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 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 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
B Correct answer
Explanation

When immersion heaters are connected in parallel, each heater receives the full mains voltage, resulting in a higher total power output (P = V^2 / R) compared to a series connection where the voltage is divided. Higher power means water is heated faster.

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.

Multiple choice physics heat and energy causes of greenhouse effect global warming adaptation in animals

When we are near to ice, why do we feel cold?

  1. Because our body temperature is higher than the surrounding temerature

  2. Because there is ice near to us

  3. Because we wear warm cloth

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

When we are nearer to the ice, our body temperature is higher than the surrounding temperature. So heat flows from out body to the surrounding resulting in lowering the body temperature. Thus we feel cold when being nearer to the ice.

Multiple choice physics heat and energy causes of greenhouse effect global warming adaptation in animals

When we use blanket why do we feel warm?

  1. Because the blanket is warm

  2. Because the blanket doesn't allow air to enter

  3. Because our body is warm

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

Cold air tries to carry body heat away. Blankets form a barrier between the body and cold air. Hence heat doesn't transfer through the blankets as air will not flow through the blankets.

Multiple choice evs let's play with water law of constant proportion - i law of constant proportion law of definite proportions

The thermal resistance of heat transfer is low in:

  1. Drop wise condensation

  2. Filmwise condensation

  3. Bulk wise condensation

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

The thermal resistance of heat transfer is low in drop wise condensation.


 Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow.

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Choose the correct answers from the alternatives given .
Diffuse, disorganised forms of energy

  1. Are heat

  2. Increase entropy

  3. Are not usable to do work

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Entropy is the measurement of this disorder in energy, in which heat energy, is not usable, is considered disorganized. Thus, a system with a large amount of usable energy has low entropy, a system with little usable energy has high entropy. Based on the second law of thermodynamics, entropy will continually increase in the universe as energy becomes more and more disorganized.

So, the correct option is 'All of the above'. 

Multiple choice evs atmosphere- wind weather, climate and adaptation of animals to different climates climate and weather weather, climate and adaptations of animals to climate

Heat is energy in the process of being transferred from:

  1. Hot objects to cold objects

  2. Low pressure to high pressure

  3. Cold objects to hot objects

  4. High pressure to low pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heat is defined as the transfer of thermal energy between systems due to a temperature difference, always flowing from a region of higher temperature to a region of lower temperature.