Physics · Science General

Heat Transfer Mechanisms

877 Questions

Heat Transfer Mechanisms deal with the movement of thermal energy through conduction, convection, and radiation. It involves practical applications like ocean heat storage and atmospheric heating. These fundamental physics concepts are frequently asked in general science sections.

Thermal conductionHeat convectionThermal radiationSpecific heatStates of matter

Heat Transfer Mechanisms Questions

Multiple choice

Foam is

  1. Thermal insulator

  2. Thermal conductor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Foam is a poor conductor of heat because it contains trapped air pockets, making it an effective thermal insulator.

Multiple choice

Thermal insulators

  1. Transfer heat

  2. Don't transfer heat

  3. Transfer water

  4. Don't transfer water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Thermal insulators are materials that resist the flow of heat energy, meaning they do not transfer heat well.

Multiple choice

Thermal Conductors....

  1. transfer water

  2. Don't transfer water

  3. Transfer heat

  4. Dont transfer heat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thermal conductors allow heat to flow through them easily due to their molecular structure. Metals are excellent conductors because free electrons transfer heat energy rapidly.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

Conduction of heat is possible:

  1. when the bodies are apart from each other

  2. when the bodies have same temperature and in thermal contact

  3. when they have different temperatures maintaining distance between them

  4. bodies should be in contact and should have different temperatures
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Conduction is only possible when the bodies in contact have a temperature difference.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

More energetic molecules of a body transfer some of their energy to other molecules, without any change in their position in:

  1. conduction

  2. convection

  3. radiation

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Conduction is defined as the process of transferring heat from molecule to molecule, without the actual movement of molecules.

Here, more energetic molecules of a body transfer some of their energy to other molecules, without any change in their position.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

The thermal conductivity of the plate depends upon

  1. the temperature difference between the two sides

  2. the thickness of the plate

  3. the area of the plate

  4. nature of the material
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thermal conductivity of any object depends solely on the material of the object.
It is an intrinsic property and is independent on dimensions/mass/etc of the body.
For example, all iron rods will have same thermal conductivity.
All copper rods will have same thermal conductivity.
But, thermal conductivity of iron rod will be different from that of copper rod.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

Conduction is:

  1. the process of transfer of heat which does not require any material medium

  2. the process of transferring heat from molecule to molecule, without the actual movement of molecules

  3. the process in which molecules conduct heat by moving from hotter regions to colder regions

  4. the process in which heat energy moves through the medium of protons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conduction is defined as the process of transferring heat from molecule to molecule, without the actual movement of molecules.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

Conduction is ,

  1. the process of transfer of heat which does not require any material medium

  2. the process of transferring heat from molecule to molecule, with out any movement of molecules

  3. the process in which molecules conduct heat by moving from hotter regions to colder regions

  4. the process in which heat energy moves through the medium of protons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conduction is the process by which heat or electricity is directly transmitted through the material of a substance without movement of the material.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

It is warmer to have two thin blankets than to have single thick blanket because:

  1. Thick blankets cannot give more warmth

  2. Two blankets allow more heat to pass through them

  3. Air between the two blankets is a good conductor of heat

  4. Air between the thin blankets does not allow heat to pass through it since it is a bad conductor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air is bad conductor of heat, so it does not allow the heat to pass through, while the single thick blanket is a better conductor of heat so it is less effective.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

In which mode of transfer of heat molecules pass on heat energy to neighbouring molecules without actually moving from their positions?

  1. convection

  2. radiation

  3. conduction

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Conduction is the mode of heat transfer of heat molecules pass on heat energy to neighbouring molecules without actually moving from their positions.
Conduction is the transfer of heat from one substance to another by direct contact without mixing of masses.
Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

Transmission of heat by the movement of heated particles is called

  1. Conduction

  2. Convection

  3. Radiation

  4. Regelation

  5. Expansion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Convection is a mode of heat transfer where in the molecules near the heat source get heated up, they expand , becomes less dense , and rise upwards .whereas the relatively colder sink to the bottom and eventually get heated up. Thus transmission of heat by the movement of heated particles of heat particles is called convection.

Multiple choice physics temperature and heat modes of heat transfer - conduction conduction heat and modes of heat transfer

Using a heating blanket to get warm is an example of-

  1. Conduction

  2. Convection

  3. Radiation

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Using a heating blanket to get warm is example of conduction.
As conduction is the transfer of heat from one body to another by direct contact without mixing of masses. When we cover ourselves with blanket, there is direct contact. And blanket insulates the heat present in the body and does not out heat to escape and loose warmth.