Convection
Trending Questions
Q. Statement 1: Cold air flows from sea to land in the daytime.
Statement 2: Air above the sea gets hot in the daytime and starts flowing towards the land.
Statement 2: Air above the sea gets hot in the daytime and starts flowing towards the land.
- Both statements are correct
- Statement 1 is correct but statement 2 is incorrect
- Both statements are incorrect
- Statement 2 is correct but statement 1 is incorrect
Q. Transfer of heat in liquids takes place predominantly by:
- Conduction
- Convection
- Radiation
- Both convection and radiation
Q. The mode of heat transfer in fluids is convection.
- True
- False
Q. Which of the following situations explains the meaning of free convection?
- Air conditioning installations in nuclear reactors
- Flow of water inside the condenser tubes
- Cooling of internal combustion engine
- Drying of clothes in the sun
Q. In which of the following type of convection, a fan or pump is used to increase the rate of heat transfer?
- Natural convection
- Forced convection
- Gravitational convection
- Adhesive action
Q. Rooms are fitted with ventilators to let the hot air out. What is the phenomenon involved here?
- Conduction
- Convection
- Radiation
- Insulation
Q. Which of the following statements is true about convection?
- Convection occurs only in cold liquids.
- In solids, heat is transferred only by convection.
- Convection requires a medium for transmission of heat.
- Heat flows from the cold end to the hot end in a substance.
Q. Convection occurs in solids.
- False
- True
Q. Hot air is less dense than cold air.
- True
- False
Q. In which of the following processes does heat transfer in the form of movement of particles?
- Convection
- Radiation
- Conduction
- All of the above.