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হাইড্রোলিক্স MCQ
501. Standard BOD is measured at:
20°C-1 day
25°C-3 day
20°C -5 day
30°C-5 day
ব্যাখ্যা: BOD-এর সাহায্যে পানিতে অক্সিজেনের মাত্রা কতটুকু আছে তা পরিমাপ করা হয়। BOD-এর পূর্ণরূপ Biochemical Oxyzen Demand। পানির বিশুদ্ধতা পরিমাপ করার জন্য ৫ দিন 20℃ তাপমাত্রা প্রয়োগ করা হয়।
502. The bending moment of cantilever beam shown below figure at 'A' is:
Zero
8 T-m
16 T-m
14 T-m
ব্যাখ্যাঃ The figure is cantilever beam. Cantilever beam supported on one side and other side is free Bending moment will be zero on the supported and will be maximum at free end.
503. 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.
ব্যাখ্যা: Steel reinforcing rods used in concrete beam because they have good tensile strength, concrete carry only compression strength.
504. The member of independent equations to be satisfied for static equilibrium of a plane structure is:
1
2
3
6
505. The roof type suitable in plains where rainfall is meagre and temperature is high is:
Pitched and sloping roof
Flat roof
Shell roof
none
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.
506. Plane and geodetic surveying are classification of surveying based on:
Methodology
Earth's curvature
Ojbect of survey
Instrument
ব্যাখ্যাঃ Plane and geodetic surveying based on the considerations and true shape of the earth. Plaue surveying axsumes the earth is flat and geodetic surveying the curvature of the earth.
507. The moment at a hinge will be:
Infinity
Zero
Depends upon acting force
None of these
ব্যাখ্যাঃ The bending moment at ends of simply supported and roller or hinge supported beam is taken zern.
508. 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
509. Machine foundation is subjected to:
Static loads
Wind loads
Dynamic loads
Static and dynamic loads
ব্যাখ্যা : Machine foundation are subjected to the dynamic lond caused by the machine. Theses dynamic loud are then transferred to the foundation supporting the machine
510. The entrained air in concrete-
increase workability
decrease workability
decrease resistance to weathering
increase strength
ব্যাখ্যাঃ Air entrainent increases the workability of concrete without much increase in water cement ratio.
511. 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.
512. A soil consolidated under the existing over- burden pressure, is called:
Pre-consolidated
Normally consolidated
Over-consolidated
None of these
ব্যাখ্যাঃ 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.
513. The maximum permissible limit for iron in drinking water is:
0.1 mg/L
2-2.5 mg/L
0.3-1 mg/L.
5 mg/L
ব্যাখ্যাঃ The present recommended limit for iron in water 0.3- 1 mg/L. It is based on taste and appearance rather than on any deterimental health effect.
514. Which types of forces are generated during earthquake?
Vertical Shear
Horizontal Shear
Bending moment
Combination of both horizontal & vertical shear
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.
515. 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 attains quick condition then it lose it's shear strengh and bearing capacity.
516. 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.
517. The type of bond in a brick masonry containing altenate courses of stretcher and headres is called:
Flemish bond
Stretcher bond
English bond
Header bond
ব্যাখ্যাঃ যে বন্ডের একস্তর স্ট্রেচার এবং অপর স্তর হেডার গাঁথুনি দ্বারা গঠিত হবে, তাকে ইংলিশ বন্ড বলে।
518. 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
ব্যাখ্যাঃ In a pre-stressed member we used to high strength concrete and high tensile steel. High strength concrete to develop greater bond stress in pre-stressed member.
519. Loss Angeles testing machine is used to conduct:
Abrasion test
Impact test
Attrition test
Crushing strength test
ব্যাখ্যাঃ Resistance to abrasion of aggregate is deferemined in laboratory by loss angeles test machine.
520. 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.