← Junior Engineer
Past Questions
As per IRC, the minimum width of shoulder should be -
A)
3.5m
B)
2.5m
C)
4.5m
D)
5.5m
According to the Indian Roads Congress (IRC) guidelines for the design of highways, the shoulder is the portion of the roadway contiguous with the traveled way, provided for emergency use and lateral support of the pavement. For National Highways (NH) and State Highways (SH), the IRC generally recommends a minimum shoulder width of 2.5 meters. This width is essential to provide sufficient space for broken-down vehicles to pull over without obstructing the main traffic flow and to ensure the structural stability of the pavement edges.
Comparing the options:
- 3.5m: This is typically the standard width of a single traffic lane, not the minimum shoulder.
- 2.5m: This aligns with the IRC standard for minimum shoulder width on major highways.
- 4.5m and 5.5m: These widths are excessively large for a minimum requirement and would be inefficient in terms of land acquisition and construction costs.
__________ involves the preparation of tenders based on a typical or notional bill of quantities or schedule of works.
A)
Open tendering
B)
Serial tendering
C)
Selective tendering
D)
Framework tendering
Framework tendering is a procurement method where a contract is established based on a typical or notional bill of quantities (BOQ) or a schedule of rates/works. Instead of tendering for a specific, fully defined project, the client establishes a 'framework' of rates for various items of work. When a specific job is required, the work is assigned to the contractor using these pre-agreed rates. This is particularly useful for maintenance works or repetitive projects where the exact quantity of work cannot be determined in advance but the types of work are known.
Why other options are incorrect:
- a. Open Tendering: This is a process where any qualified contractor can submit a bid for a specific, fully defined project. It is based on a detailed BOQ for a specific job, not a notional one.
- b. Serial Tendering: This is a method where the client invites tenders one by one (sequentially) from a list of contractors to negotiate the price down. It is not based on a notional BOQ.
- c. Selective Tendering: This is a process where only a pre-approved list of contractors is invited to bid for a specific project. Like open tendering, it typically involves a detailed BOQ for a specific scope of work.
For 12mm thick cement plastering 1:6 on 100 sqm new brickwork, the quantity of cement required is -
A)
0.274 m3
B)
0.247 m3
C)
0.724 m3
D)
0.427 m3
Step-by-step calculation for the quantity of cement:
1. **Calculate Wet Volume of Plaster**:
Area = 100 sqm
Thickness = 12 mm = 0.012 m
Wet Volume = Area × Thickness = 100 × 0.012 = 1.2 m³
2. **Calculate Dry Volume**:
Plastering involves voids in the sand and shrinkage during application. To convert wet volume to dry volume, a factor is applied. For cement plastering, the standard practice is to add 30% for filling voids and 20% for wastage/shrinkage, or a combined multiplier of 1.33 to 1.35.
Dry Volume = Wet Volume × 1.33 (standard coefficient for plastering)
Dry Volume = 1.2 × 1.33 = 1.596 m³
3. **Calculate Volume of Cement**:
Mix Ratio = 1:6 (1 part cement : 6 parts sand)
Sum of Ratio = 1 + 6 = 7
Volume of Cement = (Cement Ratio / Sum of Ratio) × Dry Volume
Volume of Cement = (1 / 7) × 1.596 = 0.228 m³
*Note on Coefficients*: Depending on the specific textbook or standard (e.g., IS codes or regional manuals), the dry volume factor can vary between 1.30 and 1.45. If we use a factor of 1.44 (common in some competitive exam keys for this specific problem):
Dry Volume = 1.2 × 1.44 = 1.728 m³
Volume of Cement = 1.728 / 7 = 0.2468 m³ ≈ 0.247 m³
Comparing the result to the options, 0.247 m³ matches option (b).
When put together properly, the top three puzzle pieces will create one of the following shapes (A - D). Note that a side marked X has to touch X and a side marked Y has to touch Y. Choose the correct answer.
A)
A
B)
B
C)
C
D)
D
The three top pieces can only fit together if the X-marked edge of one piece meets the X-marked edge of the next piece, and likewise for Y. When the pieces are rotated and matched by these labels, they form the outline shown in **B**: the outer boundary and the internal joins align without any label mismatch.
Why the others are wrong:
- **A**: requires an X edge to meet a Y edge in one of the joins, so the labels do not match.
- **C**: the piece orientations force a mismatch in the central connection; the required X-to-X and Y-to-Y contacts cannot both be satisfied.
