Physics Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to: The heating effect of current alone Intense sunlight at noon Both the heating effect of current and hysteresis loss Hysteresis loss alone The heating effect of current alone Intense sunlight at noon Both the heating effect of current and hysteresis loss Hysteresis loss alone ANSWER DOWNLOAD EXAMIANS APP
Physics When hot liquid is poured into a thick glass tumbler, it cracks because glass : Is a bad conductor of heat so only inner surface expands Has low temperature coefficient of expansion Has a very low specific heat Has high temperature coefficient of expansion Is a bad conductor of heat so only inner surface expands Has low temperature coefficient of expansion Has a very low specific heat Has high temperature coefficient of expansion ANSWER DOWNLOAD EXAMIANS APP
Physics Propagation of sound can be visualised as propagation of ________ variations in the medium Viscosity Density Elasticity Porosity Viscosity Density Elasticity Porosity ANSWER DOWNLOAD EXAMIANS APP
Physics Bubbles of air rise up through liquids due to Air current over the liquid and buoyancy Surface tension and adherence Up thrust and surface tension Viscosity and buoyancy Air current over the liquid and buoyancy Surface tension and adherence Up thrust and surface tension Viscosity and buoyancy ANSWER DOWNLOAD EXAMIANS APP
Physics A gradual increase in loudness is known as Timbre Crescendo Fortissimo None of these Timbre Crescendo Fortissimo None of these ANSWER DOWNLOAD EXAMIANS APP
Physics Which among the following waves is used for communication by artificial satellites ? M. Radio waves Micro waves Frequency of 1016 series M. Radio waves Micro waves Frequency of 1016 series ANSWER DOWNLOAD EXAMIANS APP
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