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Building Materials Booster Quiz -5

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Question 1

Assertion (A): The tests for determining the setting times of cements are of little use in assessing the hardening of cement concrete. Reason (A): Ultimate strength of concrete in-situ is not dependent upon the setting times of cement used.

Question 2

Assertion (A): Higher strength is achieved when superplasticizer is added to cement concrete mix.
Reason (R): By adding superplasticizer, the quantity of mixing water is reduced.

Question 3

Consider the following statements:
1) The crushing strength of concrete is fully governed by water-cement ratio.
2) Vibration has no effect on strength of concrete at high water-cement ratios.
3) Workability of concrete is affected by improper grading of aggregates.
Which of these statements is/are correct?

Question 4

Which factors comprise maturity of concrete?

Question 5

Consider the following statements:
Cement concrete is a/an
1) Elastic material
2) Bingham-plastic material
3) Visco-plastic material
Which of these statement is/are correct?

Question 6

Live load for roof trusses should not be less than

Question 7

Consider the following statements: A good soil for making bricks should contain
1) 30% alumina
2) 10% lime nodules
3) Only small quantity of iron oxides
4) 15% magnesia
Which of the above statements are correct?

Question 8

The carbonation process is demonstrated more by

Question 9

Under normal conditions using ordinary cement, the period of removal of the form work, is

Question 10

The bond between steel and concrete is mainly due to
1) Mechanical resistance
2) Pure adhesive resistance
3) Frictional resistance

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