three forces acting at a point will be in equilibrium
three forces acting at a point can be represented by a triangle, each side being proportional to force
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
if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
none of the above.
Correct answer: (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
22. According to law of triangle of forces
three forces acting at a point will be in equilibrium
three forces acting at a point can be represented by a triangle, each side being proportional to force
if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
none of the above.
Correct answer: (C) if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
23. According to principle of moments
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
positive and negative couples can be balanced
none of the above.
Correct answer: (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
24. According to principle of transmissibility of forces, the effect of a force upon a body is
maximum when it acts at the center of gravity of a body
different at different points in its line of action
the same at every point in its line of action
minimum when it acts at the C.G. of the body
none of the above.
Correct answer: (C) the same at every point in its line of action
25. Angle of friction is the
angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reaction
the ratio of minimum friction force to the friction force acting when the body is just about to move
the ratio of minimum friction force to friction force acting when the body is in motion
ratio of static and dynamic friction.
Correct answer: (A) angle between normal reaction and the resultant of normal reaction and the limiting friction
26. Center of gravity of a solid cone lies on the axis at the height
one-fourth of the total height above base
one-third of the total height above base
one-half of the total height above base
three-eighth of the total height above the base
none of the above.
Correct answer: (A) one-fourth of the total height above base
27. Center of gravity of a thin hollow cone lies on the axis at a height of
one-fourth of the total height above base
one-third of the total height above base
one-half of the total height above base
three-eighth of the total height above the base
none of the above.
Correct answer: (B) one-third of the total height above base
28. Center of percussion is
the point of C.G.
the point of metacentre
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
point of suspension
the point in a body about which it can rotate horizontally and oscillate under the influence of gravity.
Correct answer: (C) the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
29. Coefficient of friction is the
angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move
the friction force acting when the body is in motion
tangent of angle of repose.
Correct answer: (B) ratio of limiting friction and normal reaction