300 Important Engineering Mechanics MCQ Question and Answer | PDF Free Download
1.The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is
- AD/(d₁ + d₂)
- BD/(d₁ - d₂)
- C2D/(d₁ + d₂)
- D2D/(d₁ - d₂)
2.A body will begin to move down an inclined plane if the angle of inclination of the plane is _________ the angle of friction.
- ALess than
- BEqual to
- CGreater than
- DNone of these
3.Pick up wrong statement about friction force for dry surfaces. Friction force is
- AProportional to normal load between the surfaces
- BDependent on the materials of contact surface
- CProportional to velocity of sliding
- DIndependent of the area of contact surfaces
4.Which of the following is not the unit of power?
- AkW (kilowatt)
- Bhp (horse power)
- Ckcal/sec
- Dkcal/kg sec
5.Which of the following is not a vector quantity?
- AWeight
- BVelocity
- CAcceleration
- DForce
6.Which of the following is not a scalar quantity?
- AMass
- BVolume
- CDensity
- DAcceleration
7.The coefficient of restitution for inelastic bodies is
- AZero
- BOne
- CBetween zero and one
- DMore than one
8.The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.
- ALess than
- BMore than
- CEqual to
- DNone of These
9.The centre of gravity of a uniform lamina lies at
- AThe centre of heavy portion
- BThe bottom surface
- CThe midpoint of its axis
- DAll of the above
10.A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of
- Ar/2
- Br/A
- Cr/3
- D0.134 r
11.The maximum velocity of a particle moving with simple harmonic motion is
- AΩ
- BΩr
- Cω2r
- Dω/r
12.If the gravitational acceleration at any place is doubled, then the weight of a body will be
- Ag/2
- Bg
- C√2.g
- D2g
13.Effect of a force on a body depends upon
- AMagnitude
- BDirection
- CPosition or line of action
- DAll of the above
14.The rate of change of displacement of a body is called
- AVelocity
- BAcceleration
- CMomentum
- DNone of these
15.The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.
- A3r/ 8
- B4r/ 3π
- C8r/3
- D3r/4π
16.Which of the following is a vector quantity?
- AEnergy
- BMass
- CMomentum
- DAngle
17.Which of the following is a scalar quantity?
- AForce
- BSpeed
- CVelocity
- DAcceleration
18.A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
- A25
- B50
- C250
- D100
19.If three forces acting in different planes can be represented by a triangle, these will be in
- ANon-equilibrium
- BPartial equilibrium
- CFull equilibrium
- DUnpredictable
20.The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is
- Amr²/2
- Bmr²/4
- Cmr²/6
- Dmr²/8