For the following questions answer them individually
The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining, is known as
The moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter is 6 cm, about centroidal axis is
If $$l$$ is the span of a light suspension bridge whose each cable carries total weight $$(\omega)$$ and the central dip is $$y$$, the horizontal pull at each support, is
A load of 500 kg waslifted through a distance of 13 cm by an effort of 25 kg which moved through a distance of 650 cm. The mechanical advantage of the lifting machine is