Engineering Questions with Answers - Multiple Choice Questions
Strength of Materials MCQs Kernel of a Section
1 - Question
The approximate percentage of steel taken for lintels in the absence of detailed design is _______
a) 0.6-1%
b) 0.5-0.7%
c) 0.7-1%
d) 0.8-1.2%
View Answer
Answer: c
Explanation: RCC work maybe in foundations, columns, lintels, beams, floor& slabs the estimate is prepared in cubic metres. In absence of detailed design, the percentage of steel reinforcement is taken for lentils 0.7 to 1% and foundation raft footing it is 0.5 to 0.8%.
2 - Question
Mix proportion for M20 grade mix is _________
a) 1:3:6
b) 1:1.5:3
c) 1:4:8
d) 1:5:10
View Answer
Answer: b
Explanation: Mix proportion for M20 grade mix is 1:1.5:3.
Grade of concrete Mix proportionate
M10 1:3:6
M15 1:2:4
M20 1:1.5:3
3 - Question
The limit state corresponding to deflection, cracking and vibrations are _______
a) Limit state of collapse
b) Limit state of serviceability
c) Special limit state
d) Limit state of safety
View Answer
Answer: b
Explanation: Limit state of serviceability refers to the ability of the structure at working loads it is the state of limit at which the structure undergoes heavy deflection which affects the finishes casting discomfort to the users.
4 - Question
In reinforcing of Steel bars, the end and side covers are taken as ____________ to ____________ mm.
a) 40 to 50mm
b) 30 to 45mm
c) 50 to 75mm
d) 35 to 50mm
View Answer
Answer: a
Explanation: For reinforcement of Steel bars, the end and side covers are taken as 40 to 50 mm and the bottom and top covers 12 to 20 mm for slab and 25 to 50 mm for beams.
5 - Question
The field capacity of a soil depends upon _____________ factor.
a) Porosity of soil
b) Soil Tension
c) Saturation capacity
d) Initial regime
View Answer
Answer: a
Explanation: The maximum amount of water content which can be held by soil particles against the force of gravity is called as field capacity. It is the upper limit of the capillary rise of water. It firmly depends on the porosity of soil.
6 - Question
According to Fannings formula the flood discharge in cumecs is given by Q = ______________
a) CA2/3
b) CA3/4
c) CA5/6
d) CA7/8
View Answer
Answer: c
Explanation: The emperical formula for flood discharge given by various scientists is
i. Dicken’s – CA3/4
ii. Rvye’s – CA2/3
iii. Fannings – CA5/6.
7 - Question
The estimate of flood can be made by using ____________
a) Arithmetical increase method
b) Geometrical increase method
c) By unit hydrograph method
d) Comparison with graph method
View Answer
Answer: c
Explanation: The estimation of a flood can be made by
i. Flood discharge formula
ii. By physical indication of past flood
iii. By unit hydrograph.
8 - Question
In simply supported slabs, alternate bars are curtailed at ________
a) 1/7 of span
b) 1/5 of span
c) 1/3 of span
d) 1/6 of span
View Answer
Answer: d
Explanation: In simply supported beam at least 50% off bus shall extend into the support for a length of 1/3 of development length from the face of the support and the remaining alternate bars are curtailed at one sixth of span.
9 - Question
The length of the staircase between two consecutive landings is called _______
a) Tread
b) Flight
c) Rise
d) Effective width
View Answer
Answer: b
Explanation: Stairs provide access for the various floors in a building. The stairs comprises series of steps with landings at appropriate intervals. The stretch between the two landings may be termed as a flight.
10 - Question
________ is used in the entrance of cinema theatres and shopping malls.
a) Open well stair case
b) Dog legged stair case
c) Geometrical stair case
d) Single flight stair case
View Answer
Answer: c
Explanation: It is based on geometrical shape. The staircase is aesthetically superior compared to other types and generally used in the entrance of cinema theatres and shopping malls. This is mostly adopted in congested areas for good accessibility and proper ventilation.
11 - Question
In the design of lintel, determine the base angle of a triangle for poor masonry.
a) 40°
b) 45°
c) 60°
d) 90°
View Answer
Answer: c
Explanation: It is assumed that the load of triangle portion of the masonry is considered to act on the lintel. The base angle of the triangle depends upon the quality of brick masonry used. It may be taken as 45°for good masonry and 60° for poor masonry.
