1.
Heat cannot be produced by doing work.
2.
No gaps are left between the rails of railway tracks.
3.
Poor conductors of heat are also good insulators of heat.
4.
Ventilators, when provided in rooms, are located near their roofs
5.
A material medium is required for transfer of heat by the proces
of radiation.
state true or false
Answers
false
true
false
true
false
Answer:
1. False When energy is exchanged between thermodynamic systems by thermal interaction, the transfer of energy is called heat. ... Heat and work are related: work can be completely converted into heat, but the reverse is not true: heat cannot be completely converted to work
2. True The gaps left between successive rails on a railway track, the reason is that the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left, the expansion in summer will cause the rails to bend sideways. That will result in train accidents.
3. False If something doesn't have the ability to conduct, it's given that they have an insulating ability. Hence, poor conductors of heat are consequently termed to be good insulators of heat.
4. True Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom.
5. False Transfer of heat by radiation does not need any material medium. Energy from the sun comes to us by radiation. 1. Heat transfer through conduction is a slow process.