300 Important Engineering Mechanics MCQ Question and Answer | PDF Free Download
1.The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.
- AEqual to
- BLess than
- CGreater than
- DNone of these
2.In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
- A50
- B100
- C200
- D400
3.The time of flight of a projectile on downward inclined plane depends upon
- AAngle of projection
- BAngle of inclination of the plane
- CBoth (A) and (B)
- DNone of these
4.Center of gravity of a thin hollow cone lies on the axis at a height of
- 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
5.According to principle of transmissibility of forces, the effect of a force upon a body is
- Amaximum when it acts at the center of gravity of a body
- Bdifferent at different points in its line of action
- Cthe same at every point in its line of action
- Dminimum when it acts at the C.G. of the body
6.The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is
- A2mr²/3
- B2mr²/5
- Cmr²
- Dmr²/2
7.A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve
- ACircular arc
- BParabola
- CHyperbola
- DElliptical
8.The maximum frictional force which comes into play when a body just begins to slide over another surface is called
- ALimiting friction
- BSliding friction
- CRolling friction
- DKinematic friction
9.The velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is
- ASinθ
- BCosθ
- CTanθ
- DCosecθ
10.The forces, whose lines of action are parallel to each other and act in the same directions, are known as
- ACoplanar concurrent forces
- BCoplanar non-concurrent forces
- CLike parallel forces
- DUnlike parallel forces
11.Which of the following is not the unit of energy?
- Akg m
- Bkcal
- CWatt
- DWatt hours
12.When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is
- AMv2
- BMgv2
- C0.5 mv2
- D0.5 mgv2
13.The C.G. of a right circular solid cone of height h lies at a distance from the base is
- Ah/2
- BJ/3
- Ch/6
- Dh/4
14.Which of the following are vector quantities?
- ALinear displacement and Angular displacement
- BLinear velocity and Angular velocity
- CLinear acceleration and Angular acceleration
- DAll of these
15.Which of the following is the example of lever of first order?
- AArm of man
- BPair of scissors
- CPair of clinical tongs
- DAll of the above
16.A couple produces
- ATranslatory motion
- BRotational motion
- CCombined translatory and rotational motion
- DNone of the above
17.The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be
- A20 kg, -ve sense
- B20 kg, + ve sense
- C10 kg, + ve sense
- D10 kg, -ve sense
18.A smooth cylinder lying on a __________ is in neutral equilibrium.
- ACurved surface
- BConvex surface
- CHorizontal surface
- DNone of these
19.Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is
- Adb³/12
- Bbd³/12
- Cdb³/36
- Dbd³/36
20.Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is
- Adb³/12
- Bbd³/12
- Cdb³/36
- Dbd³/36