300 Important Engineering Mechanics MCQ Question and Answer | PDF Free Download
1.The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to
- AThe algebraic sum of the resolved parts of the forces in the given direction
- BThe sum of the resolved parts of the forces in the given direction
- CThe difference of the forces multiplied by the cosine of θ
- DThe sum of the forces multiplied by the sine of θ
2.If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is
- Ag/2
- Bg/3
- Cg/4
- DNone of these
3.Angle of friction is the
- AAngle between normal reaction and the resultant of normal reaction and the limiting friction
- BRatio of limiting friction and normal reaction
- CThe ratio of minimum friction force to the friction force acting when the body is just about to move
- DThe ratio of minimum friction force to friction force acting when the body is in motion
4.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.
- AEqual to
- BLess than
- CGreater than
- DNone of these
5.When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.
- ADirectly proportional
- BInversely proportional
- CCube root
- DNone of these
6.The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is
- Ah/(kG² + h²)
- B(kG² + h²)/h
- Ch²/(kG² + h²)
- D(kG² + h²)/h²
7.Non-coplanar non-concurrent forces are those forces which
- AMeet at one point, but their lines of action do not lie on the same plane
- BDo not meet at one point and their lines of action do not lie on the same plane
- CDo not meet at one point but their lines of action lie on the same plane
- DNone of the above
8.Coplanar concurrent forces are those forces which
- AMeet at one point, but their lines of action do not lie on the same plane
- BDo not meet at one point and their lines of action do not lie on the same plane
- CMeet at one point and their lines of action also lie on the same plane
- DDo not meet at one point, but their lines of action lie on the same plane
9.Non-coplanar concurrent forces are those forces which
- AMeet at one point, but their lines of action do not lie on the same plane
- BDo not meet at one point and their lines of action do not lie on the same plane
- CMeet at one point and their lines of action also lie on the same plane
- DDo not meet at one point, but their lines of action lie on the same plane
10.Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
- AAlong the plane
- BHorizontally
- CVertically
- DAt an angle equal to the angle of friction to the inclined plane
11.The ratio of limiting friction and normal reaction is known as
- ACoefficient of friction
- BAngle of friction
- CAngle of repose
- DSliding friction
12.The moment of inertia of a square of side (a) about an axis through its center of gravity is
- Aa4/4
- Ba4/8
- Ca4/12
- Da4/36
13.A number of forces acting at a point will be in equilibrium, if
- AAll the forces are equally inclined
- BSum of all the forces is zero
- CSum of resolved parts in the vertical direction is zero (i.e. ∑V = 0)
- DNone of these
14.When two elastic bodies collide with each other
- AThe two bodies will momentarily come to rest after collision
- BThe two bodies tend to compress and deform at the surface of contact
- CThe two bodies begin to regain their original shape
- DAll of the above
15.A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation
- A6t² - 8t
- B3t² + 2t
- C6f – 8
- D6f – 4
16.The ideal angle of banking provided on the curves on roads depends upon
- AWeight of the vehicle
- B(Velocity)2 of the vehicle
- CNature of the road surface
- DCoefficient of friction between the road and vehicle contact point
17.In the lever of third order, load ‘W’, effort ‘P’ and fulcrum ‘F’ are oriented as follows
- AW between P and F
- BF between W and P
- CP between W and F
- DW, P and F all on one side
18.The Centre of gravity of a solid cone lies on the axis at the height
- AOne fourth of the total height above base
- BOne third of the total height above base
- COne-half of the total height above base
- DThree eighth of the total height above the base
19.D' Alembert's principle is used for
- AReducing the problem of kinetics to equivalent statics problem
- BDetermining stresses in the truss
- CStability of floating bodies
- DDesigning safe structures
20.A pendulum which executes one beat per second is known as
- ASimple pendulum
- BCompound pendulum
- CTorsional pendulum
- DSecond's pendulum