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Engineering Mechanics

Free 83+ Engineering Mechanics MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Engineering Mechanics

Practice questions

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1.What are the units used to measure the moment of inertia of a mass?

kilogram meter squared (kg·m²)meter to the fourth power (m⁴)kilogram per square meter (kg/m²)kilogram per meter (kg/m)square meter per kilogram (m²/kg)

2.At what fraction of its height from the base is the center of gravity located for a thin hollow cone along its central axis?

One-quarter of the total height measured from the baseOne-third of the total height measured from the baseHalf of the total height measured from the baseThree-eighths of the total height measured from the baseNone of these

3.For a uniform rod of length L hanging from its top end, where is the center of percussion located?

Half the length (L/2)One-third of the length (L/3)Three-quarters of the length (3L/4)Two-thirds of the length (2L/3)Three-eighths of the length (3L/8)

4.Where is the center of gravity located along the axis of a solid cone relative to its base height?

At one-quarter of the cone's total height measured from the baseAt one-third of the cone's total height measured from the baseAt half of the cone's total height measured from the baseAt three-eighths of the cone's total height measured from the baseNone of the above

5.What are the units used to measure the moment of inertia of an area?

kilogram meter squared (kg·m²)meters to the fourth power (m⁴)kilograms per square meter (kg/m²)cubic meters (m³)kilograms per meter to the fourth power (kg/m⁴)

6.What is meant by the center of percussion?

The location of the center of gravityThe position known as the metacentreThe point where the combined forces causing rotation about an axis actThe suspension point of the objectThe spot around which a body swings horizontally under gravity

7.Where is the center of gravity located in a uniform lamina?

At the heaviest sectionAlong the lower edgeAt the midpoint of its axisAny of the aboveNone of these

8.What is the term for the product of the magnitude of one force in a couple and the perpendicular distance between the forces?

net coupletorque of the forcescombined couplemoment of the couplenone of these

9.What does Lami’s theorem state regarding three forces acting at a single point?

Three forces meeting at a point are always balanced.Three forces at a point can be depicted as a triangle with sides proportional to the forces.If three forces acting on a particle are shown in magnitude and direction by the sides of a triangle, they will be balanced.When three forces at a point are in equilibrium, each force is proportional to the sine of the angle formed between the other two forces.None of these statements are correct.

10.What is the primary application of D’Alembert’s principle?

Transforming kinetic problems into equivalent static problemsCalculating stresses within truss structuresAnalyzing the stability of floating objectsEnsuring the design of structurally safe constructionsAddressing problems related to motion without forces

11.What does the law of the triangle of forces state?

Three forces applied at a single point will always balance each other.Three forces acting at a point can be depicted as a triangle, with each side proportional to the corresponding force.If three forces acting on a particle are represented in both magnitude and direction by the sides of a triangle taken consecutively, the forces will be in equilibrium.When three forces at a point are balanced, each force is proportional to the sine of the angle formed by the other two forces.None of the above statements are correct.

12.Identify the quantity from the list below that is a vector.

energymassmomentumanglespeed

13.What do we call forces that converge at a single point but whose lines of action do not lie within the same plane?

forces that lie in one plane but do not meet at a pointforces that intersect at a point yet are not on the same planeforces neither on the same plane nor meeting at a pointforces that cross each othernone of these options

14.What do two equal, parallel forces acting in opposite directions but not along the same line form?

neutralize one anothercreate a momentform a couplegenerate a moment of coupleproduce a resultant couple

15.Identify the option that does not represent a vector quantity:

weightspeedaccelerationforcetorque

16.Under which condition might a heavy ladder leaning against a vertical wall and resting on the floor fail to remain in equilibrium?

The floor has a rough surface while the wall is smoothThe floor is smooth and the wall is roughBoth the floor and the wall have smooth surfacesBoth the floor and the wall are roughThe ladder will always be in equilibrium regardless of surface conditions

17.When a rigid body is balanced under the influence of three forces, what must be true about these forces?

The magnitudes of the three forces are identicalThe forces act along lines that intersect at a single pointAll three forces have parallel lines of actionBoth B and C are correctNone of the statements above are true

18.What does the principle of moments state?

If coplanar forces are balanced, their total sum equals zero.For a system of coplanar forces in equilibrium, the sum of their moments about any point in the plane is zero.The combined moment of two forces about a point equals the moment of their resultant force at that point.Positive and negative couples can counteract each other.None of the above statements are correct.

19.Under what condition will multiple forces acting at a single point be in a state of equilibrium?

When their overall vector sum equals zeroIf the components along two perpendicular axes are identicalWhen the sum of the force components along any two mutually perpendicular directions is zeroIf all forces have the same angle of inclinationNone of the listed conditions apply

20.What does the principle of transmissibility of forces state about the effect of a force on a body?

It is greatest when applied at the body's center of gravityIt varies depending on the point along its line of actionIt remains unchanged at any point along its line of actionIt is least when acting at the center of gravity of the bodyNone of the above

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How to prepare with Engineering Mechanics MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
Pair subject practice with past papers to see how Engineering Mechanics appears in real exam conditions.

Engineering Mechanics

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Practice questions

1.What are the units used to measure the moment of inertia of a mass?

2.At what fraction of its height from the base is the center of gravity located for a thin hollow cone along its central axis?

3.For a uniform rod of length L hanging from its top end, where is the center of percussion located?

4.Where is the center of gravity located along the axis of a solid cone relative to its base height?

5.What are the units used to measure the moment of inertia of an area?

6.What is meant by the center of percussion?

7.Where is the center of gravity located in a uniform lamina?

8.What is the term for the product of the magnitude of one force in a couple and the perpendicular distance between the forces?

9.What does Lami’s theorem state regarding three forces acting at a single point?

10.What is the primary application of D’Alembert’s principle?

11.What does the law of the triangle of forces state?

12.Identify the quantity from the list below that is a vector.

13.What do we call forces that converge at a single point but whose lines of action do not lie within the same plane?

14.What do two equal, parallel forces acting in opposite directions but not along the same line form?

15.Identify the option that does not represent a vector quantity:

16.Under which condition might a heavy ladder leaning against a vertical wall and resting on the floor fail to remain in equilibrium?

17.When a rigid body is balanced under the influence of three forces, what must be true about these forces?

18.What does the principle of moments state?

19.Under what condition will multiple forces acting at a single point be in a state of equilibrium?

20.What does the principle of transmissibility of forces state about the effect of a force on a body?

How to prepare with Engineering Mechanics MCQs

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