12 - Question
Calculate the height of the equilateral triangle in the design of lintel, if the masonry used is poor graded. Take effective span as 1.29 m.
a) 1.334m
b) 1.433m
c) 1.117m
d) 1.125m
View Answer
Answer: c
Explanation: Taking 60° [As masonry is of poor quality] Then height of equilateral triangle (h) = l × sin 60 °
= 1.29 × sin 60 °
= 1.117m.
13 - Question
For a simply supported beam, the basic l/d ratio should be ____________
a) 20
b) 22
c) 16
d) 30
View Answer
Answer: a
Explanation: If the beam is being checked for deflection criteria, the basic values of l/d ratio of various beams should be
1. For Simply supported beam – 20
2. for cantilever beam – 7
3. for continuous beam – 26.
14 - Question
A beam of clear span 6 metres is supported on bearings of 150 mm if the effective depth of a beam is 400 mm. calculate the effective span.
a) 6.4m
b) 6.15m
c) 6.0m
d) 6.3m
View Answer
Answer: b
Explanation: For calculation of effective span, the least of below values should be adopted:
1. Clear span + d = 6 + 0.4 = 6.4m
2. Clear span + bearings/2 + bearings/2 = 6+0.15/2+0.15/2 = 6.15m
The least of the above values is 6.15 metres. Hence effective span is 6.15 m.
15 - Question
The final deflection of horizontal members will be the level of casting should not exceed _____________
a) Span/500
b) Span/250
c) Span/300
d) Span/350
View Answer
Answer: b
Explanation: The serviceability requirement for deflection should be such that final deflection of horizontal members below the level of casting should not exceed span / 250. This is the reason that the user can’t notice the deflection. The deflection taking place after construction of partitions should not exceed span / 350 or 20 mm whichever is less.
16 - Question
Strength of Materials MCQs Dams
The obstruction or a barrier built across the stream or river is called _____________
a) Barrage
b) Weir
c) Dam
d) Reservoir
View Answer
Answer: c
Explanation: A dam may be defined as an obstruction or a barrier built across the stream or river these are artificial storage works. It retains water to create an impounding reservoir.
17 - Question
FTL Stands for ________
a) Free tank level
b) Full tank level
c) Full top level
d) Fill toe level
View Answer
Answer: b
Explanation: It is also called a full reservoir level (FRL). It is a level up to which the water stored obviously the crest of the spillway is fixed at this level.
18 - Question
_______ is openings extending from upstream to downstream of the dam.
a) Guide banks
b) Divide voids
c) Sluices
d) Spillway
View Answer
Answer: c
Explanation: Sluices are openings or conduits extending from upstream face of the dam to downstream face of the dam. They are used to clean the silt from the reservoir. They also decrease the peak flood in the reservoir.
19 - Question
Water stored in dam is expressed in _______
a) Mega cumec metres
b) Million cubic metres
c) Metric cumec
d) Million cusec metres
View Answer
Answer: b
Explanation: It is the total quantity of water stored up to FRL. It includes dead storage also. It is expressed generally in thousand hectare metre or million cubic metres (Mm3).
20 - Question
MDDL Stands for ________
a) Minimum draw down level
b) Maximum draw down level
c) Million drop down level
d) Mega drop down level
View Answer
Answer: a
Explanation: It is the lowest level up to which the reservoir is depleted from the considerations of hydropower generation. So this level is known as minimum draw down level (MDDL).
21 - Question
_____ dam which resists are the external forces by virtue of its self weight.
a) Earthen dam
b) Storage dam
c) Detention dam
d) Gravity dam
View Answer
Answer: d
Explanation: A gravity dam is that, which is stable against all the external forces achieved by the weight of the dam itself. This is the most permanent one and hence it is very commonly used. It may be constructed in all localities.
22 - Question
The factor of safety against overturning should not be less than ______
a) 1.8
b) 2.25
c) 1.5
d) 1.75
View Answer
Answer: c
Explanation: In the dam section, the overturning takes place when a resultant force cuts the base of the dam downstream of the toe. The factor of safety against overturning is the ratio of the stabilizing moment to the overturning moments. The safety against overturning should not be less than 1.5.
