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MCQ
301. The coefficient of hardness of stones used in road works should not be greater than : [PPA-20]
10
12
15
17
302. Which of the following is the purest form of iron? [BB-20]
Cast iron
Wrought iron
Mild steel
High carbon steel
303. Soundness of cement is tested by- [BB-20]
Vicats appararus
Le-chatelier apparatus
Compressive strength testing apparatus
none of these
304. Oil point-এর ক্ষেত্রে সাধারণত Solvent হিসাবে ব্যবহার করা হয়- [BPSC-20]
Linseed oil
Turpentine
Naptha
Kerosene
305. Le-chatelier apparatus used to perform- [BPSC-20]
Fineness test
Soundness test
Consistency test
Compressive strength test
307. If water cement ratio decrease, compressive strength of concrete will-. [MOD-20]
increase
decrease
no change
increase
308. Good quality of cement should have higher percentage of-. [MOD-20]
silica
free lime
di-calcium silicate
tri-calcium silicate
310. Seasoning of timber-. [MOD-20]
increase the weight of timber
improves strength properties of timber
does not give dimensional stability
all of these
311. Granite is an example of- [MES-18, MOD-20]
aqueous rocks
sedimentary rock
metamorphic rocks
igneous rocks
312. [MOD-20] What is the unit weight of water?
50 Ib/ft²
62.5 Ib/ft²
90.5 Ib/ft^3
100 lb/ft^3
313. Gypsum is added in the manufacture of Portland cement in order to- [MOD-20]
shorten the setting time of cement
lengthen the setting time of cement
decrease the burning temperature
decrease the grinding time
316. Which of the following cements is suitable for use in massive concrete structures such as large dams? [BB-20]
Ordinary Portland cement
Low heat cement
Rapid hardening cement
Sulphate resisting cement
318. Efflorescence is caused if-. [MOD-20]
the alkaline salt is present in the bricks
the clay used for making bricks contain pyrite
the water used for pugging the clay contain gypsum
all of the above
319. Quick lime on reacting with water gives- [MOD-20]
hydraulic lime
hydrated lime
poor lime
slaked lime
320. Calculate standard consistency (%) when 100ml if water is added in 1kg of cement-----[BB-20]
10
1000
100
1