PEC EPE Exam MCQ Questions for Engineering Mechanics
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In Engineering Mechanics, the study of forces and their effects on bodies is known as:
a) Statics
b) Dynamics
c) Thermodynamics
d) Kinematics
Answer: a) Statics
The branch of Engineering Mechanics that deals with the motion of bodies without considering the forces causing the motion is called:
a) Statics
b) Kinematics
c) Dynamics
d) Thermodynamics
Answer: b) Kinematics
The resultant of two concurrent forces acting on a body can be found using:
a) Triangle Law of Forces
b) Parallelogram Law of Forces
c) Polygon Law of Forces
d) Law of Cosines
Answer: b) Parallelogram Law of Forces
The moment of a force about a point is the:
a) Product of force magnitude and distance perpendicular to the force line
b) Product of force magnitude and distance parallel to the force line
c) Product of force magnitude and distance along the force line
d) Sum of force magnitude and distance perpendicular to the force line
Answer: a) Product of force magnitude and distance perpendicular to the force line
The principle stating that a body remains at rest or in uniform motion unless acted upon by an external force is known as:
a) Newton’s First Law of Motion
b) Newton’s Second Law of Motion
c) Newton’s Third Law of Motion
d) Archimedes’ Principle
Answer: a) Newton’s First Law of Motion
The force that a body exerts against gravity is called:
a) Inertia force
b) Reaction force
c) Weight
d) Tension force
Answer: c) Weight
The acceleration produced by a force acting on a body is directly proportional to the force and inversely proportional to the mass of the body. This statement is known as:
a) Newton’s First Law of Motion
b) Newton’s Second Law of Motion
c) Newton’s Third Law of Motion
d) Newton’s Law of Universal Gravitation
Answer: b) Newton’s Second Law of Motion
The force required to keep a body moving with a constant velocity on a frictionless surface is:
a) Kinetic friction
b) Static friction
c) Rolling friction
d) No friction is required
Answer: b) Static friction
The force that opposes the relative motion or tendency of such motion of two surfaces in contact is called:
a) Kinetic friction
b) Static friction
c) Rolling friction
d) Restoring friction
Answer: a) Kinetic friction
The weight of an object of mass ‘m’ is given by:
a) m * g
b) m / g
c) g / m
d) g * m^2
Answer: a) m * g
The condition of equilibrium for a particle requires that:
a) The resultant force and moment about any point must be zero
b) The resultant force and moment about any point must be equal
c) The resultant force and moment about any point must be constant
d) The resultant force and moment about any point must be opposite
Answer: a) The resultant force and moment about any point must be zero
The property of a body to resist changes in its rotational motion is called:
a) Mass
b) Inertia
c) Weight
d) Force
Answer: b) Inertia
The moment of inertia of a body depends on:
a) The mass of the body only
b) The shape and mass distribution of the body
c) The weight of the body only
d) The volume of the body only
Answer: b) The shape and mass distribution of the body
The force acting on an object moving in a circle at constant speed is directed:
a) Towards the center of the circle
b) Away from the center of the circle
c) Tangential to the circle
d) Perpendicular to the plane of the circle
Answer: a) Towards the center of the circle
The moment of inertia of a disc of mass ‘m’ and radius ‘r’ about its central axis is given by:
a) (1/2) * m * r^2
b) (1/3) * m * r^2
c) (1/4) * m * r^2
d) m * r^2
Answer: b) (1/3) * m * r^2
The torque required to produce angular acceleration in a body is equal to:
a) Mass times acceleration
b) Force times distance from the axis of rotation
c) Moment of inertia times angular acceleration
d) Mass times distance from the axis of rotation
Answer: c) Moment of inertia times angular acceleration
Which of the following statements is true about a body in equilibrium?
a) The body is always at rest.
b) The body is always in motion with constant velocity.
c) The body has balanced forces and moments acting on it.
d) The body has unbalanced forces and moments acting on it.
Answer: c) The body has balanced forces and moments acting on it.
The point of application of a force on a body is called:
a) Axis
b) Center of mass
c) Line of action
d) Moment arm
Answer: c) Line of action
The moment of a force about a point is also known as:
a) Torque
b) Resultant force
c) Moment arm
d) Static friction
Answer: a) Torque
Which law of motion states that the rate of change of momentum of a body is directly proportional to the net external force acting on it?
a) Newton’s First Law of Motion
b) Newton’s Second Law of Motion
c) Newton’s Third Law of Motion
d) Newton’s Law of Universal Gravitation
Answer: b) Newton’s Second Law of Motion
The sum of the moments of all the forces acting on a body about any point is equal to zero. This condition is known as:
a) Mechanical equilibrium
b) Translational equilibrium
c) Rotational equilibrium
d) Static equilibrium
Answer: c) Rotational equilibrium
The distance from the axis of rotation to the point of application of the force is called:
a) Torque
b) Moment arm
c) Resultant force
d) Equilibrium
Answer: b) Moment arm
The force that opposes the relative motion or tendency of such motion between two surfaces in contact is called:
a) Static friction
b) Kinetic friction
c) Rolling friction
d) Tension force
Answer: a) Static friction
The moment of inertia of a thin rod of mass ‘m’ and length ‘L’ about an axis passing through one end and perpendicular to its length is:
a) (1/3) * m * L^2
b) (1/4) * m * L^2
c) (1/12) * m * L^2
d) m * L^2
Answer: c) (1/12) * m * L^2
The force acting on an object moving in a circle at constant speed is called:
a) Centrifugal force
b) Centripetal force
c) Gravity force
d) Normal force
Answer: b) Centripetal force
The tendency of a body to resist any change in its state of motion is called:
a) Mass
b) Weight
c) Inertia
d) Force
Answer: c) Inertia
The condition of equilibrium for a particle requires that:
a) The resultant force and moment about any point must be zero.
b) The resultant force and moment about any point must be constant.
c) The resultant force and moment about any point must be opposite.
d) The resultant force and moment about any point must be equal.
Answer: a) The resultant force and moment about any point must be zero.
The weight of an object of mass ‘m’ is given by:
a) m * g
b) m / g
c) g / m
d) g * m^2
Answer: a) m * g
The friction experienced by an object in motion on a surface is called:
a) Static friction
b) Kinetic friction
c) Rolling friction
d) Limiting friction
Answer: b) Kinetic friction
The moment of inertia of a disc of mass ‘m’ and radius ‘r’ about its central axis is given by:
a) (1/2) * m * r^2
b) (1/3) * m * r^2
c) (1/4) * m * r^2
d) m * r^2
Answer: b) (1/3) * m * r^2
The force required to keep a body moving with a constant velocity on a frictionless surface is:
a) Kinetic friction
b) Static friction
c) Rolling friction
d) No friction is required
Answer: b) Static friction
Which of the following is a scalar quantity?
a) Force
b) Velocity
c) Acceleration
d) Displacement
Answer: d) Displacement
The line of action of a force passes through a point of rotation. The moment arm of that force about the point of rotation is:
a) Infinite
b) Zero
c) Unity
d) One
Answer: b) Zero
If a body is in translational equilibrium, it implies that the body:
a) Is at rest
b) Is moving with constant velocity
c) Has no external force acting on it
d) Has balanced forces acting on it
Answer: d) Has balanced forces acting on it
The moment of inertia depends on the:
a) Mass of the body only
b) Shape and size of the body only
c) Shape and mass distribution of the body
d) Volume of the body only
Answer: c) Shape and mass distribution of the body