According to law of triangle of forces______________?

Related Mcqs:

1. If three forces acting in different planes can be represented by a triangle, these will be in________________?

   A. non-equilibrium
   B. partial equilibrium
   C. full equilibrium
   D. unpredictable
   E. none of the above

2. The center of gravity of a triangle lies at the point of__________________?

   A. concurrence of the medians
   B. intersection of its altitudes
   C. intersection of bisector of angles
   D. intersection of diagonals
   E. all of the above

3. Which is the correct statement about law of polygon of forces ?

   A. if any number of forces acting at a point can be represented by the sides
   of a polygon taken in order, then the forces are in equilibrium
   B. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
   C. if a polygon representing forces acting at a point is closed then forces are in equilibrium
   D. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
   E. none of the above

4. According to principle of transmissibility of forces, the effect of a force upon a body is_______________?

   A. maximum when it acts at the center of gravity of a body
   B. different at different points in its line of action
   C. the same at every point in its line of action
   D. minimum when it acts at the C.G. of the body
   E. none of the above

5. According to Lami’s theorem________________?

   A. three forces acting at a point will be in equilibrium
   B. three forces acting at a point can be represented by a triangle, each side being proportional to force
   C. if three forces acting upon a particle are represented in magnitude and
   direction by the sides of a triangle, taken in order, they will be in equilibrium
   D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
   E. none of the above

6. According to principle of moments_________________?

   A. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
   B. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
   C. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
   D. positive and negative couples can be balanced
   E. none of the above

7. Which of the following is not the unit of power ?

   A. kW (kilowatt)
   B. hp (horse power)
   C. kcal/sec
   D. kg m/sec
   E. kcal/kg sec

8. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve___________________?

   A. catenary
   B. parabola
   C. hyperbola
   D. elliptical
   E. circular arc

9. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?

   A. remain horizontal
   B. slant up towards direction of pull
   C. slant down towards direction of pull
   D. unpredictable
   E. none of the above

10. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to______________?

    A. 25
    B. 50
    C. 100
    D. 250
    E. 500