Mechanical Properties of Solids Quiz 4

If work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of same material, but with double the radius and half the length by 1 mm in joule is

When the load on a wire is slowly increased from 3 to 5 kg wt, the elongation increases from 0.61 to 1.02 mm. The work done during the extension of wire is

A body lies on a table. Its weight is balanced by the ___.

The friction that exists between the surface of two bodies in contact when one body is sliding over the other, is called ___.

Limiting force of static friction does NOT depend on

In case of coefficient of static friction ($\mu _s$ ), kinetic friction ($\mu _k$ ) and rolling friction ($\mu _r$ ), which of the following relation is true

A body of weight 50 N is placed on a smooth surface. If the force required to move the body on the surface is 30 N, the coefficient of friction is

A wooden block of 50 kg is at rest on the table. A force of 70 N is required to just slide the block. The coefficient of static friction is

When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is:

A steel wire having a radius of 2.0 mm, carrying a load of 4 kg, is hanging from a ceiling. Given that g = $3.1 \ \pi \ ms^{-2}$ , What will be the tensile stress that would be developed in the wire ?