Question

A thermal flask made of stainless steel contains several leads shots. If the flask is quickly shaken, up and down several times, the temperature of lead shots
A. Increase by adiabatic process
B. Increase by isothermal process
C. Decrease by adiabatic process
D. Remains same

Answer 1

This is a simple question aimed at testing your understanding of basic concept .In and adiabatic process, there is no heat transfer to or from the system. The system in the question is the lead shots contained in the thermos flask which is thermally insulated from outside. The temperature of the lead shots is therefore increased by adiabatic process.

Complete step by step answer:
We have leads with thermos as the system and outer environment is surrounding.
If we shake the steel bottle means we will work on the system.
So according to first equation of heat transfer:
$dq = du + dw$
And if we have not given any heat to system then given heat will be equal to 0
Mathematically $dq = 0$
So, $du = - dw$
Let ${T_1}$ be the temperature of the system.
And ${T_2}$ is the temperature of the surrounding
If we will work on the system then its internal energy will increases in form of heat
This only happens in the case of adiabatic processes.
So,
$du > 0 \\\ {T_2} - {T_1} > 0 \\\$

So we can say that the temperature of leads increases by the process of adiabatic .
In adiabatic processes there is no transfer of heat from system to surrounding and surrounding to system.
This is only a case of adiabatic process.

Note: Adiabatic process: An adiabatic process is one in which pressure, volume and temperature of the system change but there is no exchange of heat between the system and surrounding a system is an object where all the process of heat is observed by the observer. Everything other than the system is known as surrounding .