300 Important Engineering Mechanics MCQ Question and Answer | PDF Free Download
1.The coefficient of friction depends upon
- ANature of surfaces
- BArea of contact
- CShape of the surfaces
- DAll of the above
2.The energy possessed by a body, for doing work by virtue of its position, is called
- APotential energy
- BKinetic energy
- CElectrical energy
- DChemical energy
3.The friction experienced by a body, when at rest, is known as
- AStatic friction
- BDynamic friction
- CLimiting friction
- DCoefficient of friction
4.The condition of equilibrium for any system of coplanar forces is that the
- AAlgebraic sum of the horizontal components of all the forces should be zero
- BAlgebraic sum of the vertical components of all the forces should be zero
- CAlgebraic sum of moments of all the forces about any point should be zero
- DAll of the above
5.According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)
- AIP = IG + Ah2
- BIP = IG - Ah2
- CIP = IG / Ah2
- DIP = Ah2 / IG
6.The efficiency of a lifting machine is the ratio of
- AOutput to the input
- BWork done by the machine to the work done on the machine
- CMechanical advantage to the velocity ratio
- DAll of the above
7.The mechanical advantage of a lifting machine is the ratio of
- ADistance moved by effort to the distance moved by load
- BLoad lifted to the effort applied
- COutput to the input
- DAll of the above
8.The angle between two forces when the resultant is maximum and minimum respectively are
- A0° and 180°
- B180° and 0°
- C90° and 180°
- D90° and 0°
9.The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.
- ALess than
- BGreater than
- CEqual to
- DNone of these
10.Moment of inertia of a circular section about an axis perpendicular to the section is
- Aπd3/16
- Bπd3/32
- Cπd4/32
- Dπd4/64
11.The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is
- Aa = α/ r
- Ba = α.r
- Ca = r / α
- DNone of these
12.If a number of forces are acting at a point, their resultant is given by
- A(∑V)2 + (∑H)2
- B√[(∑V)2 + (∑H)2]
- C(∑V)2 +(∑H)2 +2(∑V)(∑H)
- D√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
13.A framed structure is perfect, if the number of members are __________ (2j - 3)( where j is the number of joints).
- AEqual to
- BLess than
- CGreater than
- DNone of these
14.The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by
- A2P sinθ/2
- B2P cosθ/2
- C2P tanθ/2
- D2P cotθ/2
15.The maximum height of a projectile on a horizontal plane, is
- Au² sin²α/2g
- Bu² cos²α/2g
- Cu² sin²α/g
- Du² cos²α/g
16.A framed structure is imperfect, if the numbers of members are __________ (2j - 3).
- AEqual to
- BLess than
- CGreater than
- DEither (B) or (C)
17.If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.
- AChange
- BDoes not change
- CChanges periodically
- DNone of these
18.The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)
- Aω.√(y² - r²)
- Bω.√(r² - y²)
- Cω².√(y² - r²)
- Dω².√(r² - y²)
19.The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)
- A2π. √(gh/kG² + h²)
- B2π. √(kG² + h²/gh)
- C1/2π. √(gh/kG² + h²)
- D1/2π. √(kG² + h²/gh)
20.When the spring of a watch is wound, it will possess
- AStrain energy
- BKinetic energy
- CHeat energy
- DElectrical energy