Physics · Science General

Heat Transfer Mechanisms

828 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 heat - measurement introduction to temperature application of various thermometric scales different types of thermometers

A physicist says "a body contains $10\ joule$ heat" but a physics learner says "this statement is correct only when the body is in liquid state". Mark correct option or options :

  1. physicist statement is correct

  2. physics learner's statement is correct

  3. both statements are correct

  4. both statements are wrong
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heat is a form of energy in transit between systems due to a temperature difference; it is not a state function or a property contained within a body. Therefore, saying a body 'contains' heat is physically incorrect regardless of its state.

Multiple choice geography temperature process of heat transfer in the atmosphere temperature and insolation sun: the ultimate source

When both incoming and outgoing radiation are balanced, it is called _________. 

  1. heat summation

  2. heat balance

  3. heat budget

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

Sun is the main source of energy for earth. The earth 's surface receives solar energy in form of short-wave solar radiation where it is converted into heat by the process of absorption. The earth sends the same amount of energy back to space in the form of long-wave terrestrial radiation. This balance between the amount of insolation received from the sun and the outgoing terrestrial radiation is known as the earth's heat budget.

Multiple choice geography temperature process of heat transfer in the atmosphere temperature and insolation sun: the ultimate source

The atmosphere warms up by the process of _______.

  1. radiation

  2. conduction

  3. convection

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atmosphere warms up by the following processes:

1.  Radiation: It is the direct heating by the transmission of heat waves. The upper layer of atmosphere absorbs some amount of heat from the rays of the sun as they pass through the atmosphere.
2. Conduction: It is a process of transfer of heat by molecular activity. When two bodies with unequal temperature come into contact, there is a flow of energy from the warmer body to the cooler one. The lower layer of the atmosphere heated through the process of conduction.
3. Conversation: Transfer of heat of atmosphere from one place to another is known as conversation. Conversation is the main process in the heating of the atmosphere.

Multiple choice geography temperature process of heat transfer in the atmosphere temperature and insolation sun: the ultimate source

Which of the following term is used for transfer of heat through winds?

  1. Conduction

  2. Convection

  3. Advection

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

The term advection is used for horizontal transport of heat. Advection is responsible for slow heat transfer from the equatorial regions to the polar region. This process of heat transfer is relatively more important than any other method. The scorching winds blowing during the summer in the northern plains of India, which are known as Loo, are a typical example of advection.

Multiple choice geography temperature process of heat transfer in the atmosphere temperature and insolation sun: the ultimate source

The transfer of heat in the atmosphere by air currents is called ____________.

  1. conduction

  2. convection

  3. advection

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

Since the atmosphere is a gaseous medium, convection is the most significant mechanism of heat transfer. Heat gained by the layers of air at or near the earth's surface from radiation or conduction is usually transferred to the upper atmospheric layers by the process of convection. Thus convection is the transfer of heat in the atmosphere by the air current.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Drinking of hot tea from a saucer preferred to a cup, because:

  1. Surface area

  2. Material of the saucer

  3. Thermal conductivity

  4. Colour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The surface area of milk poured in a saucer is more than that in the cup. The more the surface area, the more is the rate of evaporation which causes cooling. Therefore, the tea present in saucer becomes cool faster than in a cup.


Hence, option A is correct.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

How does the perspiration leave cooling effect on our body?

  1. Sweat particles absorb energy from the surrounding to change into vapour thereby reducing the temperature

  2. The particles release energy into the atmosphere and the temperature decreases

  3. The particles absorb energy from the body and converts into vapour thereby increasing the temperature

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

When the ambient temperature is above body temperature, then radiation, conduction, and convection all transfer heat into the body rather than out. Since there must be a net outward heat transfer, the only mechanisms left under those conditions are the evaporation of perspiration from the skin and the evaporative cooling from exhaled moisture.

Multiple choice physics save energy types of sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy

Which of the following enters the super heater of a boiler ?

  1. Cold water

  2. Hot water

  3. Wet steam

  4. Super-heated steam
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Therefore, wet streams enters the super heater of a boiler. 

Multiple choice biology aids to health immunization, treatment and antibiotics antibodies and antitoxin prevention and treatment of disease

Strong heat and boiling also destroy germs and may be called .......... disinfectants.

  1. Physical

  2. Chemical

  3. Biological

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Disinfection is a process of sterilization (free from contamination). There are three types of disinfectant biological, chemical and physical. Heating, boiling and radiation comes under the physical disinfectant. Thus, the correct answer is option A.

Multiple choice geography environmental changes elements of weather and climate : temperature process of heat transfer in the atmosphere environmental regions (zones)

Which of the following is transmitted in long wave?

  1. solar radiation

  2. Heat radiation

  3. Both a and b

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

Solar radiation transmits longwave radiation.
Solar radiation is radiant energy emitted by the sun from a nuclear fusion reaction that creates electromagnetic energy. The spectrum of solar radiation is close to that of a black body with a temperature of about 5800 K. About half of the radiation is in the visible short-wave part of the electromagnetic spectrum.

Multiple choice evs weather, climate and adaptation of animals to different climates climate and weather weather, climate and adaptations of animals to climate atmosphere and its components

The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

  1. Conduction of heat upward from a hot surface

  2. Convection from a hot surface

  3. Absorption of infrared energy that has been radiated from the surface

  4. Heat energy from the earth's interior
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atmosphere is primarily heated from the surface upward via conduction, convection, and radiation. Heat from the Earth's interior (geothermal heat) is negligible compared to solar heating at the surface.

Multiple choice biology weather, climate and adaptation of animals to different climates climate and weather weather, climate and adaptations of animals to climate atmosphere and its components

Perspiration cools the body by

  1. Advective heat transfer

  2. Radiative heat transfer

  3. Conductive heat transfet

  4. Latent heat transfer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Perspiration cools the body because the phase change of water from liquid to vapor requires energy, which is absorbed from the skin as latent heat.