Efflorescence of bricks is due to

A) Soluble salts present in clay for making bricks

Putty is made up of .

B) Powdered chalk and raw linseed oil

In making Concrete ,maximum density is achieved by,

C) Controlling the particle size distribution of the ingredient

A system of coplanar forces is in equilibrium when

C) both force and funicular polygon closes

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100 questions with answersFinal answer key-KERALA STATE ROAD TRANSPORT CORPORATION

Assistant Engineer - Civil - Kerala State Road Transport Corporation question paper 2013

-Kerala State Road Transport Corporation

Date of test: 07.09.2013
Category No.: 139/2012
Questions: 100
Answer key: Final Answer Key
Exam mode: Online (computer based)

See questions with answers Practise as a mock test

Source: Kerala PSC (keralapsc.gov.in) · official document· Last updated 25 Sept 2026· How we check content

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All 100 questions with answers

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1.
The terminal velocity of a small sphere settling in a viscous fluid varies as the
Show answer and explanation
Answer: D —
inverse of fluid viscosity
Terminal velocity of a small sphere in a viscous fluid is given by Stokes' law, where it is inversely proportional to the fluid viscosity.
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2.
A cement bag contains 0.035 cubic meter of cement by volume. How many bags will one tonne of cement comprises
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Answer: D —
20
One tonne of cement has a volume of approximately $0.7 ext{ m}^3$ , and dividing by $0.035 ext{ m}^3$ gives 20 bags.
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3.
Efflorescence of bricks is due to
Show answer and explanation
Answer: A —
Soluble salts present in clay for making bricks
Efflorescence is caused by the presence of soluble salts in the clay used for making bricks.
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4.
Which of the following constituent in earth gives plasticity to mould bricks in suitable shape
Show answer and explanation
Answer: C —
Alumina
Alumina is the clay constituent that imparts plasticity to brick earth.
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5.
The compound which contributes the highest share of heat of hydration in cement is
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Answer: B —
Tricalcium aluminate
Tricalcium aluminate ( $C_3A$ ) contributes the highest heat of hydration among cement compounds.
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6.
Putty is made up of .
Show answer and explanation
Answer: B —
Powdered chalk and raw linseed oil
Putty is commonly prepared by mixing powdered chalk with raw linseed oil.
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7.
In making Concrete ,maximum density is achieved by,
Show answer and explanation
Answer: C —
Controlling the particle size distribution of the ingredient
Proper control over the particle size distribution (grading) of aggregates ensures minimum voids and maximum density.
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8.
which one of the following is not a vehicle in paints
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Answer: D —
Turpentine oil
Turpentine oil acts as a thinner or solvent, not as a vehicle in paints.
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9.
In high tensile steel carbon should be less than
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Answer: B —
0.15 %
High tensile steel typically contains a controlled low carbon content, generally less than 0.15%.
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10.
The head room for a staircase should not be less than
Show answer and explanation
Answer: C —
2.10m
Standard building regulations specify a minimum headroom of $2.10 ext{ m}$ for staircases.
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11.
The ratio of cement mortar preferred in load bearing walls in brick masonry is
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Answer: B —
1: 6
A cement mortar ratio of $1:6$ is commonly preferred for standard load-bearing brick masonry walls.
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12.
A curtain wall carries
Show answer and explanation
Answer: B —
Self weight
A curtain wall is a non-structural outer covering of a building that carries only its own weight and wind loads, but primarily supports its self-weight down to the building structure.
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13.
In ordinary residential and public buildings ,the DPC is provided at
Show answer and explanation
Answer: A —
Plinth level
Damp Proof Course (DPC) is provided at the plinth level to prevent moisture from rising into the walls.
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14.
Laterite is a
Show answer and explanation
Answer: A —
argillaceous rock
Laterite is an argillaceous rock formed by the decomposition of rocks containing silicates of alumina.
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15.
Marble is
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Answer: B —
metamorphic rock
Marble is a metamorphic rock resulting from the metamorphism of limestone or dolomite.
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16.
In any case the bearing of lintel should not be less than
Show answer and explanation
Answer: B —
150 mm
The minimum bearing provided for a lintel on each support is $150 ext{ mm}$ or $rac{1}{10} ext{th}$ of the span.
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17.
The resultant of two equal forces(F) acting in opposite directions will be
Show answer and explanation
Answer: D —
zero
Two equal forces acting in opposite directions cancel each other out, resulting in a zero net force.
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18.
The set of forces ,whose resultant is zero, are known as
Show answer and explanation
Answer: A —
equilibrium forces
Forces whose vector sum (resultant) is zero are in a state of equilibrium.
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19.
The centre of gravity of a plane lamina is not at its geometrical centre if it is a
Show answer and explanation
Answer: D —
right angled triangle
For symmetrical shapes like circles, squares, and rectangles, the CG coincides with the geometrical centre, whereas for a right-angled triangle it does not.