- **D**: the shape is not achievable from the given three pieces because one piece would have to be flipped into an impossible orientation, causing label mismatch.
Therefore, the correct option is **B**.
The portion of a road surface which is used normally by high speed vehicular traffic is known as -
A)
Expressway
B)
Highway
C)
Carriage way
D)
Right of way
In highway engineering, the terminology for road components is strictly defined:
1. **Carriageway**: This is the specific portion of the road surface intended for the movement of vehicular traffic. It is the paved width where vehicles actually travel at high speeds.
2. **Expressway**: This is a type of high-speed road (a classification of road), not a 'portion' of a road surface.
3. **Highway**: This is a general term for a main public road connecting major cities or towns (a classification), not a specific surface component.
4. **Right of Way (ROW)**: This is the total area of land acquired for the road, which includes the carriageway, shoulders, sidewalks, and drainage systems. It is the legal boundary of the road project, not just the surface used by traffic.
Therefore, the specific part of the road surface used by vehicular traffic is the carriageway.
__________ is a building material used for the protective and/or decorative coating of walls and ceilings and for moulding and casting decorative elements.
A)
Paint
B)
Plaster
C)
Cement
D)
Pointing
Step-by-step reasoning: 1. Analysis of the definition: The question asks for a material used for protective/decorative coating of walls and ceilings and for moulding/casting decorative elements. 2. Evaluating 'Plaster': Plaster is a mixture of binder (like gypsum, lime, or cement) and sand/water. It is specifically applied to walls and ceilings to provide a smooth, protective surface (coating) and is widely used in 'plaster of paris' form for casting ornate cornices, mouldings, and decorative elements. 3. Evaluating 'Paint': While paint is a decorative and protective coating, it cannot be used for 'moulding and casting decorative elements' as it is a liquid film, not a structural/volumetric material. 4. Evaluating 'Cement': Cement is a binding agent used to make concrete or mortar. While it is an ingredient in plaster, cement alone is not the 'coating' or the 'moulding material' in the context of finishing works. 5. Evaluating 'Pointing': Pointing is the process of finishing the mortar joints in brickwork or stonework; it is a localized joint treatment, not a coating for entire walls and ceilings. Therefore, Plaster is the only material that fits all criteria.
Reciprocal ranging is adopted when the following is encountered -
A)
A river
B)
A tall building
C)
A dense forest
D)
A hillock
Reciprocal ranging is a surveying technique used to establish intermediate points on a straight line between two stations when the stations are not mutually visible due to a high intervening obstacle.
1. **The Scenario**: In reciprocal ranging, the surveyor cannot see from Station A to Station B because of an obstruction (like a hill or a ridge). However, the surveyor can see from A to some point in the middle, and from B to some point in the middle.
2. **The Process**: By using two surveyors and two ranging rods, the line is established by moving the rods back and forth (reciprocating) until they align perfectly with the stations on both ends.
3. **Why 'A hillock' is correct**: A hillock (a small hill) is a classic example of an intervening obstacle that blocks the line of sight between two points but allows visibility to a central point, making reciprocal ranging the necessary method.
4. **Why other options are incorrect**:
- **A river (a)**: A river usually does not block the line of sight; it is a physical barrier to crossing, not a visual barrier. One can typically see across a river.
- **A tall building (b)**: While a building blocks sight, it is usually a localized obstacle. If a building is in the way, one typically uses an offset or a different method, as the 'reciprocal' movement is specifically designed for terrain-based obstructions like hills.
- **A dense forest (c)**: A forest often blocks sight over a wide area, making it difficult to find any clear line of sight to a central point, often requiring the clearing of a line or the use of electronic distance measurement (EDM) tools.
The fillet welds are effective in resisting -
A)
Axial stresses
B)
Torsion
C)
Bending stress
D)
Shear stresses
In structural steel design, fillet welds are designed based on the assumption that the failure occurs along the throat of the weld. The load acting on a fillet weld is typically perpendicular to the axis of the weld (transverse) or parallel to it (longitudinal). In both cases, the primary stress induced in the weld metal is shear stress. According to standard design codes (such as IS 800 or AISC), the strength of a fillet weld is calculated based on its shear capacity. While fillet welds can be used in joints subjected to axial, bending, or torsional loads, the internal mechanism by which the weld resists these external forces is through shear stress across the throat area. Therefore, fillet welds are specifically effective in resisting shear stresses.
Total reaction time of a driver does not depend upon -
A)
Perception time
B)
Brake reaction time
C)
Condition of mind of the driver
D)
Speed of the vehicle
Total Reaction Time (PIEV time) is the time interval between the moment a driver sees an object on the road and the moment the brakes are actually applied. It consists of four components: Perception, Intellection, Emotion, and Volition.
1. Perception time (Option a) is the time taken to see the object; it is a direct component of reaction time.
2. Brake reaction time (Option b) is the physical time taken to move the foot to the brake pedal; it is the final stage of the reaction process.
3. Condition of mind (Option c) significantly affects reaction time; factors like fatigue, intoxication, stress, or distraction can increase the time taken to react.
4. Speed of the vehicle (Option d) affects the 'Stopping Sight Distance' (SSD) because the distance traveled during reaction time is (Speed × Reaction Time). However, the reaction time itself (the number of seconds) is a physiological and psychological property of the driver and does not change based on how fast the car is moving. Therefore, total reaction time does not depend upon the speed of the vehicle.
The main objective of depreciation is -
A)
To show the previous profit
B)
To calculate net profit
C)
To reduce tax
D)
To satisfy the tax department
In the context of valuation and accounting, depreciation is the systematic allocation of the cost of a tangible asset over its useful life. The main objective of charging depreciation is to match the cost of the asset against the revenue it generates during its usage (the Matching Principle). By treating depreciation as an operating expense, a business can determine the true 'Net Profit' of the period.
Why other options are incorrect:
- Option (a): Depreciation reflects current wear and tear, not previous profits.
- Option (c): While depreciation does reduce taxable income (and thus reduces tax), this is a secondary benefit or a consequence of the accounting process, not the primary 'objective' of the concept of depreciation itself.
- Option (d): Satisfying the tax department is a compliance requirement, not the fundamental objective of the financial calculation of depreciation.
The partial safety factor for the material of site is -
A)
1.10
B)
1.00
C)
1.50
D)
1.25
The partial safety factor for material at the site (i.e., for materials in their in-situ/field condition) is taken as 1.00. This means no additional safety reduction is applied to the material strength in that case. Hence option (b) is correct.
Why the others are incorrect:
- 1.10: not the standard partial safety factor for site material.
- 1.25: commonly used for certain material factors in design, but not for site material here.
- 1.50: this is typically associated with load factors or other design situations, not the material factor for site.
The excavation exceeding 1.5m in width 10 sqm in plan area with a depth not exceeding 30 cm, is termed as -
A)
Excavation
B)
Surface dressing
C)
Cutting
D)
Surface excavation
In civil engineering estimation and costing (specifically according to standard specifications like CPWD), different types of earthwork are categorized based on the depth and area of excavation.
1. **Surface Dressing**: This refers to the first operation of removing the top layer of soil, vegetation, and organic matter to prepare the site. It is specifically defined as excavation where the depth does not exceed 15 cm (or in some contexts up to 30 cm) over a large area. When the excavation is shallow (not exceeding 30 cm) and covers a wide area (exceeding 1.5m in width), it is termed as surface dressing.
2. **Excavation**: This generally refers to deeper digging for foundations, trenches, or basements, usually measured in cubic meters (cum) and involving depths significantly greater than 30 cm.
3. **Cutting**: This term is typically used in roadwork or railway embankments where a hill or high ground is cut to achieve the required formation level.
4. **Surface Excavation**: This is not a standard technical term used in standard specifications to describe this specific shallow depth operation.
Since the question specifies a depth not exceeding 30 cm and a width exceeding 1.5m, it fits the technical definition of Surface Dressing.
For equal cross sectional area, the most efficient section for column is -
A)
I- Section
B)
Channel section
C)
Circular section
D)
Circular hollow section
The efficiency of a column section is determined by its ability to resist buckling. Buckling resistance depends on the Radius of Gyration (r), where r = sqrt(I/A). For a given cross-sectional area (A), the most efficient section is the one that maximizes the minimum moment of inertia (I_min) in all directions, thereby maximizing the radius of gyration and the critical buckling load (Euler's load).
1. **Circular Hollow Section (CHS):** This section distributes the material as far as possible from the centroidal axis in all directions. It has a constant radius of gyration in every direction, meaning there is no 'weak axis.' This makes it the most efficient shape for resisting compression and buckling for a given area.
2. **Circular Section (Solid):** While it has a constant radius of gyration, the material is concentrated toward the center, resulting in a lower moment of inertia compared to a hollow section of the same area.
3. **I-Section:** These are highly efficient for bending (beams) but have a very weak axis (the y-y axis), making them prone to buckling in that direction unless braced.
4. **Channel Section:** Like the I-section, it is asymmetrical and has a significantly weaker axis, making it less efficient than a circular hollow section for pure axial compression.
Depreciation amount charged on a machinery will be debited to -
A)
Repair account
B)
Cash account
C)
Depreciation account
D)
Machinery account
In accounting, depreciation is the systematic allocation of the cost of a tangible asset over its useful life. According to the double-entry bookkeeping system, every transaction affects at least two accounts. When depreciation is charged on machinery, the journal entry is:
1. Debit the 'Depreciation Account' (which is an expense account, and expenses are increased by debits).
2. Credit the 'Machinery Account' (or 'Accumulated Depreciation Account'), which reduces the book value of the asset.
Analysis of options:
- Option (a) Repair account: Repairs are revenue expenditures for maintenance, whereas depreciation is the allocation of the original capital cost.
- Option (b) Cash account: Depreciation is a non-cash expense; no cash leaves the business when depreciation is recorded.
- Option (c) Depreciation account: Correct. This account tracks the total expense of wear and tear for the period.
- Option (d) Machinery account: This account is credited (not debited) to reflect the decrease in the asset's value.
Consider the following statements regarding tendering for a civil work: 1. Earnest money deposit (EMD) is a prerequisite to tender for a work. 2. It is not essential to call for the contractor’s credentials when a tender is invited. Which of the above statements is/are correct?
A)
1 only
B)
2 only
C)
Both 1&2
D)
Neither 1 nor 2
Step-by-step analysis of the statements:
1. Statement 1: 'Earnest money deposit (EMD) is a prerequisite to tender for a work.'
This statement is CORRECT. EMD is a small percentage of the estimated cost (usually 1% to 5%) deposited by the contractor along with the tender. Its purpose is to ensure that the contractor is serious about the bid and will not withdraw the tender after it has been opened but before the work is awarded. If the contractor withdraws the bid or refuses to sign the agreement, the EMD is forfeited.
2. Statement 2: 'It is not essential to call for the contractor’s credentials when a tender is invited.'
This statement is INCORRECT. In civil engineering works, especially for government or large-scale projects, verifying the contractor's credentials (technical capacity, financial stability, past experience, and equipment availability) is essential. This process, often called 'Pre-qualification,' ensures that the work is awarded to a competent agency capable of completing the project on time and with the required quality. Awarding a contract without checking credentials would pose a significant risk of project failure.
Conclusion: Since only statement 1 is correct, the correct option is 'a'.
Choose the best word to complete the analogy: Ebullient is to Enthusiastic as __________ is to Indifferent.
A)
Phlegmatic
B)
Animated
C)
Zealous
D)
Ardent
Step 1: Analyze the relationship between the first pair of words. 'Ebullient' means overflowing with fervor, enthusiasm, or excitement. 'Enthusiastic' is a synonym for ebullient. Therefore, the relationship is one of synonymy (synonyms).
Step 2: Apply this relationship to the second pair. We need a word that is a synonym for 'Indifferent'. 'Indifferent' means having no particular interest or sympathy; unconcerned.
Step 3: Evaluate the options:
- (a) Phlegmatic: This describes a person who has an unemotional and stolidly calm disposition; it is a synonym for indifferent or apathetic.
- (b) Animated: This means full of life or excitement; it is an antonym of indifferent.
- (c) Zealous: This means showing great energy or enthusiasm in pursuit of a cause; it is an antonym of indifferent.
- (d) Ardent: This means enthusiastic or passionate; it is an antonym of indifferent.
Conclusion: Since 'Phlegmatic' is the only word that shares a similar meaning with 'Indifferent', it completes the analogy correctly.
The distance between two consecutive hair-pin bends should be a minimum of -
A)
60m
B)
50m
C)
40m
D)
65m
In Highway Engineering, specifically for hill road design, hair-pin bends are used to gain elevation in steep terrain. According to standard IRC (Indian Roads Congress) guidelines and general highway engineering practices for the design of hair-pin bends, the distance between two consecutive hair-pin bends should be kept sufficient to avoid driver fatigue and ensure safety. The minimum recommended distance between two consecutive hair-pin bends is 60 meters. This spacing is necessary to provide a transition zone and ensure that the vehicle has enough straight stretch to stabilize before entering another sharp turn. Options b, c, and d are incorrect as they do not meet the minimum safety and design standards specified for these road geometries.
Scrap value =
A)
Cost of asset - Useful life
B)
Cost of asset - (D x Useful life)
C)
Cost of asset + (D x Useful life)
D)
Depreciation
In valuation and accounting, Scrap Value (also known as Salvage Value) is the estimated value of an asset at the end of its useful life. Using the Straight-Line Method of depreciation, the total depreciation over the life of the asset is calculated as the annual depreciation amount (D) multiplied by the useful life of the asset. Therefore, the Scrap Value is the original cost of the asset minus the total accumulated depreciation.
Formula: Scrap Value = Original Cost - (Annual Depreciation × Useful Life).
Analysis of options:
- Option (a) is incorrect because you cannot subtract 'years' (life) from 'currency' (cost).
- Option (b) is correct as it represents the original cost minus total depreciation.
- Option (c) is incorrect because adding depreciation would increase the value of the asset over time, which contradicts the concept of wear and tear.
- Option (d) is incorrect because scrap value is the remaining value, not the depreciation amount itself.
If B is the width of formation, d is the height of the embankment, side slope S : 1, for a highway with no transverse slope, the area of cross section is -
A)
B+d+S8d
B)
Bd +Sd²
C)
B+d
D)
5 (Bd + Sd*)
To find the area of the cross-section of a highway embankment with no transverse slope (flat top), we treat the cross-section as a trapezoid.
1. **Given Parameters:**
- Width of formation (top width) = B
- Height of embankment = d
- Side slope = S : 1 (Horizontal : Vertical). This means for every 1 unit of height, the horizontal distance increases by S units.
2. **Calculating the Bottom Width:**
Since there are two side slopes, the total width at the base is the top width plus the horizontal projection of the slopes on both sides.
Bottom Width = B + 2 * (S * d)
3. **Calculating the Area of a Trapezoid:**
The area (A) of a trapezoid is given by the formula:
A = [(Top Width + Bottom Width) / 2] * Height
A = [(B + (B + 2Sd)) / 2] * d
A = [(2B + 2Sd) / 2] * d
A = (B + Sd) * d
A = Bd + Sd²
Comparing this result to the options provided:
- Option (a) is mathematically incorrect.
- Option (b) matches our derivation: Bd + Sd².
- Option (c) is incorrect as it ignores the geometry of the embankment.
- Option (d) is incorrect and contains typographical errors (Sd*).
Minimum number of battens required in built up column are -
A)
4
B)
3
C)
5
D)
2
In the design of built-up columns (columns consisting of two or more main components connected by battens or lacing), the purpose of the battens is to maintain the distance between the main components and prevent them from buckling individually. According to standard structural steel design codes (such as IS 800), for a built-up column to be stable and to ensure that the components act as a single unit, there must be a minimum of two battens. One batten is typically provided at each end of the column (or near the ends) to ensure the components are held together and to provide the necessary restraint against lateral movement. While more battens are often used to reduce the slenderness ratio of the individual components, the absolute minimum requirement to constitute a 'built-up' assembly is two.
Thickness of plastering is usually -
A)
12mm
B)
20mm
C)
10mm
D)
6mm
Plastering is the process of applying a thin layer of mortar over a masonry surface to provide a smooth, durable, and protective finish. The thickness of plastering depends on the surface being plastered and the type of finish required.
1. For general internal walls (brickwork), the standard thickness of a single coat of cement plaster is typically 12mm.
2. If the surface is very uneven, it may be applied in two coats (e.g., 12mm + 12mm), but the standard single-coat thickness cited in most building codes and textbooks for general purposes is 12mm.
3. 6mm is typically used for ceiling plastering (where weight is a concern) or very thin skim coats.
4. 20mm is generally considered too thick for a single coat, as it increases the risk of shrinkage cracks and peeling (delamination).
Therefore, among the given options, 12mm is the most standard and widely accepted thickness for general plastering work.
In the __________ mean depth is to be calculated first by averaging the depths of two consecutive sections.
A)
Trapezoidal formula
B)
Mid - Section formula
C)
Prismoidal formula
D)
Simpson’s rule
In the context of earthwork calculations for estimating and costing in Civil Engineering, there are three primary methods used to calculate volume: the Mid-Section formula, the Trapezoidal formula, and the Prismoidal formula.
1. **Mid-Section Formula**: In this method, the volume is calculated by taking the area of a section midway between two consecutive sections. The depth (or area) at this mid-section is calculated as the average of the depths (or areas) of the two consecutive end sections. Specifically, the mean depth is calculated first to find the mid-sectional area, which is then multiplied by the distance between the sections.
2. **Trapezoidal Formula (Average End Area Method)**: This method calculates the volume by taking the average of the areas of two consecutive end sections and multiplying it by the distance between them. It does not calculate a 'mean depth' for a mid-section; it averages the final areas.
3. **Prismoidal Formula**: This is the most accurate method. It uses the areas of the two end sections and the area of the mid-section (calculated based on the average of the linear dimensions, not just a simple average of depths). The formula is V = (L/6) * [A1 + A2 + 4Am].
4. **Simpson's Rule**: This is essentially the mathematical basis for the Prismoidal formula and is used for calculating areas or volumes under curves, but the specific terminology of 'calculating mean depth first' refers to the Mid-Section approach in earthwork estimation.
Choose the correct word that best completes the sentence: The professor’s explanation was so __________ that even the most attentive students struggled to grasp the concept.
A)
Perspicuous
B)
Obfuscating
C)
Lucid
D)
Articulate
The sentence contains a contrast indicator: 'even the most attentive students struggled to grasp the concept.' This implies that the professor's explanation was unclear, confusing, or difficult to understand.
1. **Obfuscating (Correct):** To obfuscate means to render obscure, unclear, or unintelligible. If an explanation is obfuscating, it makes the subject harder to understand, which aligns perfectly with the students' struggle.
2. **Perspicuous (Incorrect):** This means clearly expressed and easily understood. If the explanation were perspicuous, the students would not have struggled.
3. **Lucid (Incorrect):** This means expressed clearly; easy to understand. Like 'perspicuous,' this contradicts the context of the sentence.
4. **Articulate (Incorrect):** This means having or showing the ability to speak fluently and coherently. An articulate professor would typically be easy to understand, making this option incorrect in this context.
Select the word that correctly fills the blank: Despite his __________ personality, he managed to lead the team successfully through the crisis.
A)
Garrulous
B)
Taciturn
C)
Effervescent
D)
Gregarious
The key to solving this sentence is the word 'Despite', which indicates a contrast (concession) between the person's personality and their action. Leading a team successfully through a crisis typically requires strong communication, assertiveness, and active guidance. Therefore, the blank must be filled with a word that describes a personality trait that would normally be a hindrance to leadership or communication.
1. **Taciturn (Correct):** This means reserved, uncommunicative, or saying very little. A taciturn person is the opposite of a typical 'charismatic' or 'vocal' leader. Thus, it is impressive (hence 'Despite') that someone so quiet could lead a team successfully.
2. **Garrulous (Incorrect):** This means excessively talkative. While being too talkative can be a flaw, it is not as strong a contrast to 'leading a team' as being silent is, as leadership often involves talking.
3. **Effervescent (Incorrect):** This means vivacious, enthusiastic, or bubbly. This is a positive trait that generally aids in motivating a team, so it would not create the contrast required by 'Despite'.
4. **Gregarious (Incorrect):** This means fond of company; sociable. Like effervescent, being sociable is generally an advantage for a leader, making 'Despite' logically incorrect in this context.
Identify the word that is most opposite in meaning to “Mendacious”: His mendacious nature made it difficult to trust anything he said.
A)
Untruthful
B)
Honest
C)
Sincere
D)
Deceitful
Step 1: Analyze the target word. 'Mendacious' is an adjective derived from the Latin 'mendax' (lying). It means not telling the truth; lying or habitually dishonest. In the context of the sentence ('His mendacious nature made it difficult to trust anything he said'), it clearly refers to a lack of truthfulness.
Step 2: Identify the requirement. The question asks for the word 'most opposite in meaning' (the antonym).
Step 3: Evaluate the options:
- (a) Untruthful: This is a synonym of mendacious, not an antonym.
- (b) Honest: This means free of deceit and untruthfulness; truthful. This is the direct opposite of mendacious.
- (c) Sincere: While sincerity involves honesty, it specifically refers to the absence of pretense or hypocrisy. 'Honest' is a more precise and direct antonym for the act of lying (mendacity).
- (d) Deceitful: This is a synonym of mendacious.
Step 4: Conclusion. Since 'mendacious' means lying, the most accurate opposite is 'honest'.