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 conduction in metals and non-metals thermal energy transfers physics

Pick the odd one out. Give scientifc reason for your answer:

  1. Conduction, convection, fusion, radiation.

  2. Iron, aluminimum, asbestos, copper

  3. Felt, paper, silver, wood

  4. Ventilation, land breeze, sea breeze, thermos flask
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Conduction, convection and radiation are the mode of heat transfer whereas fusion is the nuclear reaction.

So, option A is correct.

Multiple choice conduction in metals and non-metals thermal energy transfers physics

On a cold morning, a metal surface in touching is felt colder than a wooden surface, because the metal has:

  1. low thermal condutivity

  2. high thermal conductivity

  3. high specific heat

  4. low specific heat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metal appears cool on touching because heat flows from body (at higher temperature) to iron (at lower temperature). This can happen only when metal conducts heat. Wooden surface does not feel cool as it is non-conductor of heat.

Multiple choice conduction in metals and non-metals thermal energy transfers physics

On a cold morning, a metal surface will feel colder to touch than a wooden surface, because:

  1. metal has high specific heat

  2. metal has high thermal conductivity

  3. metal has low specific heat

  4. metal has low thermal conductivity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The metal has high thermal conductivity, i.e., they conduct heat faster. and also metal is a good conductor of heat. Hence, it takes away your body heat as you touch it and which makes your body temperature to drop, therefore you feel the coldness when you touch a piece of metal.

Multiple choice conduction in metals and non-metals thermal energy transfers physics

Statement-1
On a chilly day, the metallic cap of a pen feels much colder than the plastic body although both are at the same (room) temperature.
Statement-2
Metal has a higher coefficient of thermal conductivity than plastic.

  1. Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement- 1

  2. Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement-1

  3. Statement-1 is true, Statement-2 is false.

  4. Statement-1 is false, Statement-2 is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On the chilly day the room temperature is lower than our body temperature.Since metal is better conductor than plastic when we touch the metal cap and the plastic body of a pen,heat from our finger will flow more to the metal body as compare to plastic body. Hence option (A) is correct.

Multiple choice physics heat energy transfers heat energy heat, internal energy and work internal energy

When you heat the water in a pot, it boils. What do you infer from above observation?

  1. Heat is a form of energy

  2. Water can boil itself

  3. Water develops heat on its own

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Boiling of water requires energy. Therefore heat is a form of energy since it makes the water particles to move and do work.

Multiple choice physics heat energy transfers heat energy heat, internal energy and work internal energy

Heat, as a form of energy, flows from

  1. a body of higher heat content to that of a lower heat content

  2. a body of lower heat content to that of a higher heat content

  3. a hot body to a cold body

  4. a cold body to a hot body
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heat flows from a hot body to a cold body. Heat flow has nothing to do with the total heat content of the body.

Multiple choice physics heat energy transfers heat energy heat, internal energy and work internal energy

Heat is a from of ______

  1. Energy

  2. Work

  3. Power

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

In thermodynamics, heat is a type of energy transfer in which energy flows from a warmer substance or object to a colder one. It can be defined as the total amount of transferred energy excluding any macroscopic work that was done and any transfer of part of the object itself Transfer of energy as heat can occur through direct contact, through a barrier that is impermeable to matter (as in conduction), by radiation between separated bodies, by way of an intermediate fluid (as in convective circulation), or by a combination of these By contrast to work, heat involves the stochastic (random) motion of particles (such as atoms or molecules) that is equally distributed among all degrees of freedom, while work is confined to one or more specific degrees of freedom such as those of the center of mass.

Multiple choice physics heat energy transfers heat energy heat, internal energy and work internal energy

Which of the following is false for heat?

  1. It is a form of energy.

  2. It cannot be seen but only can be felt.

  3. If a body's temperature is increased, it gains heat energy.

  4. It is always produced from chemical energy.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heat is a form of energy. It can only be felt and not seen. 

Heat transferred to a body is given by
$Q=ms\Delta T$
Hence, when temperature of body is increased, it gains heat energy. It flows from hotter body to colder body. Other forms of energy can also convert to heat energy. For example, for a sliding block on a rough surface, most of the kinetic energy is converted into heat energy.

Multiple choice physics heat energy transfers heat energy heat, internal energy and work internal energy

Select the option which describes the best definition of heat in the context of thermal energy?

  1. energy possessed by a system due to movement of particles within the system

  2. the measure of thermal energy

  3. thermal energy transferred from one object to another

  4. energy possessed by an object due to the temperature of the object

  5. potential energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heat is a thermal energy that is transferred from hotter body to a cooler body.