Convex
Concave
Both A & B
Cant be determined
Recently developed technique for monitoring foetal growth is
Recoil of gun is an example of
Red is used as an emergency or danger signal as
Red light is used for signals as it has
Refraction of star light through the earth’s atmosphere causes
Refractive Index of glass with respect to water is
Refrigerators keep food unspoiled as
Relative humidity is expressed as
Remote-sensing device has an inbuilt source of
Richter scale is used for measuring
