1. A zero angle of friction implies that:
- Fictional force is infinite
- Fictional force acts normal to the plane
- Frictional force along the direction of motion
- Frictional force is zero
2. A body of weight 'W' is placed on a rough inclined plane. The inclination of the plane with the horizontal is less than the angle of friction. The body is less than angle of friction. The body will :
- Move downwards
- Move upwards
- Be in equilibrium
- None of the above
3. Coulomb friction is the friction between ____ surface.
- Bet
- Dry
- Both 1 and 2
- None of the above
4. A 1 kg block is resting an a horizontal surface with coefficient of friction u = 0.1. A force of 0.8N is applied to each block parallel to the horizontal plane. The frictional forces is :
- 0.98 N
- 1.2 N
- 0.8 N
- Zero
5. First moment of an area about x - axis is _____.
- ∫xdA
- ∫ydA
- ∫zdA
- ∫y²dA
6. The position of centre of gravity of a solid hemisphere of radius 'r' lies on the control radius at a distance _____ from the plane base.
- 3r/8
- 3r/4
- 3r/5
- r/2
7. The centre of gravity of a solid circular cone divides the axis in the ratio of ______.
- 4:1
- 1:2
- 3:1
- 1:4
8. The centroid of a triangle is the point of intersection of its _______ .
- Altitudes
- Bisector of angles
- Medians
- All of the above
9. If the efficiency of a lifting machine is kept constant, its velocity ratio is _____ to its mechanical advantages.
- Inversely proportional
- Directly proportional
- Both a and b
- None of these
10. The law of machines is an equation that shows the relation between :
- Efficiency and velocity ratio
- Mechanical advantage and velocity ratio
- Effort and velocity ratio
- Effort applied and load lifted
11. A weight of 1 kilo newton is lifted by an effort of 80 Newton. If the velocity ratio is 20, then machine is :
- Ideal
- Reversible
- Non reversible
- None of these
12. The velocity ratio of a single purchase winch crab can be increased by ______.
- Increasing the radius of the load drum.
- Increasing the number of teeth of the pinion.
- Increasing the length of the handle.
- All of the above
13. A beam supported on more than two supporters is called :
- Fixed beam
- Continuous beam
- Overhanging beam
- Simply supported beam
14. The number of reaction possible at hinge support for the general loading are:
- 4
- 3
- 2
- 1
15. The moment of a couple is a ______.
- Fixed vector
- Bound vector
- Free vector
- Sliding vector
16. The forces, whose lines of action are parallel to each other and act in the same directions are known as :
- Unlike parallel forces
- Like parallel forces
- Coplanar concurrent forces
- Coplanar non concurrent forces
17. The resultant of two equal forces 'P' acting at angle A is:
- 2Psin A/2
- 2Ptan A/2
- 2Pcot A/2
- 2Pcos A/2
18. A force acting on a body may _____.
- Retard its motion
- Induce internal stress
- Charge its motion
- All of the above
19. A number of forces are acting at a point to keep the body in equilibrium, then ______ .
- Sum of the forces is zero
- Algebraic sum of the forces is zero
- Sum of the resolved part is zero
- Sum of the resolved parts in any two mutually perpendicular direction is zero.
20. Principle of transmissibility for free body diagram.
- States that the forces acting on the body is a rolling vector.
- States that the force acting on the body is a sliding vector.
- Both 1 and 2
- None of these
Engineering Mechanics 2021 (Even)
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