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?
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:
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
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.
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:
Explanation: Toughness is the ability to resist impact forces. A good building stone should have high toughness index to resist vibrations from machinery, moving loads, etc…
11 - Question
11. A percentage wear of 3% indicates a good stone.
Explanation: A percentage wear of less than 3% indicates a non-satisfactory stone. A percentage wear of 3% indicates a tolerable stone and greater than 3% indicates a good quality stone.