If the pressure on an enclosed gas is doubled and its temperature rises from 27ºC to 127ºC, then its volume will 

The simple form of the lead acid accumulator often has a negative pole of 

A monochromatic light is one that 

Bifocal lens is used to correct the eye defect of 

A force of 10N extends a spring of natural length 1m by 0.02m, calculate the length of the spring when the applied force is 40N.