Mechanical Prop...

Assertion : The bridges are declared unsafe after a long use.
Reason : Elastic strength of bridges decrease with

Assertion : Young's modulus for a perfectly plastic body is zero.
Reason : For a perfectly plastic body is zero.

Assertion : Identical spring of steel and copper are equally stretched more will be done on the steel spring.
Reason : Steel is more elastic than copper.

Which is the dimensional formula for modulus of rigidity ?

When more than 20 kg mass is tied to the end of wire it breaks what is maximum mass that can be tied to the end of a wire of same material with half the radius ?

A beaker of radius 15 cm is filled with liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface ofliquid is

A thin liquid film formed between a u-shaped wire and a light slider supports a weight of 1.5 × 10^–2 N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is.

Radius of a soap bubble is 'r', surface tension of soap solution is T. Then without increasing the temperature how much energy will be needed to double its radius.

Two small drops mercury, each of radius R, coalesce the form a single large drop. The ratio of the total surface energies before and after the change is.