If more water is added to concrete for increasing its workability, it results into concrete of low strength.
2) No slump is an indication of a good workable concrete.
3) Higher the slump of concrete, lower will be its workability.
4) Workability of concrete is affected by water content as well as water-cement ratio.
Which of the above statements are correct?

Question 6

Which of the following statements are correct regarding the pull-out test on concrete?
(i) It is performed on hardened concrete
(ii) It never causes any damage to the concrete
(iii) It can sometimes be considered to be a non-destructive test

Question 7

Which of the following factors would greatly affect the attainment of best possible strength of the concrete mix produced using the weigh-batcher?
1) Moisture content in the sand and gravel
2) Inadequate or excess use of approved admixtures
3) Speed of rotation of the drum
4) Non-emptying of the drum as fully as possible

Question 8

Which of the following tests compares the dynamic modulus of elasticity of samples of concrete?

Question 9

Assertion (A): Rebound hammer (Schmidt hammer) test gives only approximate estimation of strength of the concrete specimen.
Reason (R): The test represents the hardness of the surface and provides no idea of the concrete inside.

Question 10

Which of the following pairs are correctly matched?
1) Particle size : Affects workability and texture
2) Absorption and : Affects mix surface moisture proportions
3) Grading : Maximizes cement content
4) Bulk density : Significant for stability
Select the correct answer using the codes given below: