Practice by Category & Subject

Strength is the fundamental property that defines a material's capacity to resist deformation or failure when subjected to an external force or load. This ability allows structures and components to support weight without breaking or permanently changing shape under normal operating conditions. When a load is applied, the internal atomic bonds within the material generate resistance forces to counteract the stress. If the applied load exceeds this inherent strength, the material will eventually yield or fracture. Therefore, this specific characteristic is the primary metric used to determine how much load a material can safely withstand.

Question 2 Easy Mcq

✓ Correct ✗ Incorrect

When a column is subjected to an eccentric load, the stress induced in the column will be

Direct and bending stress both

Direct stress only

Shear stress only

Bending stress only

Explanation:

When a column carries an eccentric load, the force acts at a distance from the centroidal axis, creating a moment in addition to the axial force. This axial force generates uniform direct compressive stress across the cross-section, while the resulting moment induces a linearly varying bending stress. Consequently, the total stress at any point is the superposition of these direct and bending components, making both types of stress present simultaneously in the column.

Question 3 Easy Mcq

✓ Correct ✗ Incorrect

The shear force on a simply supported beam is proportional to

Displacement of the neutral axis

Sum of the forces

Sum of the transverse forces

Algebraic sum of the transverse forces of the section

Explanation:

In beam mechanics, the internal shear force at any specific cross-section is fundamentally defined as the algebraic sum of all transverse external forces acting on either side of that section. This equilibrium condition ensures that the internal shear resists the net vertical load, making it directly proportional to this summation rather than displacement or total force magnitude. Consequently, calculating shear requires isolating a segment and summing only the vertical components, which aligns precisely with the definition provided in option D.

Question 4 Easy Mcq

✓ Correct ✗ Incorrect

In the tensile test, the phenomenon of slow extension of the material, i. stress increasing with the time at a constant load is called

Creeping

Yielding

Breaking

Plasticity

Explanation:

This phenomenon is known as creep, which occurs when a material undergoes slow, continuous deformation under a constant load over an extended period. Unlike elastic deformation, this extension happens gradually even if the applied stress remains unchanged, typically at elevated temperatures or over long durations. The stress increases with time because the material's internal structure, such as dislocation movement or grain sliding, progressively accommodates the load, leading to permanent elongation. This distinguishes it from yielding, which involves a sudden drop in stress, or plasticity, which is a general property rather than a time-dependent process. Therefore, the specific behavior of time-dependent extension under constant load is accurately defined as creeping.

Question 5 Easy Mcq

✓ Correct ✗ Incorrect

What is the Rupture Stress?

The point where the steel becomes elastic

The point where the steel becomes brittle

The point where the steel becomes plastic

The point where the steel actually breaks

Explanation:

Rupture stress represents the maximum stress a material can withstand before it physically fails and separates into pieces. This specific point marks the ultimate limit of the material's strength, occurring immediately after the necking phase where the cross-sectional area has significantly reduced. At this stage, the internal structural integrity is completely lost, causing the steel bar to snap under the applied load. Therefore, it is definitively identified as the exact moment the steel actually breaks.

Question 6 Easy Mcq

✓ Correct ✗ Incorrect

What does the term "strength" mean in materials science?

Height of a material's Young's modulus

Volume of a material

Amount of stress within a material

Ability to withstand an applied load without failure

Explanation:

In materials science, strength is defined as the maximum stress a material can endure before it fails or breaks under an applied load. This property is crucial for engineering design because it determines the safety limits of structures and components. Unlike stiffness, which relates to deformation, strength specifically measures the threshold where permanent damage or fracture occurs. Therefore, it directly represents the ability to withstand external forces without losing structural integrity. This fundamental concept ensures that materials perform reliably under expected operational conditions.

Question 7 Easy Mcq

✓ Correct ✗ Incorrect

A simply supported beam of span carries a uniformly distributed load . The maximum bending moment is

WL/2

WL/4

WL/8

WL/12

Explanation:

For a simply supported beam carrying a uniformly distributed load, the maximum bending moment occurs at the mid-span where the shear force is zero. By deriving the moment equation from the reaction forces, the peak value is calculated as the product of the total load and the span length, divided by eight. This specific distribution creates a parabolic moment diagram that reaches its highest point exactly at the center of the beam. Therefore, the correct expression for this maximum moment is WL/8, reflecting the fundamental behavior of beams under uniform loading conditions.

Question 8 Easy Mcq

✓ Correct ✗ Incorrect

The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called

Longitudinal stress

Hoop stress

Yeiled stress

Ultimate stress

Explanation:

When a cylindrical vessel is subjected to internal fluid pressure, the force acts along the circumference to push the walls outward. This specific force creates tensile stress within the wall material that acts perpendicular to the longitudinal axis of the cylinder. Because this stress circulates around the hoop of the cylinder, it is technically defined as hoop stress, distinguishing it from stresses acting along the length of the vessel.

Question 9 Easy Mcq

✓ Correct ✗ Incorrect

If the stress in each cross-section of a pillar is equal to its working stress, it is called

Body of equal

Body of equal section

Body of equal strength

None of these

Explanation:

A pillar is termed a body of equal strength when the stress at every cross-section exactly matches its working stress, ensuring uniform load-carrying capacity throughout. This design principle optimizes material usage by preventing over-engineering in lower-stress regions while maintaining safety at critical points. Consequently, the structure achieves maximum efficiency because no section is significantly stronger or weaker than required for the applied load. This specific condition defines the unique geometric profile often found in tapered columns. Therefore, the term correctly describes a structure where strength is perfectly balanced against the applied stress distribution.

Question 10 Easy Mcq

✓ Correct ✗ Incorrect

A riveted joint in which the number otrivets decrease from innermost to outer most row is called

Chain riveted joint

Diamond riveted joint

Criss-cross riveted joint

Zig-zag riveted joint

Explanation:

A diamond riveted joint is specifically defined by its unique pattern where the number of rivets decreases progressively from the innermost row to the outermost row. This configuration creates a shape resembling a diamond or rhombus when viewed in cross-section, distinguishing it from chain or zig-zag patterns that maintain a constant number of rivets. The design is often used to optimize load distribution in specific structural applications where a tapered arrangement of fasteners is required. This geometric progression is the sole characteristic that validates the classification as a diamond joint. Understanding this specific reduction in rivet count is key to identifying the joint type correctly.

Question 11 Easy Mcq

✓ Correct ✗ Incorrect

A cylindrical section having no joint is known as

Jointless section

Homogeneous section

Perfect section

Seamless section.

Explanation:

A cylindrical section constructed without any longitudinal joints is technically defined as a seamless section, as the term "seamless" literally implies the absence of seams or joints along its length. This design is typically achieved through specialized manufacturing processes like the spinning or extrusion of a single continuous piece of material, ensuring structural integrity and uniformity. Unlike sections with welded or riveted joints, a seamless cylinder eliminates potential weak points where leaks or failures might initiate under pressure. Consequently, the designation "seamless" accurately reflects the continuous, unbroken nature of the cylinder's wall. This terminology is standard in engineering and manufacturing to distinguish such components from those requiring assembly via joints.

Question 12 Easy Mcq

✓ Correct ✗ Incorrect

A projectile is fired at an angle to the vertical. Its horizontal range will be maximum when is

0°

30°

45°

60°

Explanation:

The horizontal range of a projectile is maximized when the launch angle relative to the horizontal ground is 45 degrees, not relative to the vertical. At this specific angle, the initial velocity is optimally balanced between the vertical component, which provides flight time, and the horizontal component, which covers distance. Any deviation from 45 degrees results in a shorter range because the balance between height and speed is no longer ideal. Therefore, the correct angle to achieve maximum range is 45 degrees.

Question 13 Easy Mcq

✓ Correct ✗ Incorrect

The neutral axis of a beam cross-section must

Pass through the centroid of the section

Be equidistant from the top of bottom films

Be an axis of symmetry of the section

None of these

Explanation:

The neutral axis is defined as the line within a beam's cross-section where longitudinal stress is zero during bending. For linear elastic materials under pure bending, the internal moment is balanced by the first moment of area about this axis, which mathematically requires it to pass through the centroid. This geometric property ensures that the compressive forces on one side perfectly counteract the tensile forces on the other, maintaining equilibrium without any net axial force. Consequently, the location of the neutral axis is intrinsically tied to the centroid of the section's area, regardless of the specific shape or symmetry of the beam.

Question 14 Easy Mcq

✓ Correct ✗ Incorrect

A three-hinged arch is said to be:

Statically determinate structure

Statically indeterminate structure

A bent beam

None of these

Explanation:

A three-hinged arch is classified as a statically determinate structure because the presence of the three hinges provides sufficient geometric constraints to solve for all internal forces and reactions using only the three equations of static equilibrium. Unlike indeterminate structures that require compatibility conditions, the internal hinge locations allow the bending moments at those points to be zero, simplifying the analysis significantly. This unique configuration ensures that the structure's stability and force distribution can be fully determined without needing additional material properties or deformation calculations. Consequently, it is a fundamental example of determinacy in structural mechanics where the number of unknowns exactly matches the available equilibrium equations.

Question 15 Easy Mcq

✓ Correct ✗ Incorrect

Percentage reduction of area in performing tensile test on cast iron may be of the order of

50%

25%

15%

Explanation:

In a tensile test, the percentage reduction of area measures the material's ductility by quantifying necking before fracture. Cast iron is inherently brittle due to its graphite flakes, which act as stress concentrators and prevent significant plastic deformation. Consequently, the specimen fractures with almost no visible necking, resulting in a reduction of area that is effectively zero. This distinguishes it from ductile materials like mild steel, which exhibit substantial area reduction before breaking.

Question 16 Easy Mcq

✓ Correct ✗ Incorrect

Along the principal plan subjected to maximum principal stress

Maximum shear stress acts

Minimum shear stress acts

No shear stress acts

None of these

Explanation:

On the principal planes of a stress element, the shear stress component is inherently zero by definition. These specific orientations are determined precisely because the normal stresses acting on them reach their maximum and minimum values, while the shear stress vanishes completely. Consequently, the planes experiencing maximum or minimum normal stress are the only planes where no shear stress acts, making this a fundamental characteristic of principal stress states.

Question 17 Easy Mcq

✓ Correct ✗ Incorrect

What is the intensity of the internal resisting force called?

Pressure

Strain

Force

Stress

Explanation:

Stress is defined as the internal resisting force per unit area that develops within a material when subjected to an external load. This concept quantifies how the material internally distributes the force to maintain equilibrium against deformation. Unlike total force, which is an external action, stress represents the intensity of that force spread over the cross-sectional area. Therefore, it is the precise term used to describe the magnitude of internal resistance at a specific point. Understanding this distinction is fundamental to analyzing structural integrity and material failure.

Question 18 Easy Mcq

✓ Correct ✗ Incorrect

What kind of test determines yield strength?

Alliance

Bending

Shear

Tensile

Explanation:

Yield strength is the specific stress point where a material transitions from elastic deformation to permanent plastic deformation. This critical property is directly measured by pulling a specimen apart until it stretches and thins, which is the fundamental principle of a tensile test. During this process, the resulting stress-strain curve clearly identifies the yield point, making the tensile test the definitive method for determining this value. Other testing methods focus on different failure modes or properties, whereas tensile testing specifically isolates the material's resistance to being pulled apart. Therefore, this test is the standard industry practice for establishing yield strength specifications.

Question 19 Easy Mcq

✓ Correct ✗ Incorrect

Pick up the correct assumption of the theory of simple bending

The value of the Young's modulus is the same in tension as well as in compression

Transverse section of a beam remains plane before and after bending

The material of the beam is homogeneous and isotropic

All the above

Explanation:

The theory of simple bending relies on three fundamental assumptions to simplify complex stress analysis. First, the material is assumed to be homogeneous and isotropic, ensuring uniform properties throughout. Second, the cross-section remains plane after bending, which links strain directly to the distance from the neutral axis. Third, Young's modulus is identical in tension and compression, allowing for a linear stress distribution. Together, these principles form the complete theoretical basis for calculating bending moments and stresses in beams.

Question 20 Easy Mcq

✓ Correct ✗ Incorrect

The unit of power in S.I. units is

Newton meter

Watt

Joule

Kilogram meter/sec

Explanation:

Power is defined as the rate at which work is done or energy is transferred over time, mathematically expressed as energy divided by time. In the International System of Units, energy is measured in Joules and time in seconds, resulting in the derived unit Joules per second. This specific rate of energy transfer is universally recognized and named the Watt, named after James Watt to honor his contributions to steam engine efficiency. Consequently, the Watt serves as the standard SI unit for quantifying power in all scientific and engineering contexts.

Question 21 Easy Mcq

✓ Correct ✗ Incorrect

A simply supported beam carries two equal concentrated loads W at distances L/3 from either support. The maximum bending moment

WL/3

WL/4

5WL/4

3WL/12

Explanation:

For a simply supported beam with two equal loads W placed at L/3 from each support, the maximum bending moment occurs directly under either load. By calculating the reaction forces and taking moments about the load point, the moment is found to be the product of the load W and the distance L/3 from the support. This specific configuration results in a peak moment value of WL/3, making it the correct choice for this structural scenario.

Question 22 Easy Mcq

✓ Correct ✗ Incorrect

If a constant section beam is subjected to a uniform bending moment throughout, its length bends to

A circular arc

A parabolic arc

A catenary

None of these

Explanation:

When a beam with a constant cross-section experiences a uniform bending moment along its entire length, the curvature remains constant at every point. Since the radius of curvature is uniform throughout the span, the resulting deformed shape is a perfect circular arc. This fundamental relationship between constant moment and constant curvature distinguishes it from cases involving linearly varying loads, which produce parabolic deflections.

Question 23 Easy Mcq

✓ Correct ✗ Incorrect

In a bar of large length when held vertically and subjected to a load at its lower end, its ownweight produces additional stress. The maximum stress will be

At the lower cross-section

At the built-in upper cross-section

At the central cross-section

At every point of the bar

Explanation:

When a vertical bar supports its own weight along with an external load, the internal axial force accumulates from the bottom upward. The lower sections carry only the external load, while the upper sections must support the external load plus the entire weight of the bar below them. Consequently, the total internal force reaches its peak at the fixed upper cross-section, resulting in the maximum stress occurring at that built-in location.

Question 24 Easy Mcq

✓ Correct ✗ Incorrect

A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be

30 MN/m2

50 MN/m2

100 MN/m2

200 MN/m2

Explanation:

Hoop stress in a thin cylindrical shell is calculated using the formula σ = (P × D) / (2 × t), where P is internal pressure, D is diameter, and t is plate thickness. Substituting the given values (P = 1.5 MN/m², D = 200 cm = 2 m, t = 1.5 cm = 0.015 m) into the equation yields a stress of 100 MN/m². This demonstrates that the circumferential stress arises directly from the internal pressure acting on the curved surface area relative to the shell's thickness. The calculation confirms that option C is the correct result based on standard mechanics of materials principles.

Question 25 Easy Mcq

✓ Correct ✗ Incorrect

In ideal machines

Mechanical advantage is greater than velocity ratio

Mechanical advantage is equal to velocity ratio

Mechanical advantage is less than velocity ratio

Mechanical advantage is unity

Explanation:

In an ideal machine, friction and other energy losses are assumed to be zero, meaning no work is wasted during operation. Consequently, the work input exactly equals the work output, which directly implies that the mechanical advantage must equal the velocity ratio. This perfect efficiency ensures that the force multiplication capability matches the distance trade-off precisely, making the two ratios identical.

Question 26 Easy Mcq

✓ Correct ✗ Incorrect

Which of the following is not a characteristic of a force in compression?

The member will lengthen its length.

The member will experience no change in length.

The member will buckle.

The member will shorten its length.

Explanation:

When a structural member is subjected to a compressive force, the external loads push inward on both ends, causing the material to shorten in length rather than elongate. This shortening occurs because the internal particles are forced closer together, directly opposing the definition of lengthening found in the incorrect option. While significant compression can lead to buckling or, in extreme cases, no change if the material yields, the fundamental immediate effect of a standard compressive load is a reduction in the member's overall dimensions. Therefore, any statement suggesting the member will lengthen contradicts the basic mechanical behavior of compression.

Question 27 Easy Mcq

✓ Correct ✗ Incorrect

Euler's formula states that the buckling load for a column of length , both ends hinged and whose least moment of inertia and modulus of elasticity of the material of the column are and respectively, is given by the relation

P = ²EI/l²

P = /EI

P = /l²

P = ²EI/l3

Explanation:

Euler's formula for a column with both ends hinged derives the critical buckling load by balancing the elastic restoring moment against the destabilizing moment caused by the axial load. The derivation shows that the load is directly proportional to the material's stiffness (modulus of elasticity E) and the column's geometric resistance to bending (least moment of inertia I), while being inversely proportional to the square of the column's length. This relationship results in the expression P = π²EI/l², where the constant π² is often omitted in simplified notations, confirming that the load depends on the product of E and I divided by the length squared.

Question 28 Easy Mcq

✓ Correct ✗ Incorrect

Which of the following is not the unit of energy

Kg m

Kcal

Wattr

Watt hours

Explanation:

Energy is defined as the capacity to do work, and its standard SI unit is the Joule, which equals a Newton-meter or kilogram-meter squared per second squared. The option "Wattr" is not a recognized unit of energy because it appears to be a misspelling or confusion with the Watt, which measures power (energy per unit time) rather than energy itself. In contrast, units like Kilocalories and Watt-hours are valid measures of energy, representing heat content and electrical energy consumption over time, respectively. Therefore, the incorrect term stands out as the one that does not represent a valid unit for energy in physics or engineering contexts.

Question 29 Easy Mcq

✓ Correct ✗ Incorrect

What is the SI unit for Stress?

N/m^2

MPa

Kg/m^2

Explanation:

Stress is defined as force applied per unit area, which mathematically results in the derived SI unit of newtons per square meter (N/m²). This specific combination of base units is officially named the Pascal (Pa) in the International System of Units. Since the Pascal represents exactly one newton per square meter, it serves as the standard and most direct representation for stress in scientific contexts. Therefore, the Pascal is the correct choice as it directly embodies the fundamental definition of stress within the SI framework.

Question 30 Easy Mcq

✓ Correct ✗ Incorrect

The bending moment at C of a portal frame shown in below figure is

8 t-m

4 t-m

28 t-m

Zero

Explanation:

In a standard portal frame with pinned supports and a horizontal hinge at the apex, the bending moment at the hinge location is inherently zero because a hinge cannot resist any moment. This structural feature ensures that the internal moment at point C vanishes regardless of the external loads applied to the frame. Consequently, the bending moment diagram shows a discontinuity or a point of zero value exactly at the hinge, making the correct value zero. This fundamental principle of structural analysis simplifies calculations by dividing the frame into simpler segments. Understanding that hinges create points of zero moment is essential for solving indeterminate or determinate frame problems efficiently.

Question 31 Easy Mcq

✓ Correct ✗ Incorrect

When loads are applied proportionately to a frame structure containing its members in one plane, the structure is called

Grid frame

Plane frame

Space frame

Truss frame

Explanation:

A structure where all loads are applied proportionately within a single plane is defined as a space frame because it is designed to resist forces acting in three dimensions while maintaining structural integrity across that specific plane. This configuration allows the members to work together efficiently, distributing stresses evenly throughout the interconnected framework to handle complex loading conditions. The term space frame accurately reflects the comprehensive nature of the structure, ensuring stability and strength under various applied loads without relying on external supports beyond the plane itself.

Question 32 Easy Mcq

✓ Correct ✗ Incorrect

What is hardness?

The ability of a material to bend under pressure

The ability of a material to resist abrasion

The ability of a material to resist permanent change of shape caused by an external force.

The ability of a material to shatter when hit

Explanation:

Hardness is fundamentally defined as a material's capacity to withstand permanent deformation when subjected to an external force. This property ensures that the material maintains its original shape and structural integrity rather than bending or flowing under stress. In practical terms, this resistance prevents surfaces from being easily scratched, dented, or permanently altered during use. Therefore, the ability to resist a permanent change of shape is the precise scientific definition of hardness. This concept distinguishes hard materials from soft ones that yield easily to pressure. Understanding this definition is essential for selecting appropriate materials in engineering and manufacturing applications.

Question 33 Easy Mcq

✓ Correct ✗ Incorrect

The limit of eccentricity is based upon no tension condition.

True

False

Explanation:

The limit of eccentricity is defined by the condition where the resultant force acts at the edge of the kern, ensuring that no tensile stress develops within the cross-section. This principle is critical for materials like masonry and concrete, which possess negligible tensile strength and must remain in compression to prevent cracking. By restricting the load's eccentricity, engineers guarantee that the entire section stays under compressive stress, thereby maintaining structural integrity and serviceability. Consequently, the statement accurately reflects the fundamental design criterion used to avoid tension in these specific structural elements.

Question 34 Easy Mcq

✓ Correct ✗ Incorrect

For a simply supported beam with a central load, the bending moment is

Least at the centre

Least at the supports

Maximum at the supports

Maximum at the centre

Explanation:

In a simply supported beam subjected to a central point load, the bending moment reaches its peak value exactly at the center of the span. This occurs because the internal moment accumulates from the supports toward the load, creating the highest stress point directly under the applied force. Conversely, the moment drops to zero at the supports where the beam is pinned or roller-supported. Therefore, the maximum bending moment is definitively located at the center, making this the critical section for structural design.

Question 35 Easy Mcq

✓ Correct ✗ Incorrect

What is typically maximum surface stress?

Design stress

Shear stress

Ultimate stress

Explanation:

Maximum surface stress in a structural component is fundamentally limited by the design stress to ensure safety and prevent failure under normal operating conditions. Design stress represents the highest allowable stress level calculated by engineers, incorporating necessary safety factors against material yield or ultimate strength. By capping the surface stress at this specific value, the structure maintains its integrity and avoids catastrophic deformation or fracture during service. This limit is established through rigorous analysis of material properties and expected loading scenarios to guarantee reliable performance. Consequently, the design stress serves as the definitive upper bound for acceptable surface stress in practical engineering applications.

Question 36 Easy Mcq

✓ Correct ✗ Incorrect

The G. of a right circular solid cone of height h lies at the following distance from the base

H/2

J/3

H/6

H/4

Explanation:

The center of gravity of a uniform right circular cone is located along its axis of symmetry, specifically at a distance of one-fourth the height from the base. This position arises because the mass is distributed more heavily near the base than at the apex, pulling the balance point closer to the wider end compared to a uniform rod. Consequently, the centroid lies at h/4 from the base and 3h/4 from the vertex, making this the standard geometric property for such solids.

Question 37 Easy Mcq

✓ Correct ✗ Incorrect

Effect of a force on a body depends upon

Magnitude

Direction

Position or line of action

All of the above

Explanation:

The effect of a force on a body is fundamentally determined by three essential characteristics that cannot be ignored. First, the magnitude defines how strong the push or pull is, directly influencing the acceleration produced. Second, the direction specifies the line along which the force acts, determining whether the object moves forward, backward, or rotates. Third, the position or line of action dictates exactly where the force is applied, which is crucial for causing rotation or bending. Consequently, all these factors—magnitude, direction, and position—must be considered together to fully understand a force's impact.

Question 38 Easy Mcq

✓ Correct ✗ Incorrect

D' Alembert's principle is used for

Reducing the problem of kinetics to equivalent statics problem

Determining stresses in the truss

Stability of floating bodies

Designing safe structures

Explanation:

D'Alembert's principle introduces inertial forces, such as mass times acceleration, into the equations of motion to treat dynamic systems as if they were in static equilibrium. By effectively moving the acceleration term to the left side of the equation, it transforms a complex kinetic problem into an equivalent statics problem, allowing engineers to apply standard static analysis methods to moving bodies. This powerful technique simplifies the mathematical formulation of dynamics by balancing applied forces with these fictitious inertial forces. Consequently, it provides a robust framework for analyzing mechanical systems under acceleration without needing to solve differential equations directly. This approach is fundamental in mechanics for solving problems involving constrained motion and dynamic equilibrium.

Question 39 Easy Mcq

✓ Correct ✗ Incorrect

The distance between the centres of adjacent rivets in the same row, is called

Pitch

Lap

Gauge

Staggered pitch

Explanation:

In riveted joint design, the term pitch specifically refers to the longitudinal distance measured between the centers of two adjacent rivets located in the same row. This spacing is a critical parameter because it directly influences the strength of the joint against tearing failure along the line of rivets. Engineers must carefully calculate the minimum required pitch to ensure the material between rivets is thick enough to withstand the applied loads. Consequently, this specific measurement is universally defined as the pitch in structural mechanics and fabrication standards.

Question 40 Easy Mcq

✓ Correct ✗ Incorrect

The safe twisting moment for a compound shaft is equal to the

Maximum calculated value

Minimum calculated value

Mean value

Extreme value

Explanation:

In a compound shaft composed of different materials or sections, each segment possesses a distinct capacity to resist twisting moments. To ensure the entire assembly remains safe under load, the design must prevent failure in the weakest link, as exceeding the capacity of any single section will cause the whole shaft to fail. Therefore, the safe twisting moment is strictly limited by the lowest calculated value among all segments, guaranteeing that no part of the shaft exceeds its elastic limit or yield strength. This conservative approach ensures structural integrity and prevents catastrophic failure across the entire system.

Question 41 Easy Mcq

✓ Correct ✗ Incorrect

On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

Towards the wall at its upper end

Away from the wall at its upper end

Upwards at its upper end

Downwards at its upper end

Explanation:

Since the ground is smooth, there is no friction at the base, meaning the wall must provide the sole horizontal frictional force to prevent the ladder from slipping. At the upper end where the ladder contacts the wall, the tendency of motion is for the top to slide down along the wall. Friction always opposes this relative motion, so it acts upwards on the ladder at its upper end to counteract the downward slip.

Question 42 Easy Mcq

✓ Correct ✗ Incorrect

At either end of a plane frame, maximum number of possible transverse shear forces, are

One

Two

Three

Four

Explanation:

In a standard plane frame analysis, each joint or end of a member typically connects to only one adjacent member, resulting in a single transverse shear force acting at that specific location. The equilibrium of forces at a rigid joint ensures that the shear transmitted through the connection is unique for that particular end, preventing multiple independent shear values from existing simultaneously at the same point. Therefore, the maximum number of possible transverse shear forces at either end of a plane frame member is strictly limited to one. This fundamental principle simplifies structural calculations by defining a single shear value per connection point. Understanding this constraint is essential for accurately drawing shear force diagrams and ensuring structural stability.

Question 43 Easy Mcq

✓ Correct ✗ Incorrect

The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight

Of same magnitude as that of bar and applied at the lower end

Half the weight of bar applied at lower end

Half of the square of weight of bar applied at lower end

One-fourth of weight of bar applied at lower end

Explanation:

When a uniform bar hangs vertically, the internal axial force varies linearly from zero at the free end to the full weight of the bar at the fixed support. Because this stress distribution is triangular rather than uniform, the total elongation is exactly half of what would occur if the entire weight of the bar were concentrated at the bottom. Consequently, the deformation caused by the bar's self-weight is mechanically equivalent to applying a load equal to half the bar's weight at its lower end.

Question 44 Easy Mcq

✓ Correct ✗ Incorrect

The weight of a body is due to

Centripetal force of earth

Gravitational pull exerted by the earth

Forces experienced by body in atmosphere

Gravitational force of attraction towards the centre of the earth

Explanation:

The weight of a body is fundamentally defined as the force resulting from the gravitational attraction between the object and the Earth. This force acts specifically towards the center of the Earth, pulling the body downwards. While centripetal forces exist due to Earth's rotation, they are negligible compared to gravity in this context. Therefore, weight is directly caused by the gravitational pull directed toward the planet's center, making this the precise physical definition.

Question 45 Easy Mcq

✓ Correct ✗ Incorrect

The maximum deflection of a simply supported beam of length L with a central load W, is

WL²/48EI

W²L/24EI

WL3

/48EI

Explanation:

The maximum deflection for a simply supported beam with a central point load occurs at the midpoint where bending moment is highest. Using the standard beam deflection formula derived from integration of the elastic curve, the displacement is directly proportional to the load W and the cube of the length L, while inversely proportional to the flexural rigidity EI. The specific coefficient for this loading condition is 1/48, resulting in the expression WL³/48EI. This cubic relationship with length highlights that beam deflection increases dramatically as the span grows. Therefore, the correct mathematical representation of this physical behavior matches the provided option.

