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

When we push a huge rock, there is no transfer of muscular energy to the stationary rock.  

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

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.

It is a form of energy which causes in us the sensation of hotness or coldness for ex. If we dip our finger in hot water we have sensation of hotness.

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.

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.

Greater heat energy of a body means molecules of the body are moving faster i.e. they have greater kinetic energy, which gives the higher temperature to the body i.e. body is hotter.

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

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.

Heat is a thermal energy that is transferred from hotter body to a cooler body.

Heat energy is termed as total energy contained within a substance.

Given,

Given:

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.

The velocity of sound is directly proportional to the square root of absolute temperature.
The formula for velocity of sound in a gas is
$v = \sqrt {\dfrac {\gamma p}{\rho}}$
According to standard gas equation
$pV = RT$
or $p = \dfrac {RT}{V}$
$\therefore v = \sqrt {\dfrac {\gamma RT}{\rho \times V}} = \sqrt {\dfrac {\gamma RT}{M}}$
where $\rho \times V = M$, the molecular weight of the gas
$\therefore v\propto \sqrt {T}$
Hence, the sound of the gun fired at the starting point will reach the finishing point quicker in summer than in winter. The lapse of time due to the time taken by the sound in reaching the finish point will be less in summer and, hence the time recorded will be more accurate in summer than in winter.

The correct answer is option(C).

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