ENGINEERING MECHANICS QUIZ

Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)

All of these

s = u.t + ½ a.t2

v2 = u2 + 2a.s

v = u + a.t

TRUE ANSWER : ?
YOUR ANSWER : ?

Moment of inertia of a circular section about its diameter (d) is

πd4/64

πd4/32

πd3/16

πd3/32

TRUE ANSWER : ?
YOUR ANSWER : ?

A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Towards the wall at its upper end

Away from the wall at its upper end

Downward at its upper end

Upward at its upper end

TRUE ANSWER : ?
YOUR ANSWER : ?

Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

Twice the area of the triangle

Area of the triangle

Half the area of the triangle

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Static friction is always __________ dynamic friction.

Less than

Equal to

None of these

Greater than

TRUE ANSWER : ?
YOUR ANSWER : ?

The total energy possessed by a system of moving bodies

Is constant at every instant

Is minimum in the start and maximum at the end

Varies from point to point

Is maximum in the start and minimum at the end

TRUE ANSWER : ?
YOUR ANSWER : ?

The static friction

Always acts in a direction, opposite to that in which the body tends to move

Bears a constant ratio to the normal reaction between the two surfaces

Is independent of the area of contact, between the two surfaces

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

None of these

Greater than

Equal to

Less than

TRUE ANSWER : ?
YOUR ANSWER : ?

The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

a = α/ r

None of these

a = α.r

a = r / α

TRUE ANSWER : ?
YOUR ANSWER : ?

Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

Their algebraic sum is zero

Their lines of action are at equal distances

The algebraic sum of their moments about any point in their plane is zero

TRUE ANSWER : ?
YOUR ANSWER : ?