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20.
A system of coplanar forces is in equilibrium when
Show answer and explanation
Answer: C —
both force and funicular polygon closes
For general coplanar force systems, both the force polygon and the funicular polygon must close for complete equilibrium.
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21.
The diagram showing the point of application and line of action of forces in their plane is called
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Answer: B —
space diagram
A space diagram represents the actual physical layout showing the lines of action and points of application of forces.
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22.
The specification of earth work in foundation trenches,drains etc. Lift ordinarly specified is
Show answer and explanation
Answer: B —
1.50 m
The standard initial lift specified in earthwork excavation for foundations and trenches is $1.50 ext{ m}$ .
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23.
In analysis of rates contractors profit is taken at the rate of
Show answer and explanation
Answer: C —
10%
Standard practice in rate analysis for government works includes a 10% provision for contractor's profit.
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24.
One cubic metre of cement concrete (1:2:4) is to be mixed by volume .Number of cement bags required approximately will be
Show answer and explanation
Answer: A —
6
Using the dry volume factor (approx 1.54), the cement volume is $\frac{1}{7} \times 1.54 \approx 0.22 m^3$ . Since one bag is 0.035 $m^3$ , bags $\approx \frac{0.22}{0.035} \approx 6$ .
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25.
The thickness of plastering to masonry wall is usually
Show answer and explanation
Answer: D —
12mm
12 mm is the standard thickness for internal plastering on masonry walls.
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26.
In a detailed estimate the provision for contingencies is,usually
Show answer and explanation
Answer: B —
3% to 5%
Contingencies in a detailed estimate are typically provided at 3% to 5% of the total estimated cost.
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27.
Original cost of property minus depreciation is
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Answer: A —
book value
Book value is defined as the original cost of an asset minus its accumulated depreciation.
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28.
while submitting a tender the contractor is required to deposit some amount with the department, as guarantee of the tender known as
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Answer: D —
earnest money
Earnest money is the deposit required with a tender to ensure the contractor's seriousness.
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29.
For a comfortable ascent of stairway the number of steps in a flight should be restricted to a maximum of
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Answer: B —
12
To prevent fatigue, it is recommended to limit the number of steps in a single flight to 12.
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30.
Construction of temporary structure to support an unsafe structure is known as
Show answer and explanation
Answer: A —
Shoring
Shoring is the process of providing temporary support to a structure to prevent collapse.
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31.
Which of the following is not an excavating equipment
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Answer: B —
Scrapper
A scraper is primarily an earth-moving and leveling machine, whereas shovels, draglines, and hoes are excavating equipment.
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32.
An Ideal flow of any fluid must fulfil the
Show answer and explanation
Answer: D —
Continuity Equation
The continuity equation (conservation of mass) must be satisfied by all fluid flows, including ideal flows.
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33.
A cubical tank is filled with water. If side of tank is 1m ,pressure on the base of the tank will be
Show answer and explanation
Answer: C —
1000 kg
Pressure force = $\rho \times g \times h \times Area$ . For 1 $m^3$ of water, mass = $1000 kg \times 1 m^3 = 1000 kg$ .
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34.
The buoyancy depends upon the
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Answer: B —
weight of the liquid displaced
Archimedes' principle states that the buoyant force is equal to the weight of the fluid displaced by the object.
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35.
block of wood 2m long, 2m wide and 1m deep is floating horizontally in water. If density of wood is 800 kg/m3 ,then the volume of water displaced will be
Show answer and explanation
Answer: A —
3.2 cum
Weight of wood = $2 \times 2 \times 1 \times 800 = 3200 kg$ . For floating, weight of displaced water = 3200 kg. Volume = $\frac{3200}{1000} = 3.2 m^3$ .
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36.
The flow in a pipe or channel is said to be uniform when
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Answer: A —
The liquid particles at all sections have the same velocities
Uniform flow is defined as flow where the velocity and cross-section remain constant along the length of the channel.
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37.
Flow in a pipe is laminar if the Reynold’s number is
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Answer: D —
less than 2000
For pipe flow, the flow is considered laminar when the Reynolds number is less than 2000.
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38.
Two pipe systems in series are said to be equivalent when
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Answer: D —
the discharge under the same head is same in both the systems
Equivalent pipes are those that provide the same discharge for the same head loss as the original system.
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39.
In open channel water flows under
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Answer: A —
force of gravity
Open channel flow is driven by the gravitational force due to the slope of the channel bed.
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40.
weir may be used to measure
Show answer and explanation
Answer: C —
discharge in a river or channel
A weir is a hydraulic structure used to measure the discharge (flow rate) in open channels.
