Which one of the following is not the correct characteristic of an ideal mortar?
- ADevelops good adhesion with building unit such as bricks and stones
- BWithstands the stresses developed
- COffers less resistance to water penetrationCorrect
- DDurability
Solution
Concept
Requirements of a good mortar
Step-by-step solution
1. An ideal mortar must bond well to units, withstand stresses, be durable and resist water penetration. 2. "Offers less resistance to water penetration" is the opposite of a requirement.
Explanation
Mortar should be impervious enough to keep water out of the masonry. A mortar that offers less resistance to water penetration is not a good one.
Why the other options are wrong
Adhesion, strength and durability are all desirable characteristics.
Shortcut
Ideal mortar = adhesive, strong, durable, water-resistant.
Common mistake
Marking a correct characteristic in a "not" question.
Correct answer: C) Offers less resistance to water penetration