The heat from burning of wood in a room spreads to corner of the room. Identify the process (es) by which heat is transferred.?

Option 1 : Convection and Radiation

The correct answer is Convection and Radiation.

Concept: 

Conduction

• The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.  In solids, generally, the heat is transferred by the process of conduction
• For example, The heat from the metal handle utensils when put on the gas stove and heated. 

Convection

• When water is heated the water near the flame gets hot. Hot water rises up. The cold water from the sides moves down towards the source of heat. This water also gets hot and rises and water from the sides move down. This process continues till the whole water gets heated. This mode of heat transfer is known as convection.

Radiation

• In solids, generally, the heat is transferred by conduction.
• In liquids and gases the heat is transferred by convection. No medium is required for transfer of heat by radiation.
• From the sun the heat comes to us by another process known as radiation.
• The transfer of heat by radiation does not require any medium. It can take place whether a medium is present or not. 
• When we sit in front of a room heater, we get heat by this process.
• A hot utensil kept away from the flame cools down as it transfers heat to the surroundings by radiation.

Explanation:

Here, The heat from the burning of wood in a room spreads to corner of the room, the methods of spreading heat in the room is through -

• Radiation - Heat is transferred on the other side of the room through radiation (without touching)
• Convection - The air near the burning wood is heated and goes above while the nearby cold air comes in and the cycle continues. This is a way of convection method of heating in the room.

So the correct answer is Convection and Radiation.