EM_Z-section_Quiz1-20May2021

Moment of inertia is lowest if it is taken about an axis passing through

• Base of the section

• Centroid of the section

• Top most point of the section

• Origin of the section

A force while acting on a body may

• change its motion

• balance the forces, already acting on it

• give rise to the internal stresses in it

• all of these

When the diameter of circular section is doubled, its radius of gyration is

• reduced to half

• reduced by 8 times

• is doubled

• increased by 8 times

The product of either force of couple with the arm of the couple is called

• Resultant couple

• Moment of the forces

• Resulting couple

• Moment of the couple

Which of the following conditions should be satisfied for co-planer concurrent forces to be in equilibrium?

• Σ Fx = Σ Fy = 0

• Σ M = 0

• Both a. and b.

• None of the above

Indeterminate structures have number of unknown quantities _________ available conditions of equilibrium.

• equal to

• less than

• more than

• none of the above

A framed structure is perfect, if the number of members are __________ (2j - 3).

• equal to

• less than

• greater than

• All of the above

The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called

• angle of repose

• angle of friction

• angle of inclination

• none of these.

Lami's theroem states that

• three forces acting at a point are always in equilibrium

• if three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium

• three coplaner forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two

• three coplaner forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two

If two forces P and Q (P > Q) act on the same straight line but in opposite direction, their resultant, is

• P + Q

• P/Q

• Q/P

• P - Q

• Q - P.