Related Questions

The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.
A Change
B Does not change
C Changes periodically
D None of these
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
A simple pendulum
B torsional pendulum
C compound pendulum
D second’s pendulum
When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
A Simple pendulum
B Compound pendulum
C Torsional pendulum
D Second's pendulum
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
A Meet in a point
B Be all parallel
C At least two of them must meet
D All the above are correct
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 Both (B) and (C)
Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and
A Concurrent
B Parallel
C Concurrent parallel
D None of these
The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at
A the centre of the disc
B the point of contact
C an infinite distance on the plane surface
D the point on the circumference situated vertically opposite to the contact point
The conditions for the stable equilibrium of a floating body are
A The metacentre should lie above the center of gravity
B The center of buoyancy and the center of gravity must lie on the same vertical line
C A righting couple should be formed
D All the above are correct
For a floating body to be in stable equilibrium, its metacentre should be
A below the center of buoyancy
B above the center of buoyancy
C between e.g. and center of pressure
D above the center of gravity.

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