23 - Question
In sliding failure, the co-efficient of friction varies from ________
a) 0.65 – 0.75
b) 0.8 – 0.9
c) 0.45 – 0.65
d) 0.85 – 1
View Answer
Answer: a
Explanation: To avoid sliding, the factor of safety against the sliding should be greater than 1.
F.S = M(V-U) / €H > 1
Where M = Co-efficient of friction. It varies from 0.65 to 0.75
V = Total vertical force
U = Upward force.
24 - Question
Which of the following forces do not act on the dam?
a) Silt pressure
b) Wave pressure
c) Creep pressure
d) Uplift
View Answer
Answer: c
Explanation: Among the above forces, creep pressure does not act on the dam. Generally on gravity dam number of forces such as water pressure, wave pressure, wind pressure, ice pressure etc. will be acting in a horizontal direction. In the same way, uplift, self weight acts in vertical direction.
25 - Question
The elementary profile of a dam is generally a ________
a) Isosceles triangle
b) Right angled triangle
c) Scalene triangle
d) Equilateral triangle
View Answer
Answer: b<br/>
Explanation: In the absence of any other forces, the forces due to water and self weight of the dam form an elementary profile which will be in triangular section having zero top width at water level, where the pressure is zero and maximum base width is at bottom where the maximum water pressure acts.
26 - Question
_____ acts as an inspection chamber in Dams.
a) Spillway
b) Heel
c) Drainage gallery
d) Toe
View Answer
Answer: c
Explanation: A drainage gallery is an opening in the body of a dam which runs longitudinally. It runs through the length of the dam. Generally, it is a rectangle shape with flat a semi-circular head usually 1.5 m wide and 2.5m height.
27 - Question
The minimum standard height for a construction joint is about ________
a) 1.2 m
b) 1.5 m
c) 2.1 m
d) 2.3 m
View Answer
Answer: b
Explanation: The joints which facilitate construction of the dam to proceed in small lifts. These joints are also known as horizontal joints. A lift may be defined as the vertical distance between two consecutive construction joints. The height is about 1.5 m each.
28 - Question
Cracks developed in the body of dam section can be avoided by ________
a) Construction joints
b) Contraction joints
c) Transverse joints
d) Longitudinal joints
View Answer
Answer: b
Explanation: Due to variation in temperature it causes contraction and expansion in masonry or concrete of the dam. It will develop fine cracks in the body of the dam. By providing contraction joints, these cracks can be avoided.
29 - Question
______ is the over flow section or portion of the dam.
a) Heel
b) Toe
c) Spillway
d) Gallery
View Answer
Answer: c
Explanation: A spillway is the overflow section or portion of the dam over which surplus discharge flows from reservoir to downstream face. This structure is provided in the body of the dam or near the dam or on the periphery of the reservoir.
30 - Question
_______ is the common type of spillway used in gravity dams.
a) Ogee spillway
b) Trough spillway
c) Side channel spillway
d) Emergency spillway
View Answer
Answer: a
Explanation: An ogee spillway is very common type of spillway used in gravity dams. It consists of two parts namely ¡)ogee crest and ¡¡) a bucket. In this spillway water spills and flows over and ogee crest in the form of a rolling sheet of water. Due to this, the development of negative pressures can be avoided.
31 - Question
Strength of Materials MCQs Rectangular Dam
Which of the following is not a failure of a rectangular dam?
a) Overturning
b) Toe erosion
c) Sliding
d) Foundation failure
View Answer
Answer: b
Explanation: Among the above failures, the toe erosion is not related to rectangular dams. Toe erosion is caused due to in some cases the spillway is constructed very near to the dam section inside circumstances the discharge water may erode the dam.
32 - Question
Structural failures contribute about _______________ in the failure of dam.
a) 45%
b) 60%
c) 30%
d) 20%
View Answer
Answer: c
Explanation: About 30% of failures are due to:
i. Foundation slide
ii. Upstream slope failure
iii. Downstream slope failure
iv. Failure due to flow slide.
33 - Question
The free board is provided in dams to avoid _______________
a) Piping
b) Foundation of upstream
c) Wave erosion
d) Overtopping
View Answer
Answer: d
Explanation: By providing sufficient free board and by providing an adequate capacity of the spillway, failure due to overtopping of the damn can be avoided.
