This set of Basic Civil Engineering Multiple Choice Questions & Answers focuses on “Source and Classification of Lime”.
1. By which of the following ways is lime obtained?
c) Burning limestone
d) Crushing limestone
Explanation: It is not available naturally. It is obtained by burning limestone, shells of sea animals and boulders of limestone from old river beds.
2. Which of the following pairs is matched properly?
a) Class A – Concrete work
b) Class B – Mortar
c) Class C – Masonry work
d) Class D – White washing
Explanation: Based on percentage of CaCO3 in limestone, lime is classified into 3 – Class A, B & C.Class A is used for masonry work, Class C is used for white washing and there is no class D.
3. Lime has been conventionally classified into how many types?
Explanation: The three conventional classifications of lime are, Fat Lime, Hydraulic Lime and Poor Lime.
4. Which of the following is a property of Fat Lime?
a) Shakes very slowly
b) Contains clay
c) High degree of plasticity
d) Poor binding property
Explanation: Fat Lime is pure lime. The rest of the 3 options describe properties of poor lime.
5. Lime obtained from calcination of Pure Limestone is called:
a) Quick Lime
b) Pure Lime
c) Lean Lime
d) Rich Lime
Explanation: Quick lime is pure limestone product. It consists of oxides of calcium and is not crystalline. Pure Lime and Rich Lime are different names of Fat Lime. Lean Lime is also another name of Poor Lime.
6. What is the speciality of Hydraulic Lime?
a) Contains impurities
b) Does not set under water
c) Contains clay
d) Perfectly white in colour
Explanation: The clay content gives it the hydraulic property – capacity to set and harden even under water.
7. Which of the following slakes after few minutes?
a) Moderately Hydraulic Lime
b) Eminently Hydraulic Lime
c) Perfectly Hydraulic Lime
d) Feebly Hydraulic Lime
Explanation: Hydraulic Lime slakes at a slower rate than Pure Lime. It is subdivided into three – Feebly Hydraulic, Moderately Hydraulic (1-2 hrs) and Eminently Hydraulic (slakes with difficulty).
8. Which of the following types of Lime does not exist?
a) Dolomitic Lime
b) Roman Lime
c) Semi-Hydraulic Lime
d) Selentic Lime
Explanation: Semi-Hydraulic Lime contains lesser clay content than Hydraulic Lime. Dolomitic Lime comprises of high magnesium carbonate (35-46%) content. Selentic Lime is cement of grey chalk, with added gypsum. Roman Lime does not exist, instead there is Roman Concrete which is obtained by mixing lime and volcanic ash.
9. Which of the following ions causes the cement to set quickly?
Explanation: Sulphate arrests slaking and hence cement can set quickly and become stronger.
10. Lime is widely used for:
a) Waste water treatment
b) Manufacturing tiles
c) Jewellery making
d) As an aggregate
Explanation: Hydrated Lime is a highly efficient pH increasing agent. It is used as a primary coagulant for waste water treatment and contributes to the clarity of the water.
Sanfoundry Global Education & Learning Series – Basic Civil Engineering.
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