Question 46 Easy Mcq

✓ Correct ✗ Incorrect

If a steel rod of 20 mm diameter and 5 metres long elongates by 2.275 mm when subjected to an axial pull of 3000 kg, the stress developed, is

9.5541 kg/cm2

95.541 kg/cm2

955.41 kg/cm2

9554.1 kg/cm2

Explanation:

Stress is fundamentally defined as the internal force per unit area, calculated by dividing the applied axial load by the cross-sectional area of the rod. In this scenario, the elongation data provided is extraneous information intended to distract, as stress depends solely on the load and the original geometry, not the resulting deformation. By converting the diameter to centimeters to find the area and dividing the 3000 kg load by this area, the calculation directly yields the stress value of 955.41 kg/cm². This confirms that the correct answer relies on the basic definition of normal stress rather than complex strain relationships.

Question 47 Easy Mcq

✓ Correct ✗ Incorrect

The maximum strain energy that can be stored in a body is known as

Impact energy

Resilience

Proof resilience

Modulus of resilience

Explanation:

Proof resilience is specifically defined as the maximum strain energy that a material can store elastically before yielding occurs. This concept represents the limit of a body's ability to absorb energy without undergoing permanent deformation, distinguishing it from total impact energy or the energy per unit volume known as the modulus of resilience. When a load is removed, this stored energy allows the body to return completely to its original shape, making it the precise term for maximum recoverable strain energy. Therefore, this definition directly aligns with the standard engineering terminology for the maximum elastic energy storage capacity of a structure.

Question 48 Easy Mcq

✓ Correct ✗ Incorrect

What is the deformation of the material called?

Stress

Load

Strain

Strain rate

Explanation:

Deformation refers to the physical change in shape or size of a material when subjected to an external force. This specific measure of relative displacement is technically defined as strain, which quantifies how much the material has stretched or compressed compared to its original dimensions. While stress represents the internal force per unit area and load is the external force applied, strain is the direct term for the resulting geometric distortion. Therefore, identifying this change in configuration correctly points to strain as the precise scientific term. Understanding this distinction is fundamental to analyzing material behavior under various loading conditions.

Question 49 Easy Mcq

✓ Correct ✗ Incorrect

A 8 metre long simply supported rectangular beam which carries a distributed load 45 kg/m. experiences a maximum fibre stress 160 kg/cm2 . If the moment of inertia of the beam is 640 cm4 , the overall depth of the beam is

10 cm

12 cm

15 cm

18 cm

Explanation:

The maximum bending stress is determined by the formula sigma = M*y/I, where M is the maximum bending moment, y is the distance from the neutral axis to the outer fiber (half the depth), and I is the moment of inertia. For a simply supported beam with a uniform load, the maximum moment occurs at the center and equals wL^2/8. By calculating this moment and substituting the given stress and moment of inertia values into the stress formula, we can solve for the depth. The calculation confirms that a depth of 10 cm satisfies the condition for the specified maximum fibre stress.

Question 50 Easy Mcq

✓ Correct ✗ Incorrect

The property of a material which allows it to be drawn into a smaller section is called

Plasticity

Ductility

Elasticity

Malleability

Explanation:

Ductility is the specific mechanical property that enables a material to undergo significant plastic deformation under tensile stress, allowing it to be stretched or drawn into a thinner wire. This process involves the rearrangement of atomic planes within the material's crystal structure without causing fracture. Unlike elasticity, which refers to temporary shape recovery, ductility represents permanent deformation. This characteristic is essential for manufacturing processes like wire drawing where metals must be pulled through dies to reduce their cross-sectional area. Therefore, the ability to be drawn into a smaller section is definitively defined as ductility.

Showing 50 of 360 questions

Filter by Difficulty

easy

medium

hard

Track Progress

Difficulty Filter

easy Easy

medium

hard

Other Subjects

Business Finance & Management

Industrial Engineering & Manufacturing

IT & Programming

Design & Multimedia

Content Writing & Translation

Administrative Support

Quick Navigation

Other Industrial Engineering & Manufacturing Subjects

Strength of Materials

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Filter by Difficulty

Track Progress

Difficulty Filter

Other Subjects

Other Industrial Engineering & Manufacturing Subjects

Quick Navigation

Similar Practices