351. What is lime primarily made from?
a) Limestone
b) Sand
c) Cement
d) Clay
View Answer
Correct answer: a) Limestone
Explanation: Lime is primarily made from limestone, which is a sedimentary rock composed mainly of calcium carbonate.
352. What is the chemical formula for calcium oxide, the main component of lime?
a) CaO
b) NaCl
c) CO2
d) H2O
View Answer
Correct answer: a) CaO
Explanation: The chemical formula for calcium oxide, the main component of lime, is CaO.
353. What is the process called when limestone is heated to a high temperature to produce lime?
a) Calcination
b) Carbonation
c) Hydration
d) Curing
View Answer
Correct answer: a) Calcination
Explanation: The process of heating limestone to a high temperature to produce lime is called calcination.
354. Which type of lime is produced by heating limestone at a lower temperature compared to other types of lime?
a) Hydraulic lime
b) Quicklime
c) Dolomitic lime
d) Slaked lime
View Answer
Correct answer: a) Hydraulic lime
Explanation: Hydraulic lime is produced by heating limestone at a lower temperature compared to other types of lime. It possesses hydraulic properties and can be set underwater.
355. Which type of lime is produced by hydrating quicklime with water?
a) Hydraulic lime
b) Quicklime
c) Dolomitic lime
d) Slaked lime
View Answer
Correct answer: d) Slaked lime
Explanation: Slaked lime is produced by hydrating quicklime with water, resulting in a chemical reaction that produces calcium hydroxide.
356. What is the common name for calcium hydroxide, a compound produced when lime is hydrated with water?
a) Limestone
b) Gypsum
c) Lime putty
d) Lime mortar
View Answer
Correct answer: c) Lime putty
Explanation: Calcium hydroxide, produced when lime is hydrated with water, is commonly known as lime putty.
357. Which property of lime allows it to be used as a binding material in construction?
a) Plasticity
b) Durability
c) Hardness
d) Elasticity
View Answer
Correct answer: a) Plasticity
Explanation: Lime possesses plasticity, which means it can be shaped and molded when mixed with water, making it suitable as a binding material in construction.
358. What is the process of gradually exposing lime to air to convert calcium hydroxide back into calcium carbonate called?
a) Carbonation
b) Curing
c) Hydration
d) Calcination
View Answer
Correct answer: a) Carbonation
Explanation: The process of gradually exposing lime to air to convert calcium hydroxide back into calcium carbonate is called carbonation.
359. Which type of lime is commonly used for historic building restoration due to its compatibility with existing lime mortar?
a) Hydraulic lime
b) Quicklime
c) Dolomitic lime
d) Slaked lime
View Answer
Correct answer: a) Hydraulic lime
Explanation: Hydraulic lime is commonly used for historic building restoration due to its compatibility with existing lime mortar and its ability to set underwater.
360. Which type of lime is commonly used in mortar, plaster, and stucco applications?
a) Hydraulic lime
b) Quicklime
c) Dolomitic lime
d) Slaked lime
View Answer
Correct answer: d) Slaked lime
Explanation: Slaked lime is commonly used in mortar, plaster, and stucco applications to provide binding properties and improve workability.
