Civil Engineering MCQs

2965 MCQs  (Page 93 of 297)

Center of percussion is______________?
A. The point of c.g.
B. The point of metacentre
C. The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
D. Point of suspension
The center of gravity of a uniform lamina lies at_______________?
A. The center of heavy portion
B. The bottom surface
C. The mid point of its axis
D. All of the above
The product of either force of couple with the arm of the couple is called________________?
A. Resultant couple
B. Moment of the forces
C. Resulting couple
D. Moment of the couple
Two coplanar couples having equal and op-posite moments_________________?
A. balance each other
B. produce a couple and an unbalanced force
C. are equivalent
D. produce a moment of couple
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
A. The floor is smooth, the wall is rough
B. The floor is rough, the wall is smooth
C. The floor and wall both are smooth surfaces
D. The floor and wall both are rough sur-faces
If a rigid body is in equilibrium under the action of three forces, then_______________?
A. These forces are equal
B. The lines of action of these forces meet in a point
C. The lines of action of these forces are parallel
D. B. and c. above
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
According to law of triangle of forces______________?
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 patticle 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
Two non-collinear parallel equal forces acting in opposite direction________________?
A. Balance each other
B. Constitute a moment
C. Constitute a couple
D. Constitute a moment of couple