4. The transfer of heat by molecular collision is known as-
ব্যাখ্যা: When a fluid, such as air or liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection.
ব্যাখ্যা: Independent Power Producers (IPP) are private entities which own and or operate facilities to generate electricity and then sell it to a utility, central government buyer and end users.