Asked/Added Questions From NCERT:

Shruti Srivastva
No, a kitchen cannot be cooled by leaving the door of the refrigerator open.

-Answered by Shruti Srivastva On 08 October 2020:06:04:12 PM

Shruti Srivastva
No.

-Answered by Shruti Srivastva On 08 October 2020:06:02:50 PM

Shruti Srivastva
No.

-Answered by Shruti Srivastva On 08 October 2020:06:01:26 PM

Shruti Srivastva
For the operation of a heat engine we require a sink at temperature lower than the source and of sufficiently high thermal capacity, which is not possible in the sea. 

-Answered by Shruti Srivastva On 08 October 2020:05:41:51 PM

Anjali Kumari

 For converting heat energy into work continuosly, a part of heat energy absorbed from the source has to be rejected. The heat energy can be rejected only if there is a body, whose temperature is less than that of the source. This body at lower temperature is the sink.

-Answered by Anjali Kumari On 09 October 2020:06:59:06 PM

Anjali Kumari

 Heat and work are two different ways of transferring energy from one system to another. The the distinction between Heat and Work is important in the field of thermodynamics. Heat is the transfer of thermal energy between systems, while work is the transfer of mechanical energy between two systems.

-Answered by Anjali Kumari On 09 October 2020:06:49:55 PM

Shruti Srivastva
By heating or cooling.  

-Answered by Shruti Srivastva On 08 October 2020:05:38:36 PM

Anjali Kumari

 When liquid is converted into steam at its boling point, the temperature of liquid remains constant. i.e., change in temperature ΔT=0. Hence the specific heat, s=ΔQmΔT=ΔQm×0=∞

-Answered by Anjali Kumari On 09 October 2020:07:01:01 PM

Anjali Kumari

 The specific heat of a gas in an adiabatic process is zero but it is infinite in an isothermal process

-Answered by Anjali Kumari On 09 October 2020:06:52:17 PM

Anjali Kumari
The specific heat capacity of an ideal gas for isothermal process is infinity.

-Answered by Anjali Kumari On 09 October 2020:07:02:09 PM

Anjali Kumari
specific heat at constant pressure is more than the specific heat at constant volume because the gas can expand in the first case, causing more absorption of heat as compared to other one.

-Answered by Anjali Kumari On 09 October 2020:07:04:21 PM

Anjali Kumari
Gas has two specific heat capacities because it has two variables pressure and volume sensitive. ... If volume of the gas is constant and heat is supplied. Then we define specific heat is called specific heat at constant volume (C_V). Similarly at constant pressure specific heat capacity is defined as (C_P).

-Answered by Anjali Kumari On 09 October 2020:07:07:26 PM

Anjali Kumari

 The specific heats of gases are given as Cp and Cv at constant pressure and constant volume respectively while solids and liquids are having only single value for specific heat.

-Answered by Anjali Kumari On 09 October 2020:07:09:22 PM

Shruti Srivastva
Yes. 

-Answered by Shruti Srivastva On 08 October 2020:05:31:12 PM

Shruti Srivastva
The area gives the work done in a cyclic process.

-Answered by Shruti Srivastva On 08 October 2020:05:29:49 PM

Shruti Srivastva
No.

-Answered by Shruti Srivastva On 08 October 2020:05:26:11 PM

Shruti Srivastva
Yes.

-Answered by Shruti Srivastva On 08 October 2020:04:12:56 PM

Shruti Srivastva
Water molecule.

-Answered by Shruti Srivastva On 08 October 2020:04:10:40 PM

Anjali Kumari
During driving, temperature of air inside increases while its volume remains constant. According to Charle's law, at constant volume V,P∝T. Therefore, pressure of air inside the tyre increases.

-Answered by Anjali Kumari On 09 October 2020:07:10:59 PM

Shruti Srivastva
No.

-Answered by Shruti Srivastva On 08 October 2020:04:08:10 PM

Shruti Srivastva
Yes.

-Answered by Shruti Srivastva On 08 October 2020:04:07:08 PM

Shruti Srivastva
Yes.

-Answered by Shruti Srivastva On 07 October 2020:06:07:22 PM

Anjali Kumari
Yes, for example in an adiabatic compression, temperature rises and in an adiabatic expansion, temperature falls, although no heat is given or taken from the system in the repective changes.

-Answered by Anjali Kumari On 09 October 2020:07:12:05 PM

Shruti Srivastva
Sudden compression of a gas is an adiabatic process. The work done in compressing the gas increaces the internal energy of the gas. Hence the temperature of the gas rises.

-Answered by Shruti Srivastva On 07 October 2020:06:03:10 PM

Shruti Srivastva
During its expansion the gas does work against high pressure. This decreaces the internal energy and hence the temperature of the gas.

-Answered by Shruti Srivastva On 07 October 2020:06:00:36 PM

Shruti Srivastva
It will remain same.

-Answered by Shruti Srivastva On 07 October 2020:05:59:28 PM

nisha sheikh
Temperature of gases changes only when internal energy of the gases changes. Temperature of the gas is related to du by du = nCvΔT. Hence for all those infinite possible values of du, you will have infinite possible temperatures, still maintaining constant net heat of the system . i.e dq as zero.

-Answered by nisha sheikh On 21 October 2020:06:50:47 PM

Anjali Kumari
Heat supplied to a system is always equal to increase in its internal energy only if there is no external work is done by the system.. So delta V is zero and what you get is no work

-Answered by Anjali Kumari On 09 October 2020:07:15:54 PM

Shruti Srivastva
The internal energy of an ideal gas depemds only on the temperature of the gas, while that of a real gas depends on the temperature and volume, which in turns is dependent on pressure.

-Answered by Shruti Srivastva On 07 October 2020:05:53:20 PM

Shruti Srivastva
The internal energy of an ideal gas consists of only the kinetic energy of the particles. But for real gases it consists of both the kinetic as well as potential energies.

-Answered by Shruti Srivastva On 07 October 2020:05:50:59 PM

Anjali Kumari

he first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic processes, distinguishing two kinds of transfer of energy, as heat and as thermodynamic work, and relating them to a function of a body's state, called Internal energy.

The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.

For a thermodynamic process without transfer of matter, the first law is often formulated^{[1][nb 1]}

${\displaystyle \Delta U=Q-W}$,

-Answered by Anjali Kumari On 09 October 2020:07:13:18 PM

Shruti Srivastva
Any process in which the system returns to its initial state after undergoing a series of changes is known as a cylic process.

-Answered by Shruti Srivastva On 07 October 2020:05:48:05 PM