# Concrete Technology Questions and Answers – Water Cement Ratio

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This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Water-Cement Ratio”.

1. Water cement ratio is ______
a) Volume of water to the volume of cement
b) Volume of water to the volume of concrete
c) Volume of concrete to the volume of cement
d) Volume of water to the volume of aggregates

Explanation: The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix.

2. A lower ratio leads to _____
a) High strength
b) Low strength
c) Low durability
d) Ease to work

Explanation: A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form.

3. For concrete exposed to a very aggressive environment the w/c should be lower than _________
a) 1
b) .5
c) .4
d) .8

Explanation: Higher is the aggressiveness of the environment lower should be the w/c ratio. For concrete exposed to a very aggressive environment, the w/c should be lower than 0.40.
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4. What is the range of water in M10?
a) 34-36L
b) 29-32L
c) 26-30L
d) 21-27L

Explanation: The range of water for M10 (1:3:6) is 34 to 36 liters with a weight of 226kg of cement.

5. What is the range of water in M15?
a) 34-36L
b) 29-32L
c) 26-30L
d) 21-27L

Explanation: The range of water for M15 (1:2:4) is 29 to 32 liters with a weight of 313kg of cement.
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6. What is the range of water in M20?
a) 34-36L
b) 29-32L
c) 26-30L
d) 21-27L

Explanation: The range of water for M20 (1:1.5:3) is 26 to 30 liters with a weight of 404kg of cement.

7. What is the range of water in M25?
a) 34-36L
b) 29-32L
c) 26-30L
d) 21-27L

Explanation: The range of water for M25 (1:1:2) is 21 to 27 liters with a weight of 563 kg of cement.

8. What is the approximate quantity of water in M5?
a) 60L
b) 45L
c) 34L
d) 85L

Explanation: The approximate quantity of water in grade M5 is nearly equal to 60 liters.

9. What is the approximate quantity of water in M7?
a) 60L
b) 45L
c) 34L
d) 85L

Explanation: The approximate quantity of water in grade M7 is nearly equal to 45 liters.

10. What is the approximate quantity of water in M10?
a) 60L
b) 45L
c) 34L
d) 85L

Explanation: The approximate quantity of water in grade M10 is nearly equal to 34 liters.

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