81) The wavelength of light is expressed in
Ans) Angstrom
82) The non-uniform distribution of light intensity due to the superposition of two waves is called
Ans) Interference
83) Colour T.V. Utilises primary colour
Ans) Red, blue and green
84) The soap bubbles in sunlight appear having brilliant colour due to
Ans) Interference of light.
85) The presbyopia affected person uses
Ans)Bifocal lens of suitable focal length
86) The reciprocal of the relative aperture is called
Ans) Focal ratio
87) The kerosene oil spread on the water surface appears in decent colours
Ans) Due to the interference of light
88) The seas appear blue due to
Ans) Scattering of light
89) A photoelectric cell converts
Ans) Light energy to electric energy
90) Conversion of heat into electrical energy is achieved by using ( General Science Objective Questions)
Ans) Thermocouple