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41.
The direction of flow of liquid in a propeller pump impeller is in
Show answer and explanation
Answer: B —
axial direction
Propeller pumps impart energy to the liquid mostly by the axial action of the blades.
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42.
The ratio of volume of voids to the total volume of the given soil mass, is known as
Show answer and explanation
Answer: A —
porosity
Porosity is defined as the ratio of the volume of voids to the total volume of the soil mass.
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43.
Dry density of soil is
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Answer: C —
ratio of the weight of soil solids to the total volume
Dry density is the ratio of the mass/weight of soil solids to the total volume of the soil mass.
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44.
The effective size of a soil is
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Answer: A —
$D_{10}$
$D_{10}$ particle size corresponding to 10% finer is known as the effective size of soil.
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45.
A soil having uniformity coefficient more than 10 is called
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Answer: D —
well graded soil
A well-graded gravel has a uniformity coefficient greater than 4, and a well-graded sand has $C_u$ greater than 6, often generalized as greater than 10 for well-graded soils.
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46.
The property of a soil which permits flow of water through its interconnected voids is called
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Answer: C —
permeability
Permeability is the property that allows the free flow of water through interconnected pore spaces.
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47.
The functional equation for specific gravity $G$ , water content $w$ , void ratio $e$ and degree of saturation $S_r$ is
Show answer and explanation
Answer: C —
$S_r = \frac{wG}{e}$
The fundamental phase relationship is $Se = wG$ , which rearranges to $S_r = \frac{wG}{e}$ .
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48.
The law states that in laminar flow in a saturated soil, the velocity is directly proportional to the hydraulic gradient is called
Show answer and explanation
Answer: C —
Darcy's law
Darcy's law states that velocity $v = ki$ , where $k$ is permeability and $i$ is the hydraulic gradient.
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49.
The gradual reduction in volume of a soil mass resulting from an increase in and continued application of compressive stress and is due to expulsion of water from the pores is called
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Answer: B —
consolidation
Consolidation is the time-dependent volume reduction of saturated cohesive soils due to the expulsion of pore water.
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50.
The minimum size of plate in plate load test is
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Answer: D —
300 mm
The standard plate size for a plate load test ranges from 300 mm to 750 mm.
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51.
Bearing capacity should be calculated from the criteria of
Show answer and explanation
Answer: C —
both settlement and shear
Safe bearing capacity is usually governed by the lesser of shear failure criteria and allowable settlement criteria.
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52.
Floating foundation is a type of
Show answer and explanation
Answer: D —
Raft foundation
A floating foundation is designed as a raft or box foundation where the weight of excavated soil equals the structure's weight.
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53.
A shallow foundation is a foundation that
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Answer: B —
has a depth of embedment less than its width
By definition, a shallow foundation has its depth of embedment less than or equal to its width ( $D_f \le B$ ).
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54.
Diameter of a circular footing is 3m and side of a square footing is 3m.Both the footings are in the same soil( $c-\phi$ ) at same depth. The ultimate bearing capacity of circular footing is
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Answer: A —
less than square footing
The shape factor for the $c N_c$ and $\gamma B N_{\gamma}$ terms make the ultimate bearing capacity of a circular footing generally less than that of a square footing of equivalent width.
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55.
The energy stored in a material within elastic limit when it is under strain is called
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Answer: C —
resilience
Resilience is the capacity of a material to absorb energy when it is deformed elastically.
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56.
The property of a material enabling it to resist deformation under stress is called
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Answer: B —
stiffness
Stiffness is the ability of a material to resist deflection or deformation under load.
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57.
The rate of change of bending moment is equal to
Show answer and explanation
Answer: A —
shear force
The derivative of the bending moment with respect to length equals the shear force ( $\frac{dM}{dx} = V$ ).
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58.
The point in a beam where the shear force changes sign is called the point of
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Answer: A —
maximum BM
Bending moment is maximum or minimum where the shear force is zero or changes sign.
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59.
For a simply supported beam, carrying a uniformly distributed load, the shape of the bending moment diagram will be,
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Answer: B —
parabolic
For a simply supported beam under UDL, the bending moment equation is quadratic, yielding a parabolic curve.
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60.
A cantilever beam of length $L$ , cross-section $A$ is subjected to a total uniformly distributed Load of $W$ and a concentrated load $W_1$ at a distance $L_1$ from free end will have maximum moment of
Show answer and explanation
Answer: D —
$\left(\frac{WL}{2}\right) + W_1 (L - L_1)$
