# Concrete Technology Questions and Answers – Concept of Concrete Mix Design

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Concept of Concrete Mix Design”.

1. The _________ compressive strength required from structural consideration.
a) Nominal
b) Minimum
c) Maximum
d) No

Explanation: Option d can be eliminated easily because we need atleast some compressive strength. The minimum compressive strength required from structural consideration.

2. The adequate workability necessary for _________ compaction with the compacting equipment available.
a) Half
b) Quarter
c) Full
d) Double

Explanation: Option d can be eliminated easily because double compaction is not possible. The adequate workability necessary for full compaction with the compacting equipment available.

3. __________ water-cement ratio content to give adequate durability for the particular site conditions.
a) Minimum
b) Nominal
c) .5
d) Maximum

Explanation: Maximum water-cement ratio and/or maximum cement content to give adequate durability for the particular site conditions. It helps to avoid shrinkage cracking due to temp cycle in mass concrete.

4. _________ cement content to avoid shrinkage cracking due to temperature cycle in mass concrete.
a) Minimum
b) Nominal
c) .5
d) Maximum

Explanation: Maximum cement content to avoid shrinkage cracking due to the temperature cycle in mass concrete. It gives adequate durability for the particular site condition.

5. __________ has designated the concrete mixes into a number of grades as M10, M15.
a) IS 456-2000
b) IS 456-2010
c) IS 513-1999
d) IS 465-2000

Explanation: IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40.
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6. What is the approx. mix proportion for M10?
a) 1:3:6
b) 1:2:4
c) 1:1.5:3
d) 1:1:2

Explanation: According to IS 456-2000 code, the approximate value of mix proportion for grade M10 is 1:3:6.

7. What is the approx. mix proportion for M15?
a) 1:3:6
b) 1:2:4
c) 1:1.5:3
d) 1:1:2

Explanation: According to IS 456-2000 code, the approximate value of mix proportion for grade M15 is 1:2:4.

8. What is the approx. mix proportion for M20?
a) 1:3:6
b) 1:2:4
c) 1:1.5:3
d) 1:1:2

Explanation: According to IS 456-2000 code, the approximate value of mix proportion for grade M20 is 1:1.5:3.

9. What is the approx. mix proportion for M25?
a) 1:3:6
b) 1:2:4
c) 1:1.5:3
d) 1:1:2

Explanation: According to IS 456-2000 code, the approximate value of mix proportion for grade M25 is 1:1:2.

10. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by __________
a) IS 456-2000
b) IS 456-2010
c) IS 513-1999
d) IS 465-2000

Explanation: Option can be eliminated because there is no such code. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by IS 456:2000.

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