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MCQ
121. 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.
122. 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.
123. 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.
124. 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.
125. A pipe conveying sewage from plumbing system of a single building to common sewer is called:
house sewer
lateral sewer
main sewer
submain sewer
ব্যাখ্যা : Main sewer as the primary pipeline in a sewerage system to which all the branching pipes carrying sewage from different location. Submain sewer means a city or privated owned sewer pipe designed to convey sewage from two or more building laterals to a main sewer.
126. The arrangement made to support an unsafe structure temporarily as :
Shoring
Scaffolding
Underpinning
Jacking
ব্যাখ্যা: Shoring is the process of temporarily supporting a building, structure or trench with shores when in danger of during repairs. Shoring comes from shore, a timber or metal. Shoring may be vertical angled or horizontal.
127. The piece of a brick cut with its one corner equivalent to half the length and half the width of a full brick is known as:
Queen closer
Bevelled closer
King closer
Half-king closer
ব্যাখ্যাঃ King closer is obtained by cutting a triangular portion of the bricks such that half a header and half a stretcher are obtained on the adjoining cut faces.
128. Vertical construction joints are provided where the shearing forces are minimum in the case of the-
Slabs
Girder
Beams
All of these
ব্যাখ্যা: A vertical construction joint is provided when concrete pouring needs to be stopped due to some reason and then is continued again later. Construction joints are often required at the ends of beam, slab, girder, tic beams etc.
129. 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 De to Die 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.
130. 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.
131. A simply supported beam of span 'L' carries a uniformly distributed load 'w'. The maximum moment 'M' is:
WL/2
WL/8
WL/4
WL/16
132. 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.
133. The walls which are necessary on the hill side of roadway where earth has to retained from-- slipping is knows as:
Retaining wall
Breast wall
Parapet wall
None of these
134. The main ingredients of Portland Cement are:
Lime and Silica
Lime and alumina
Lime and iron
Silica and alumina
ব্যাখ্যা: The chief chemical components of portland cement are calcium or lime and silica. The percentage of lime and silica are 63% and 22%. Lime is derived from lime stone and silica comes from the sands and clay.
135. The proportion of lime and sand in the mortar normally used in brick constructions are:
1:2
1:4
1:6
1:8
ব্যাখ্যাঃ Cao/lime is used for brick bond replacing cement. Here use 1 part lime and 2 part sand.
136. 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.
137. The ultimate tensile strength of 400 grade structural mild steel is about:
160 N/mm²
260 N/mm²
420 N/mm²
520 N/mm²
ব্যাখ্যা : Ultimate tensile strength = 60 grade 60 x 1000 145 Mpa = 413.80 N/mm²
138. 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.
139. Water content of soil can:
never be greater than 100%
be less than 50%
from 0 to 100%
be greater than 100%
140. Penetration test on bitumen is used to determine its:
Grade
Viscosity
Ductility
All of these
ব্যাখ্যা: Bitumen penetration test is a basic test for determining the grades of bitumen. Penetration test is used for evaluating consistency of bitumen.