I  It wets glass

II It needs to be coloured

III It has a low density

Water is not suitable for use as a thermometric liquid because

The power of a convex lens of focal length 20cm is 

The charge of magnitude 1.6 x 10 \(^{-19}\)C is placed in a uniform electric field of intensity 1200Vm\(^{-1}\). Calculate its acceleration, if the mass of the charge is 9.1 x 10\(^{-31}\)kg

Calculate the power of an object which moves through a distance of 500cm in 1s on a frictionless surface by a horizontal force of 50N

The defect of the eye lens which occurs when the ciliary muscles are weak is