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 heat energy transfers heat energy heat, internal energy and work internal energy

Define the term heat :

  1. the condition or quality of being hot

  2. the sensation of warmth or hotness

  3. the degree of hotness; temperature

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

Heat is the transfer of kinetic energy from one medium or object to another. Such energy transfer can occur in three ways: radiation, conduction, and convection.

Also, it can be defined as the quality of being hot, high temperature, and degree of hotness and temperature.

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

According to law of conservation of energy, heat energy is transformed into which two types of energy?

  1. Kinetic and potential energy

  2. Mechanical and potential energy

  3. Kinetic and thermal energy

  4. Nuclear and potential energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to law of conservation of energy, heat energy is transformed into Kinetic and potential energy

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

A metal ball which is passing through metal ring will not pass after :

  1. heating

  2. freezing

  3. constant conditions

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

All metals have a property of expansion when heated. Since the metal ball is heated, it will expand and will not pass the ring now.


Thus heating is the correct answer.

Hence the option A is correct.

Multiple choice physics types of energy law of conservation of energy the law of conservation of energy work, energy and machines

The temperature of water at the bottom of a large waterfall is higher than that of the water at the top, because

  1. the falling water absorbs heat from the sun.

  2. the KE of the falling water is converted into heat.

  3. the water at the bottom has greater PE.

  4. rocks on the bed of the river give out heat.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As the water falls, the Kinetic Energy of the water gets converted to heat energy increasing its temperature at the bottom than at the top.

Multiple choice physics heat - measurement sources of heat introduction to heat measuring temperature

Heat energy produces a sensation of-

  1. warmth

  2. coldness

  3. both warmth and coldness

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.
Heat energy produces a sensation of warmth
Multiple choice physics heat - measurement sources of heat introduction to heat measuring temperature

Heat will flow from

  1. Hot body to cold body

  2. Cold body to hot body

  3. two bodies at the same temperature

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

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient. If there is a temperature difference in a system, heat will always move from higher to lower temperatures.Heat will flow from Hot body to cold body

Multiple choice physics heat - measurement sources of heat introduction to heat measuring temperature

A thermostat is?

  1. A device used to maintain a constant temperature of a water bath or an oven

  2. A modern type of thermoflask which work on the principle of equipartition of heat energy

  3. An instrument by which the accuracy of thermometers is determined

  4. A device which varies the temperature of a both
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A thermostat is a device that automatically regulates temperature, or that activates a device when the temperature reaches a certain point.

Thus, it can be used to maintain a constant temperature of a water bath or an oven.
Hence, option A is correct.

Multiple choice physics world energy needs renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

The superheated steam is raised in geothermal plants by the heat of :

  1. magma

  2. lava

  3. either (a) or (b)

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

Answer is C.

The heat from the earth's core continuously flows outward. It transfers (conducts) to the surrounding layer of rock, the mantle. When temperatures and pressures become high enough, some mantle rock melts, becoming magma. Then, because it is lighter (less dense) than the surrounding rock, the magma rises, moving slowly up toward the earth's crust, carrying the heat from below.
Sometimes the hot magma reaches all the way to the surface, where we know it as lava. But most often the magma remains below earth's crust, heating nearby rock and water (rainwater that has seeped deep into the earth) - sometimes as hot as 700 degrees F. Some of this hot geothermal water travels back up through faults and cracks and reaches the earth's surface as hot springs or geysers, but most of it stays deep underground, trapped in cracks and porous rock. This natural collection of hot water is called a geothermal reservoir.
Hence, the super-heated steam is raised in geothermal plants by the heat of magma or lava.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

A piece of glass is heated to a high temperature and then allowed to cool. If it cracks, a probable reason for this is the following property of glass :

  1. Low thermal conductivity

  2. High thermal conductivity

  3. High specific heat

  4. High melting point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In case of low thermal conductivity, the heat is not distributed properly. When it is heated, the temperature at its outer  surface increases more than in the inner part. This means expansion on the outer part will be more than the inner part. So a stress will be generated. If the body is cooled again, the outer surface will contract more rapidly, then the inner part. This stress will generate crack in the body.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Select the correct option given below:
There is a hole in the middle of a copper plate . When heating the plate,diameter of hole would be

  1. always increase

  2. always decrease

  3. remains the same

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

A metal expand on heating. If a hole is made in the metal plate, the hole will also expand due to the expansion of the material. It can be explained by considering the air in the region of hole and that air will also expand on heating. Therefore, diameter of the hole increases always.

Multiple choice bio-chemistry caskets of life animal cells vs plant cells comparing plant and animal cells comparison between animal and plant cell

The interior of a cow-dung pile kept for a few days is quite warm. This is mostly because: 

  1. Cellulose present in the dung is a good insulator.

  2. Bacterial metabolism inside the dung releases heat.

  3. Undigested material releases heat due to oxidation by air.

  4. Dung is dark and absorbs a lot of heat.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At the later stages of decomposition of cowdung, mesophilic micro-organisms decompose the dung, generating heat from exothermic( process which produces heat) processes; such heat generation is associated with the well known phenomenon of the elevated temperature of composting.