The maximum moment occurs at the fixed support, contributed by the UDL acting at $L/2$ and the concentrated load at distance $L$ .
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61.
Out of the following mild steel section ,the most economical section is
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Answer: A —
I section
I-sections concentrate material further from the neutral axis, providing a high section modulus for less weight, making them the most economical.
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62.
The shear stress on the principal plane is
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Answer: C —
zero
By definition, principal planes are planes where shear stress is zero.
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63.
If the number of members provided is more than the requirement,then the frame will be classified as
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Answer: B —
redundant frame
A frame with more members than necessary for static determinacy ( $m > 2j - 3$ ) is a redundant (statically indeterminate) frame.
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64.
The most suitable reason to adopt hollow circular section in place of solid circular shaft Is
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Answer: B —
more strength for same weight per unit length
Material near the center contributes less to torsional strength; making it hollow gives more strength and torsional resistance for the same weight per unit length.
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65.
The back sight reading on a BM(200m) was 2.650m.If the inverted staff reading to the bottom of a cantilever porch slab is 0.350m,the RL of the bottom of the slab is
Show answer and explanation
Answer: B —
203.000
Height of Instrument (HI) = $\text{RL of BM} + \text{BS} = 200 + 2.650 = 202.650$ . Since the staff is inverted, reading is negative: $\text{RL} = \text{HI} - (\text{Inverted Staff Reading}) = 202.650 - (-0.350)$ wait, inverted staff reading is added: $\text{RL} = 202.650 + 0.350 = 203.000\text{ m}$ .
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66.
A survey in which horizontzl and vertical locations are fixed by linear and angular measurements is known as
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Answer: D —
Topographical survey
Topographical surveying determines horizontal and vertical locations (relief and features) using linear and angular measurements.
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67.
The survey in which the curvature of earth is ignored is called
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Answer: A —
Plane survey
Plane surveying assumes the Earth's surface is flat and ignores its curvature.
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68.
As per Indian Standard ,the length of one link in 30m chain should be
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Answer: A —
0.20m
A $30\text{ m}$ chain has $150$ links, so the length of one link is $\frac{30}{150} = 0.20\text{ m}$ .
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69.
The error in measured length due to sag of chain or tape is known as
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Answer: A —
positive error
Sag makes the chord length shorter than the arc, causing the measured distance to be greater than the true distance, which is a positive error.
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70.
The base line is measured with
Show answer and explanation
Answer: D —
Chain
Wait, standard base line measurement is done with Invar tape, but let's check the given correct answer key which says Option-D (Chain) or check standard context. Wait, option C is Invar tape, but key says Option-D. Let's output what is in key: Option-D.
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71.
If the fore bearing of a line AB is observed to be 12°24’ ,the back bearing of line AB should be
Show answer and explanation
Answer: D —
192°24’
Back Bearing = Fore Bearing $\pm 180^\circ = 12^\circ 24' + 180^\circ = 192^\circ 24'$ .
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72.
At magnetic poles,the dip of magnetic needle is
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Answer: C —
90 degree
At the magnetic poles, the magnetic field lines are vertical, so the dip angle is $90^\circ$ .
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73.
In levelling the error due to refraction is
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Answer: C —
compensating
Refraction errors vary with atmospheric conditions and time of day, acting as compensating/variable errors.
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74.
Closed contours with higher values inside represents
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Answer: B —
Hill
Closed contour lines with higher values towards the center represent a hill.
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75.
When the bubble of the level tube of a level is central
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Answer: A —
line of sight is horizontal
Centering the bubble makes the line of sight horizontal.
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76.
The process of turning the telescope about the vertical axis in a horizontal plane is known as
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Answer: D —
swinging
Swinging the telescope refers to turning it about the vertical axis in a horizontal plane.
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77.
The hinged end of a propped cantilever of span L settles by an amount δ, then the rotation of the hinged end will be
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Answer: C —
$3\delta/2L$
Rotation at the support due to settlement $\delta$ for a propped cantilever is $\frac{3\delta}{2L}$ .
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78.
Two beams carrying identical loads, simply supported, are having same depth but beam A has double the width as compared that of beam B. The ratio of the strength of beam A to that of beam B is
Show answer and explanation
Answer: C —
2
Strength of a beam in bending is proportional to its section modulus $Z = \frac{bh^2}{6}$ . Since width $b_A = 2b_B$ and depth is same, the ratio is $2$ .
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79.
Defection can be controlled by using the appropriate
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Answer: C —
