Transmission Of Light Short Question With Answer: General Science Cadet College Test
Q.No.01: What is thermal energy?
Ans: Thermal energy is the energy made by moving particles in matter.
Q.No.02: What is the difference between heat and thermal energy?
Ans: Thermal energy moves from one object to another.
Heat moves from a hot object to a cooler object.
Heat moves from a hot object to a cooler object.
Q.No.03: What is transmission of energy?
Ans: It is the transfer of heat from one object to another.
Q.No.04: What is conduction?
Ans: Conduction is the transfer of heat through a material without moving the particles.
Q.No.05: What is the difference between good and bad conductors?
Ans: Good conductors let heat pass easily (e.g., iron, silver).
Bad conductors do not let heat pass easily (e.g., glass, cork).
Bad conductors do not let heat pass easily (e.g., glass, cork).
Q.No.06: Why are metals good conductors of heat?
Ans: Because metal particles are close together and have free electrons that help move heat quickly.
Q.No.07: How are birds an example of heat?
Ans: Birds have feathers that stop heat from escaping, keeping them warm.
Q.No.08: What is convection?
Ans: Convection is when particles move to the heat source, take in heat, and move away with it.
Q.No.09: What is radiation in heat transfer?
Ans: Radiation is the transfer of heat through empty space without needing particles or a medium.
Q.No.10: Give an example of heat transfer by radiation.
Ans: The Sun warming your face on a clear day is heat transfer by radiation.
Q.No.11: What is thermal insulator?
Ans: A thermal insulator is a material that slows down or stops the flow of heat.
Q.No.12: Name two everyday uses of thermal insulators.
Ans: Jackets keep people warm, and thermos flasks keep drinks hot or cold.
Q.No.13: What happens to particles when they are heated?
Ans: They move faster and spread apart.
Q.No.14: Why does hot air rise?
Ans: Hot air is lighter because its particles are farther apart, so it rises above cooler, heavier air.
Q.No.15: What is an example of convection in nature?
Ans: Sea breezes, where warm air from the land rises and cooler air from the sea moves in.
Q.No.16: Why does metal feel colder than wood at the same temperature?
Ans: Metal conducts heat away from your hand faster than wood, making it feel colder.
Q.No.17: What is the unit of heat energy?
Ans: The joule (J) is the unit of heat energy.
Q.No.18: How do double-glazed windows save energy?
Ans: They trap air between glass layers, reducing heat loss by conduction and convection.
