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 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.

Multiple choice modelling collisions collisions momentum work, energy and power physics

Choose the incorrect statement

  1. Physical contact is not necessary for a collision

  2. Heat is a form of energy that resided in a system

  3. Kinetic energy of a system may increases due to collision

  4. Work done by internal forces may not be zero
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heat is energy in transit due to a temperature difference; it is not a property of the system (it does not 'reside' in a system). Internal energy resides in a system.

Multiple choice botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

Water has high specific heat due to

  1. Its dipole nature

  2. Smaller angle between hydrogen atoms and oxygen atom

  3. Hydrogen bonds amongst molecules

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

Water has high specific heat due to hydrogen bonds amongst molecules. Due to high specific heat, water minimizes changes in temperature. Hydrogen bonds are broken when it absorbs heat. Similarly, hydrogen bonds are formed when water releases energy in the form of temperature. This decreases the temperature of water.

Thus, the correct answer is option C.

Multiple choice physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

Solar cooker is painted black from inside so that:

  1. Less heat is lost

  2. Less heat is radiated

  3. More heat is amplified

  4. More heat is trapped
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Black surfaces are good absorbers and good radiators of heat and hence painting the surface black traps more heat and improves the efficiency of solar cooker.

Multiple choice physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

State whether true or false :
Water flows in a solar water heater due to the pressure difference between two ends of copper tube.

  1. True

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

Water always flow due to pressure difference generated by heat in solar cooker.

True.

Multiple choice physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

State whether true or false :
In order to increase the area absorbing heat energy, coil shaped copper tube is used. 

  1. True

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

The box contains copper tubes  bent in the form of a coil (zig-zag shape). This is done to increase the surface area  for absorbing heat.

Multiple choice physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

In order to absorb more heat, the outer surface of copper tube of solar water heater is coloured with :

  1. Red

  2. Yellow

  3. Black

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

Among all colour black is the best absorber for heat  so outer surface of copper tube is coloured with black.

Multiple choice physics solar equipment production of electricity from solar energy solar power alternate sources of energy solar power plant solar energy and its applications renewable and non-renewable resources renewable and non-renewable sources of energy generation of electricity

Two identical immersion heaters are to be used to heat water, in a large container. Which one of the following arrangement would heat the water faster :
Give reasons for your answer.

  1. Connecting the heaters in series with the main supply,

  2. Connecting the heaters in parallel with the main supply,

  3. Connecting the heaters in series and parallel with the main supply,

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

The water  molecule absorb energy from surroundings, this energy is called as  ______________.

  1. Molecular energy

  2. Latent energy

  3. Heat energy

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

B.  Latent Energy

 Latent heat is the energy absorbed by or released from a substance during a phase change from a gas to a liquid or a solid or vice versa.  If a substance is changing from a solid to a liquid, for example, the substance needs to absorb energy from the surrounding environment in order to spread out the molecules into a larger, more fluid volume.  If the substance is changing from something with lower density, like a gas, to a phase with higher density like a liquid, the substance gives off energy as the molecules come closer together and lose energy from motion and vibration.