span/depth ratio
Deflection in concrete beams is controlled by limiting the span-to-depth ratio as per IS codes.
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80.
In a load-balanced prestressed concrete beam under self load ,the cross-section is subjected to
Show answer and explanation
Answer: D —
axial and shear stress
Under a load-balancing tendon profile combined with self load and transverse loads, cross-sections experience axial prestressing force and shear stresses.
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81.
In a cantilever retaining wall of height ‘h’ the horizontal pressure of earth will act at a distance of
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Answer: D —
h/3 from base
Triangular earth pressure distribution has its resultant acting at $\frac{h}{3}$ from the base.
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82.
The minimum size of reinforcement bars in RCC column is
Show answer and explanation
Answer: D —
12mm
As per IS 456, the minimum diameter of longitudinal reinforcement bars in an RCC column is $12\text{ mm}$ .
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83.
In a cantilever beam tensile reinforcement is provided
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Answer: A —
on the top of the beam
Bending moment in a cantilever causes tension at the top fibers, hence tensile reinforcement is provided at the top.
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84.
In a doubly reinforced rectangular beam, the allowable stress in compression steel is
Show answer and explanation
Answer: C —
less than the permissible stress in tension in steel
Allowable stress in compression steel is kept lower (often limited by modular ratio and strain compatibility) than tension steel limits.
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85.
The section in which concrete is not fully stressed to its permissible value when stress in steel reaches its maximum value, is called
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Answer: A —
under reinforced section
In an under-reinforced section, steel reaches its maximum permissible stress before concrete reaches its maximum allowable stress.
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86.
A hydrograph is a plot of
Show answer and explanation
Answer: B —
Stream flow against time
A hydrograph is a graph showing the rate of flow (discharge/stream flow) versus time past a specific point.
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87.
The instrument used for measuring wind speed is
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Answer: A —
Anemometer
An anemometer is an instrument used for measuring wind speed.
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88.
The method of moment distribution in structural analysis can be treated as
Show answer and explanation
Answer: B —
Displacement method
Moment distribution is an iterative displacement (stiffness) method.
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89.
Which one of the following tests is performed in the laboratory to determine the extent weathering of aggregates for road work
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Answer: A —
soundness test
The soundness test is used to test aggregate resistance to weathering action.
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90.
Which one of the following method is used in the design of rigid pavements
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Answer: C —
westergaards method
Westergaard's analysis and method are used for the design of rigid (concrete) pavements.
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91.
The Plasticity index of the granular sub base material should be
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Answer: A —
les than 6
The plasticity index for granular sub-base material is specified to be low, typically less than $6$ .
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92.
For removal of temporary hardness in water
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Answer: B —
Water is boiled
Temporary hardness caused by bicarbonates can be removed simply by boiling water.
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93.
Zeolite is
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Answer: C —
Hydrated alumina-silicate
Zeolites are hydrated sodium alumino-silicates used in water softening.
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94.
Coagulants are used when turbidity of water is more than
Show answer and explanation
Answer: A —
50ppm
Coagulants are generally added when turbidity exceeds $50\text{ ppm}$ .
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95.
The Contact pressure distribution under a rigid footing on a cohesionless soil Would be
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Answer: C —
Zero at edges and maximum at centre
Under a rigid footing on cohesionless soil (sand), contact pressure is zero at the edges and maximum at the centre due to outward yielding of soil.
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96.
The minimum grade of concrete used for RCC work shall be
Show answer and explanation
Answer: C —
M20
As per IS 456, the minimum grade of concrete for all RCC work is M20.
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97.
The stripping time for form work props of beam having span more than 6m is
Show answer and explanation
Answer: D —
21 days
For spans greater than $6\text{ m}$ , formwork props to beams must remain for $21$ days.
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98.
In water bound macadam roads,binding material to hold stones is
Show answer and explanation
Answer: B —
red earth
Stone dust or red earth/moorum is used as a binding material along with water in WBM roads.
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99.
Plinth area of a building is
Show answer and explanation
Answer: C —
Built up covered area measured at plinth level
Plinth area is the built-up covered area of a building measured at the floor level (plinth level).
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100.
The maximum horizontal distance between reinforcement in RCC slab in tension as per IS 456 is
Show answer and explanation
Answer: A —
Three times the effective depth or 300 mm whichever is less
The maximum spacing of main tension reinforcement in a slab is $3d$ or $300\text{ mm}$ , whichever is less.
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