Download App

Laws of Thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsLaws of Thermodynamics3 Marks
Question
The final volume of a system is equal to the initial volume in a certain process. Is the work done by the system necessarily zero? Is it necessarily non-zero.
✓

Answer

Work done by the system is neither necessarily zero nor necessarily non-zero. If in a certain process, the pressure P stays constant, then,$\Delta\text{W}=\text{P}\Delta\text{V}$
$\Rightarrow\text{W}=\text{P}(\text{V}_2-\text{V}_1)$
As $\text{V}_2=\text{V}_1$$\Rightarrow\text{W}=0$
(Initial volume, $V_1$ = Final volume, $V_2$) Hence, it is an isobaric process. Even if P = P(V), net work done will be zero if $V_2= V_1$. In this case, work done is zero. If the system goes through a cyclic process, then initial volume gets equal to the final volume after one cycle. But work done by the gas is non-zero.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Laws of Thermodynamics→Laws of Thermodynamics — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A body of mass $12kg$ is suspended by a coil spring of natural length $50cm$ and force constant $2.0 \times 10Nm^3$. What is the stretched length of the spring? If the body is pulled down further stretching the spring to a length of $5.9cm$ and then released, what is the frequency of oscillation of the suspended mass?
(Neglect the mass of the spring.)
→
A raindrop of mass $1.00g$ falling from a height of $1km$ hits the ground with a speed of $50m s^{-1}$. Calculate:
  1. The loss of $P.E.$ of the drop.
  2. The gain in $K.E.$ of the drop.
  3. Is the gain in $K.E.$ equal to loss of $P.E.$? If not why.
Take $g = 10m s^{-2}$
→
One end of a rod of length 20cm is inserted in a furnace at 800K The sides of the rod are covered with an insulating material and the other end emits radiation like a blackbody. The temperature of this end is 750K in the steady state. The temperature of the surrounding air is 300K. Assuming radiation to be the only important mode of energy transfer between the surrounding and the open end of the rod, find the thermal conductivity of the rod. Stefan constant $\sigma=6.0\times10^{-8}\text{Wm}^{-2}\text{K}^{-4}.$
→
Show that it is not possible for a photon to be completely absorbed by a free electron.
→
Why is electrical power required at all when the elevator is descending? Why should there be a limit on the number of passengers in this case?
→
In a $p-n$ junction, a potential barrier of $250\ meV$ exists across the junction. A hole with a kinetic energy of $300\ meV$ approaches the junction. Find the kinetic energy of the hole when it crosses the junction if the hole approached the junction.
  1. From the $p-$side.
  2. From the $n-$side.
→
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is $\rho_\text{i}=0.917\text{g cm}^{-3}?$
→
A simple pendulum of length lm has a wooden bob of mass $1kg$. It is struck by a bullet of mass $10^{-2}kg$ moving with a speed of $2 \times 10^2m/ sec$. The bullet gets embedded into the bob. Obtain the height to which the bob rises before swinging back.
→
A body of mass 3kg makes an elastic collision with anthor body at rest and continues to move in the original direction with a speed equal to one-third of its original speed. Find the mass of the second body.
→
A big size balloon of mass M is held stationary in air with the help of a small block of mass M/2 tied to it by a light string such that both float in mid air. Describe the motion of the balloon and the block when the string is cut. Support your answer with calculations.
→