The document discusses water-cement ratio, which is the ratio of the volume of water to the volume of cement in concrete. A lower ratio results in higher strength and durability but may make the concrete more difficult to work with. For concrete exposed to aggressive environments, the water-cement ratio should be lower than 0.4. The document then provides the typical water-cement ratios and ranges for different grades of concrete (M5, M7, M10, etc.) according to the mix proportions.

1. MIT ACEM – Question and Answers – Water Cement Ratio
MIT - RPA
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
Answer -______
2. A lower ratio leads to _____
a) High strength b) Low strength
c) Low durability d) Ease to work
Answer -______
3. For concrete exposed to a very aggressive
environment the w/c should be lower than _________
a) 1 b) .5
c) .4 d) .8
Answer -______
4. What is the range of water in M10?
a) 34-36L b) 29-32L
c) 26-30L d) 21-27L
Answer -______
5. What is the range of water in M15?
a) 34-36L b) 29-32L
c) 26-30L d) 21-27L
Answer -______
6. What is the range of water in M20?
a) 34-36L b) 29-32L
c) 26-30L d) 21-27L
Answer -______
7. What is the range of water in M25?
a) 34-36L b) 29-32L
c) 26-30L d) 21-27L
Answer -______
8. What is the approximate quantity of water in M5?
a) 60L b) 45L
c) 34L d) 85L
Answer -______
9. What is the approximate quantity of water in M7?
a) 60L b) 45L
c) 34L d) 85L
Answer -______
10. What is the approximate quantity of water in M10?
a) 60L b) 45L
c) 34L d) 85L
Answer -______
1 Answer: a
Explanation: The water–cement ratio is the ratio of the
weight of water to the weight of cement used in a
concrete mix.
2 Answer: a
Explanation: A lower ratio leads to higher strength
and durability, but may make the mix difficult to work
with and form.
3 Answer: c
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.
4 Answer: a
Explanation: The range of water for M10 (1:3:6) is 34
to 36 liters with a weight of 226kg of cement.
5 Answer: b
Explanation: The range of water for M15 (1:2:4) is 29
to 32 liters with a weight of 313kg of cement.
6 Answer: c
Explanation: The range of water for M20 (1:1.5:3) is
26 to 30 liters with a weight of 404kg of cement.
7 Answer: d
Explanation: The range of water for M25 (1:1:2) is 21
to 27 liters with a weight of 563 kg of cement.
8 Answer: a
Explanation: The approximate quantity of water in
grade M5 is nearly equal to 60 liters.
9 Answer: b
Explanation: The approximate quantity of water in
grade M7 is nearly equal to 45 liters.
10 Answer: c
Explanation: The approximate quantity of water in
grade M10 is nearly equal to 34 liters.