34 - Question
By providing ______________ gully formation can be avoided.
a) Berms
b) Aqueduct
c) Spillway
d) Free board
View Answer
Answer: a
Explanation: By providing berms and turning on the downstream face of the dam, the failure due to the formation of the gullies can be avoided.
35 - Question
The maintenance of the reservoirs, above _____________ Ha comes under irrigation department.
a) 30
b) 40
c) 50
d) 60
View Answer
Answer: b
Explanation: The maintenance of reservoirs is having commendable area below 40Ha comes under Panchayat Raj department and above 40 Ha come under irrigation department.
36 - Question
Which of the following process will you prefer to prevent the leakage of water in the dam foundation?
a) Guniting
b) Grouting
c) Gam mixing
d) Filling
View Answer
Answer: b
Explanation: Grouting is a process in which a grout in liquid (8:1) slurry form, is injected into the soil under suitable pressures and applied through the pipes.
37 - Question
______ grouting increases the bearing capacity of soil.
a) Curtain
b) Consolidated
c) Blanket
d) Descending stage grouting
View Answer
Answer: b
Explanation: According to functions served, the groutings can be classified into
i. Consolidated grouting
ii. Curtain grouting
iii. Area grouting
Consolidation grouting increases the bearing capacity of the soil and creates proper bonding between separated bodies.
38 - Question
According to IS, the specific gravity of a good building stone used in heavy dams should be ______
a) 2.2 – 2.4
b) 2.3 – 2.5
c) 2.4 – 2.8
d) 2.6 – 3
View Answer
Answer: c
Explanation: The stones used for heavy irrigation works such as dams, bridges, check dams, weirs, docks should have specific gravity between 2.4 to 2.8. Stones used for the roof may have less specific gravity.
39 - Question
Hardness can be measured using _______
a) Mohr’s scale
b) Silica scale
c) Dalton’s scale
d) Abrasion factor
View Answer
Answer: a
Explanation: The property to resist the abrasive forces cause due to wear & tear and friction is called hardness. It is determined by the Mohr’s scale of hardness in a laboratory. A hard stone will not show any scratches.
40 - Question
Granite has been widely used for dams construction because of _______
a) Crushing strength
b) Cost
c) Workability
d) Porosity
View Answer
Answer: a
Explanation: Granite stone is derived from igneous rocks. It is very hard, durable and strong. Its crushing strength is 100 to 140 N/mm^2. For this property, it is widely used in all important works.
41 - Question
The range of slenderness ratio in dams varies from ________
a) 13 – 15
b) 12 – 15
c) 15 – 18
d) 15 – 20
View Answer
Answer: b
Explanation: In dams, the slenderness ratio can be calculated through
= Height of buttress / Thickness of buttress
• It varies from 12 to 15.
42 - Question
_______ is provided for installation of control equipment of valves in dams.
a) Vertical shafts
b) Hydraulic openings
c) Connecting passages
d) Isolated chambers
View Answer
Answer: d
Explanation: Isolated chambers are provided for installation of control equipment of walls or pipeline or pumps. The function is to supply water to irrigation canals, fulfilling commitments and desilting the reservoir.
43 - Question
The ratio of the volume of voids to the volume of given soil mass is __________
a) Porosity
b) Void ratio
c) Dry density
d) Specific gravity
View Answer
Answer: a
Explanation: The porosity of a given soil sample is the ratio of the volume of voids to the value of given soil mass. It is denoted by “n”.
n = Vu / V.
44 - Question
Sand layer is an example of ______________
a) Aquiclude
b) Aquifuge
c) Aquitard
d) Aquifer
View Answer
Answer: d
Explanation: An aquifer is a geologic formation (or) saturated bed which contains water and yields them significantly. Example: sand bed. They permit the appreciable quantity of water under ordinary field conditions.
45 - Question
________ keeps the phreatic line within the dam section.
a) Longitudinal filter
b) Cross filter
c) Rock toe
d) Toe drain
View Answer
Answer: c
Explanation: Rock toe keeps the phreatic line within the damn section and also facilitates drainage. It is nothing but a downstream portion of a dam made of graded material. To achieve good results, the height of rock toe shall be kept 1/3 to 1/ 4 of dam height.
46 - Question