Physics The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as Ultrasonics Megasonics Infrasonics Audible sounds Ultrasonics Megasonics Infrasonics Audible sounds ANSWER DOWNLOAD EXAMIANS APP
Physics In mirrors the back surface is coated with a thin layer of : Silver Silver nitrate Red oxide Mercury Silver Silver nitrate Red oxide Mercury ANSWER DOWNLOAD EXAMIANS APP
Physics A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. Diffraction Refraction Total internal reflection Reflection Diffraction Refraction Total internal reflection Reflection ANSWER DOWNLOAD EXAMIANS APP
Physics The snow on the mountains does not melt all at once when it is heated by the sun because: It reflects most of the heat from the sun It has a low specific heat capacity It has a high latent heat of fusion It becomes very hard It reflects most of the heat from the sun It has a low specific heat capacity It has a high latent heat of fusion It becomes very hard ANSWER DOWNLOAD EXAMIANS APP
Physics Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly Produce heat and radiate it toward earth Reflect back the heat given by earth Prevent cold waves from the sky descending on earth Absorb heat from the atmosphere send it towards earth Produce heat and radiate it toward earth Reflect back the heat given by earth Prevent cold waves from the sky descending on earth Absorb heat from the atmosphere send it towards earth ANSWER DOWNLOAD EXAMIANS APP
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