Question 31. Which one of the following statements is not correct

Question 32. If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be

Question 33. 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

Question 34. The unit of force in s.i. units is

Question 35. Center of percussion is

Question 36. 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

Question 37. If three forces acting in different planes can be represented by a triangle, these will be in

Question 38. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than

Question 39. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

Question 40. The magnitude of two forces, which when acting at right angle produce resultant force of vlokg and when acting at 60° produce resultant of vl3 kg. these forces are