Tag: heat energy

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Questions Related to heat energy

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

When you heat the water in a pot, it boils. What do you infer from above observation?

  1. Heat is a form of energy

  2. Water can boil itself

  3. Water develops heat on its own

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

Boiling of water requires energy. Therefore heat is a form of energy since it makes the water particles to move and do work.

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

Heat, as a form of energy, flows from

  1. a body of higher heat content to that of a lower heat content

  2. a body of lower heat content to that of a higher heat content

  3. a hot body to a cold body

  4. a cold body to a hot body
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heat flows from a hot body to a cold body. Heat flow has nothing to do with the total heat content of the body.

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

Amount of heat energy present is determined by :

  1. Sum total of kinetic energy and the potential energy of its molecules

  2. Sum total of mechanical energy and surface energy of its molecules

  3. Sum total of chemical energy and potential energy of its molecules

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

The amount of heat energy present in a body is determined by the sum total of the kinetic energy and potential energy of its molecules.

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

Heat is a from of ______

  1. Energy

  2. Work

  3. Power

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

In thermodynamics, heat is a type of energy transfer in which energy flows from a warmer substance or object to a colder one. It can be defined as the total amount of transferred energy excluding any macroscopic work that was done and any transfer of part of the object itself Transfer of energy as heat can occur through direct contact, through a barrier that is impermeable to matter (as in conduction), by radiation between separated bodies, by way of an intermediate fluid (as in convective circulation), or by a combination of these By contrast to work, heat involves the stochastic (random) motion of particles (such as atoms or molecules) that is equally distributed among all degrees of freedom, while work is confined to one or more specific degrees of freedom such as those of the center of mass.

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

When heat energy is given out by a hot substance then the kinetic energy of its molecules _________. Fill in the blank. 

  1. Increases

  2. Decreases

  3. Remain same

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

When heat energy is given out by a hot substance, the internal energy of the substance decreases hence kinetic energy of its molecules i.e. they become slower in motion.

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

Which of the following is false for heat?

  1. It is a form of energy.

  2. It cannot be seen but only can be felt.

  3. If a body's temperature is increased, it gains heat energy.

  4. It is always produced from chemical energy.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heat is a form of energy. It can only be felt and not seen. 

Heat transferred to a body is given by
$Q=ms\Delta T$
Hence, when temperature of body is increased, it gains heat energy. It flows from hotter body to colder body. Other forms of energy can also convert to heat energy. For example, for a sliding block on a rough surface, most of the kinetic energy is converted into heat energy.

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

At the molecular level what can be said about Heat energy?

  1. Heat energy is equal to total mechanical energy of all its molecules

  2. Heat energy is equal to total potential energy of all its molecules

  3. Heat energy is equal to total kinetic energy of all its molecules

  4. Heat energy is equal to total heat energy of all its molecules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At molecular level, heat energy is equal to mechanical energy of all molecules. Mechanical energy of the molecules is the sum of total Kinetic energy and potential energy of molecules.