300 Important Engineering Mechanics MCQ Question and Answer | PDF Free Download
1.Kinetic friction is the
- ATangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
- BRatio of limiting friction and normal reaction
- CThe friction force acting when the body is just about to move
- DThe friction force acting when the body is in motion
2.When trying to turn a key into a lock, which of the following is applied?
- ACoplanar force
- BNon-coplanar forces
- CMoment
- DCouple
4.In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
- AP = W tan (α - φ)
- BP = W tan (α + φ)
- CP = W tan (φ - α)
- DP = W cos (α + φ)
5.The loss of kinetic energy during inelastic impact, is given by (where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)
- A[m₁ m₂/2(m₁ + m₂)] (u₁ - u₂)²
- B[2(m₁ + m₂)/m₁ m₂] (u₁ - u₂)²
- C[m₁ m₂/2(m₁ + m₂)] (u₁² - u₂²)
- D[2(m₁ + m₂)/m₁ m₂] (u₁² - u₂²)
6.Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
- AEllipse
- BHyperbola
- CParabola
- DCircle
7.The possible loading in various members of framed structures are
- ACompression or tension
- BBuckling or shear
- CShear or tension
- DAll of the above
8.The forces, which meet at one point, but their lines of action do not lie in a plane, are called
- ACoplanar non-concurrent forces
- BNon-coplanar concurrent forces
- CNon-coplanar non-concurrent forces
- DIntersecting forces
9.The range of projectile (R) on an upward inclined plane is
- Ag. cos² β/2u². sin (α + β). cos α
- B2u². sin (α + β). cos α/g. cos² β
- Cg. cos² β/2u². sin (α - β). cos α
- D2u². sin (α - β). cos α/g. cos² β
10.Moment of inertia of a circular section about its diameter (d) is
- AΠd3/16
- BΠd3/32
- CΠd4/32
- DΠd4/64
11.Lami's theorem states that
- AThree forces acting at a point will be in equilibrium
- BThree forces acting at a point can be represented by a triangle, each side being proportional to force
- CIf three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
- DIf three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
12.On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be
- ADownwards at its upper end
- BUpwards at its upper end
- CPerpendicular to the wall at its upper end
- DZero at its upper end
13.On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be
- ATowards the wall at its upper end
- BAway from the wall at its upper end
- CUpwards at its upper end
- DDownwards at its upper end
14.The unit of moment of inertia of an area is
- Akg-m2
- Bkg-m-s2
- Ckg/m2
- Dm4
15.If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.
- AFirst
- BSecond
- CThird
- DNone of these
16.The C.G. of a solid hemisphere lies on the central radius 3r
- AAt distance 3r/2 from the plane base
- BAt distance 3r/4 from the plane base
- CAt distance 3r/5 from the plane base
- DAt distance 3r/8 from the plane base
17.A force is completely defined when we specify
- AMagnitude
- BDirection
- CPoint of application
- DAll of the above
18.The slope on the road surface generally provided on the curves is known as
- AAngle of friction
- BAngle of repose
- CAngle of banking
- DNone of these
19.Coulomb friction is the friction between
- ABodies having relative motion
- BTwo dry surfaces
- CTwo lubricated surfaces
- DSolids and liquids
20.Limiting force of friction is the
- ATangent of angle between normal reaction and the resultant of normal reaction and limiting friction
- BRatio of limiting friction and normal reaction
- CThe friction force acting when the body is just about to move
- DThe friction force acting when the body is in motion