This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Stones – 2”.
1. The toughness of stone is said to be high if the value of the toughness index exceeds __________
Explanation: Toughness of stone is said to be high if the value of the toughness index exceeds 19. If it is below 13, then the stone is not tough and if it is between 13 and 19, then the stone is moderately tough.
2. For a good stone, the percentage absorption by weight after a day in the water absorption test should not exceed ____________
Explanation: For a good stone, the percentage absorption by weight after a day in the water absorption test should not exceed 0.60. Also, the specific gravity should be greater than 2.7 for good building stone.
3. ____________ is the process of taking out stones from natural rock beds.
Explanation: Quarrying is the process of taking out stones from natural rock beds. Stones obtained from quarrying are widely used for various engineering purposes.
4. Which of the following is not a method of quarrying?
Explanation: The various methods of quarrying are digging, heating, wedging and blasting. Before actually starting the quarry, it should be kept in mind to carefully examine the exposed surface of rock bed and it is essential to prepare a complete layout of different stages involved in the quarrying process.
5. The use of explosives in order to convert rocks into small pieces of stones is done in ___________
Explanation: The use of explosives in order to convert rocks into small pieces of stones is done in blasting. Blasting is used for quarrying hard stones without having any fissures or cracks. Stones obtained by this method are generally of small size.
6. Which tool is used to make blast holes in the process of blasting?
b) Tamping bar
Explanation: A jumper is a tool that is used to make blast holes in the process of blasting. However, a dipper is used to drill a hole to the desired depth.
7. Blasting powder is a mixture of _____________
a) Charcoal, sulphur and saltpetre
b) Aluminium, phosphorus and saltpetre
c) Charcoal, calcium and phosphorus
d) Sodium, sulphur and alum
Explanation: Blasting powder is a mixture of charcoal, sulphur and saltpetre. It is also known as gun powder and is commonly used as an explosive in the process of blasting.
8. Which tool is used to remove dust from blast holes in the process of blasting?
a) Priming needle
c) Tamping bar
d) Scraping spoon
Explanation: Scraping spoon is used to remove dust from blast holes in the process of blasting. A tamping bar is used to ram the material while refilling the blast holes.
9. Which of the following statements about dynamite is not correct?
a) It can be used for quarrying under water
b) It does not need hard tamping
c) It is cheaper than blasting powder
d) It is very strong
Explanation: Dynamite is an explosive used in the blasting process. It is very strong and can be used for quarrying under water as well. It does not need hard tamping. It is much costlier than the blasting powder.
10. Cordite is prepared from ___________
Explanation: Cordite is prepared from nitro-glycerine. It is a powerful explosive used in the blasting process and it can be used under water.
11. Rate of the burning of a good fuse is ___________
a) 1 mm/sec
b) 1 cm/sec
c) 1 m/sec
d) 1 cm/h
Explanation: A fuse is used to ignite the explosives. The rate of burning of a good fuse is 1 cm/sec.
12. Cutting of stones into suitable sizes with suitable surfaces after quarrying is known as ___________ of stones.
Explanation: Cutting of stones into suitable sizes with suitable surfaces after quarrying is known as dressing of stones. It is carried out in order to get the desired appearance from stonework.
13. The dragged finish is suitable for only soft stones.
Explanation: Dragged finish is suitable for only soft stones. In this, a drag or a comb is rubbed on the surface in all directions. A comb is a piece of steel with a number of teeth.
Explanation: The above figure represents boasted finish. In this, non-continuous parallel marks are made on the stone surface with the help of a boaster. These marks can be horizontal, vertical or even inclined.
15. Which of the following is not a property of an ideal preservative used for the preservation of stones?
a) It should be highly economical
b) It should allow moisture to penetrate the surface of the stone
c) It should be harmless
d) It should be non-corrosive
Explanation: An ideal preservative used for the preservation of stones should be highly economical. It should be harmless and non-corrosive. It should not allow moisture to penetrate the surface of the stone.
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