# Basic Civil Engineering MCQs – Properties of Stones

1 - Question

1. For a good building stone how much is the required crushing strength?
a) Less than 50 N/mm2
b) Greater than 100 N/mm2
c) 155 N/mm2
d) 10 N/mm2
Explanation: Crushing strength or compressive strength of a stone is the load per unit area at which the stone starts cracking. It should be greater than 100 N/mm2 to ensure sufficient strength for use in construction.

2 - Question

2. Which of the following is a good fire-resistant stone?
a) Clay
b) Granite
c) Quartz
d) Limestone
Explanation: Granite and Quartz undergo sudden expansion and flies into splinters. Limestone gets easily crumbled. Clay can withstand higher temperature and is used in pizza ovens, fireplaces, etc…

3 - Question

3. What is a freestone?
a) Stone free from impurities
b) Stone that doesn’t require dressing
c) Metamorphic stone
d) Stone free from veins and planes of cleavage
Explanation: For the ease of quarrying a stone must be soft, compact-grained, homogeneous, free from veins and planes of cleavage.

4 - Question

4. Why are stones with lighter shades of colour preferred?
a) Easy to clean
b) Easily available
c) Don’t spoil the appearance
d) Darker shades are heavier
Explanation: Even if the stone fades a little bit it will not show a striking difference and doesn’t spoil the look of it. They don’t need to be painted or maintained much compared to darker shades.

5 - Question

5. Hardness is an important parameter considered in the construction of:
a) Slabs
b) Walls
c) Bridges
d) Arches
Explanation: It’s required in structures subjected to heavy loading. Bridge is one such structure. Slabs, walls and arches are not subjected to heavy loadings as a bridge.

6 - Question

6. What is the required specific gravity for a good building stone?
a) Greater than 2.7
b) Less than 3
c) Greater than 3
d) Less than 2.7
Explanation: As per IS standards. Heavy stones are used in the construction of abutments, dams, docks. Lighter ones are used in building construction.

7 - Question

7. The percentage absorption by weight of a good stone, after how many hours should not exceed .6?
a) 6 hrs
b) 12 hrs
c) 48 hrs
d) 24 hrs
Explanation: As per IS standards, 24 hrs is the time a stone has to be immersed in water to check for water absorption. Time less or more than this would not result in providing the appropriate data.

8 - Question

8. What texture should a building stone possess?
a) Loose grains
b) Crystalline structure
c) Cavities
d) Cracks
Explanation: Texture is the grains composing the stone in the strata. Crystalline structure is the required texture. Other options are undesired textures.

9 - Question

9. Seasoning is required for stones.
a) True
b) False
Explanation: A stone should be properly dried before using for structural works. The sap contained in freshly quarried stones will make them soft and lead to decay eventually.

10 - Question

10. Toughness index of a good stone should be more than:
a) 17
b) 18
c) 13
d) 19