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MCQ
7221. Loss Angeles testing machine is used to conduct:
Abrasion test
Attrition test
Crushing strength test
Impact test
ব্যাখ্যাঃ Resistance to abrasion of aggregate is deferemined in laboratory by loss angeles test machine.
7222. A soil consolidated under the existing over- burden pressure, is called:
Pre-consolidated
Normally consolidated
Over-consolidated
None of these
ব্যাখ্যা: Over-consolidation is a relative term which compare the stress acting on soild in current state, to highest stress experienced by the soil. If the current stress is less than that applied in the past the soil is over consolidated.
7223. After pre-stressing process is completed, loss of stress occurs due to-
Shrinkage of concrete
Creep of concrete
Elastic shortening of concrete
All of the above
ব্যাখ্যা: Loss of stress occurs due 10- (i) due to anchorage slip (ii)due to shrinkage of concrete, (iii) due to friction (iv) due to elastic shortening of concrete.
7224. The entrained air in concrete-
increase workability
decrease workability
decrease resistance to weathering
increase strength
7225. The bending moment of cantilever beam shown below figure at 'A' is:
Zero
8 T-m
16 T-m
14 T-m
7226. Why are steel reinforcing rods used in concrete beams:
To make it carry compression
To make it carry tension
To make it carry both compression and tension
None of these
7227. The roof type suitable in plains where rainfall is meagre and temperature is high is:
Pitched and sloping roof
Flat roof
Shell roof
None of these
ব্যাখ্যা: A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10 Flat roof is used to where rainfall is low and temperature is high.
7228. Enlarged head of a supporting column of a flat slab is technically known as:
Supporting end of the column
Top of the column
Capital
Drop panel
ব্যাখ্যা: Column capital between the column and the load thrusting down upon it, broadening the area of the column's supporting surface.
7229. The maximum permissible limit for iron in drinking water is:
0.1 mg/L
0.3-1 mg/L
2-2.5 mg/l.
5 mg/L
7230. The most suitable equipment for compacting clay soil is a:
Smooth wheet roller
Preumatic tyred roller
Sheep foot roller
Vibrator
ব্যাখ্যাঃ Sheep foot roller are used for compacting fine grained soils such as heavy clays and silty clay. Sheep foor rollers are used for campaction of soil in damı embankments, subgrade layers in pavements and ruil road construction projects.
7231. The member of independent equations to be satisfied for static equilibrium of a plane structure is:
।
2
3
6
7232. Machine foundation is subjected to:
Static loads
Wind loads
Dynamic loads
Static and dynamic loads
7233. Standard BOD is measured at:
20°C-1 day
25°C-3 day
20°C-5 day
30°C-5 day
7234. When a cohesionless soil attains quick condition, it looses:
Shear strength
Bearing capacity
Both (ক) and (খ)
Neither (ক) and (খ)
ব্যাখ্যাঃ Cohesionless soilds are defined as any free running type of soil such as sand, Gravel and stone. Cohesionless soil anains quick condition then it lose it's shear strengh and bearing capacity.
7235. Disinfection of water results in-
Removal of turbidity
Removal of hardness
Killing of disease bacteria
Removal of taste
ব্যাখ্যাঃ Water disinfection means the removal, deactivation or killing of pathogenic microorganisms.
7236. The transverse reinforcements provided at right angles to the main reinforcements in a slab--
Distributed load
Resist the temperature stress
Resist the shrinkage stress
All of the above
ব্যাখ্যাঃ The distribution reinforcement have termed as transvers reinforcement is provided that to resist the stresses produced by temperature changes and shrinkage of concrete in that direction.
7237. The type of bond in a brick masonry containing altenate courses of stretcher and headres is called:
Flemish bond
English bond
Stretcher bond
Header bond
7238. Which types of forces are generated during earthquake?
Vertical Shear
Horizontal Shear
Combination of both horizontal & vertical shear
Bending moment
ব্যাখ্যা: Earthquake force however possess several characteristic that make them unique in comparison with any other force such as gravity wind and thermal force. Earthquake force are the result of a back and forth, and up and down montior of the ground that supports a structure.
7239. In a pre-stressed member, it is advisable to use:
Low strength concrete only.
High strength concrete only.
Low strength concrete but high tensile steel.
High strength concrete and high tensile steel.
7240. Plane and geodetic surveying are classification of surveying based on:
Methodology
Earth's curvature
Ojbect of survey
Instrument