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থিউরি অব স্ট্রাকচার MCQ
41. 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
42. The entrained air in concrete-
increase workability
decrease workability
decrease resistance to weathering
increase strength
43. 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.
44. The proportion of lime and sand in the mortar normally used in brick constructions are:
1:2
1:6
1:4
1:8
45. 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.
46. Uniformity coefficieny of a soil is:
equal to or greater than 1
equal to 1
equal to or less than 1
none of these
ব্যাখ্যাঃ The uniformity coefficient (cu) is defined as the ratio of Due to Dio A value of cu greater than 4 to 6 classific the soil as well graded. When cu is less than 4, it is classified as poorly graded or uniformly graded soil. Uniformly graded soil has identical particles with cu value approximately equal to 1.
47. Plane and geodetic surveying are classification of surveying based on:
Methodology
Earth's curvature
Ojbect of survey
Instrument
48. Standard BOD is measured at:
20°C-1 day
25°C-3 day
20°C-5 day
30°C-5 day
49. The moment at a hinge will be:
Infinity
Zero
Depends upon acting force
None of these
ব্যাখ্যাঃ The bending moment at ends of simpls supported and roller or hinge supported beam is taken zero,
50. 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
51. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called-
Density of liquid
Specific gravity of liquid
Compressibility of liquid
Surface tension of liquid
ব্যাখ্যা The specific griaunity of an object is the ratio between the density of an object to a reference liquid. Usually our reference liquid in water, which has a density of Ig/ml.
52. 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.
53. 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.
54. Machine foundation is subjected to:
Static loads
Wind loads
Dynamic loads
Static and dynamic loads
55. 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.
56. The bending moment of cantilever beam shown below figure at 'A' is:
Zero
8 T-m
16 T-m
14 T-m
57. 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.
58. 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.
59. 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.
60. 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.