Physics The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as Ultrasonics Audible sounds Infrasonics Megasonics Ultrasonics Audible sounds Infrasonics Megasonics ANSWER DOWNLOAD EXAMIANS APP
Physics In mirrors the back surface is coated with a thin layer of : Red oxide Silver Mercury Silver nitrate Red oxide Silver Mercury Silver nitrate 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 Reflection Total internal reflection Refraction Diffraction Reflection Total internal reflection Refraction 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 becomes very hard It has a high latent heat of fusion It reflects most of the heat from the sun It has a low specific heat capacity It becomes very hard It has a high latent heat of fusion It reflects most of the heat from the sun It has a low specific heat capacity ANSWER DOWNLOAD EXAMIANS APP
Physics Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly Reflect back the heat given by earth Absorb heat from the atmosphere send it towards earth Produce heat and radiate it toward earth Prevent cold waves from the sky descending on earth Reflect back the heat given by earth Absorb heat from the atmosphere send it towards earth Produce heat and radiate it toward earth Prevent cold waves from the sky descending on earth ANSWER DOWNLOAD EXAMIANS APP
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