The Pressley index is the ratio between

The woven fabric air permeability is expressed in

The breaking load of a 200 denier multifilament yarn containing 130 filaments found to be 800 gram force. Its tensile strength in gram force/denier is

When the electrical field parallel to the fibre axis, the refractive index will be

Which one of the following equation is used to calculate the work factor ?

If a fibre obeyed Hooke's law, the load-elongation curve would be a