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 physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

According to principle of calorimetry, heat absorbed by cold bodies is equal to heat released by hot bodies.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The statement is true, according to principle of calorimetry, heat absorbed by cold bodies is equal to heat released by hot bodies.
It can also be understood by conservation of energy concept.
Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

What is the principle of the method of a mixture? Name the law on which this principle is based.

  1. Newtons law of cooling

  2. none

  3. principle of calorimetry

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

A principle of calorimetry states that if there is no loss of heat in surrounding the total heat loss by hot body equals to total heat gained by a cold body.
i.e. heat loss = heat gained
It is based on Newton's Law of Cooling, which states that when a liquid is heated of higher temperature and placed to cool. Then the rate of heat lost by a temperature of the liquid is directly proportional to the difference in temperature of the surrounding.

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

When in thermal contact, the quantity of heat lost by the hotter body is ...... the amount of heat gained by the colder body. (neglect loss of heat due to convection & radiation)

  1. Equal to

  2. Greater than

  3. Less than

  4. Cannot say
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
When in thermal contact, the quantity of heat lost by the hotter body is equal to the amount of heat gained by the colder body. (neglect loss of heat due to convection & radiation)
This is the principle of calorimetry.
Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

The branch of physics that deals with the measurement of heat energy is known as

  1. Fermentation

  2. Latent heat

  3. Calorimetry

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

Calorimetry is the branch of physics which deals with the measurement of heat energy. Calorimetry is one of the methods for the determination of specific heats or latent heats of the substances.

Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

State True or False.


According to principle of calorimetry heat absorbed by cold bodies is equal to heat released by hot bodies.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
True
According to principle of calorimetry; heat absorbed by cold bodies is equal to heat released by hot bodies. Heat flows from a body at higher temperature to body at lower temperature. Heat will transfer till bodies come in thermal equilibrium that is, they reach at the same temperature. And heat released is equal to absorbed if no heat is dissipated to surrounding.
Multiple choice physics measurement and effects of heat heat exchange calorimeter measuring thermal quantities by the method of mixtures

If there are no heat losses to the surroundings, the quantity of heat gained by the cold body is equal to the quantity of heat lost by the hot body.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Yes, its true that if there are no heat losses to the surroundings, the quantity of heat gained by the cold body is equal to the quantity of heat lost by the hot body.
If there is no heat loss, as heat is a form of energy; by conservation of energy i.e. energy can neither be created nor destroyed but can be converted from one form to other or can be transferred from one body to other.
Multiple choice physics energy production perfectly black body black-body radiation black body radiation

An ideal black body is a :

  1. lump of charcoal heated to a high temperature

  2. metal coated with a black dye

  3. glass surface coated with coal tar

  4. hollow enclosure blackened inside and having a small hole
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hollow enclosure blackened inside and having a small hole is a very good example of a black body.
Suppose once light enters inside it.
It may be absorbed or it may be reflected.
Since it is blackened from inside, there is a high probability that it will be absorbed.
Now if it is reflected, it will suffer multiple reflections and it is very unlikely that it will come out of the hole because the aperture of hole is too small. Moreover, with each reflection, more and more fraction of it will be absorbed. So, it will serve as a good black body.

Multiple choice physics energy production perfectly black body black-body radiation black body radiation

An ideal black body at room temperature is thrown in a furnace. It is observed that

  1. initially it is darkest body and at later time the brightest

  2. it is darkest body at all the times

  3. it cannot be distinguished at all the times

  4. initially it is the darkest body and at later times it cannot be distinguished
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initially the black body is in bright environment. So, it appears dark and finally when its temperature becomes equal to temperature of furnace, it becomes invisible

Multiple choice

As a sample of matter is heated, its particles?

  1. stop moving

  2. move more slowly

  3. move more quickly

  4. are unaffected
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Temperature is a measure of the average kinetic energy of particles. As matter is heated, particles gain kinetic energy and move more quickly.

Multiple choice

energy of motion

  1. potential energy

  2. kinetic energy

  3. heat energy

  4. freezing
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Kinetic energy is defined as the energy an object possesses due to its motion. Potential energy is stored energy, and heat is energy transfer.