**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

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