Thermodynamics practice · Medium

When water is converted into ice, its entropy

An ideal gas in a piston cylinder arrangement is to be taken from a temperature of $500 {~K}$ to a temperature of $600 {~K}$. Which of the thermodynamic process given in options should be used so that the final state of $600 {~K}$ is achieved using a minimum energy input from outside?

A mono atomic gas is supplied the heat$Q$ very slowly keeping the pressure constant. The work done by the gas will be

Statement-I: Monoatomic, diatomic and polyatomic gases are adiabatically compressed such that compression ratio is $\left(\frac{P_2}{P_1}\right)$. Then monoatomic gas will have maximum final volume out of these three gases.
Statement-II: Monoatomic gas has least degree of freedom.

252 micro coulombs of charge is transferred between two points having a potential difference of 109 volt during an electric discharge. What mass of ice $\left( {at\,\mathrm{ }{0^0}C} \right)$ would it melt if all the energy released could be used for the above purpose? (take mechanical equivalent of heat as 4.2 joule/calorie and latent heat of fusion of ice is 80 cal/gm)

(A): Air in a cylinder is suddenly compressed by a piston. If the volume after compression is half the original volume the final pressure is twice the initial pressure.
(R): Suddenly compressed process is isobaric process.

An engine operating between the boiling and freezing points of water will have
A. Efficiency more than $27 \%$
B. Efficiency less than the efficiency of a Carnot engine operating between the same two temperatures.
C. Efficiency equal to $27\%.$
D. Efficiency less than $27\%.$
Choose the correct answer from the options given below

First law of thermodynamics is given by

Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of

Which of the following can not determine the state of a thermodynamic system

Air is expanded form 50 litre to 150 litre at 2 atmospheric pressure (1 atm pressure = $\mathbf{1}{\mathbf{0}^\mathbf{5}}\mathbf{kg}\mathrm{ }{\mathbf{m}^{ - \mathbf{2}}}$). The external work done is

Which of the following law of thermodynamics forms the basis for the definition of temperature?

A diatomic gas $\left( {\gamma \mathrm{ } = \mathrm{ }1.4} \right)$ does 60 J of work when it is expanded isobarically. The heat given to gas in the process is

In supplying 400 calories of heat to a system, the work done will be

How much heat (in joules) is required to raise the temperature of $1 \mathrm{~g}$ of water from $14.5^{\circ} \mathrm{C}$ to $15.5^{\circ} \mathrm{C}$ at 1 atmospheric pressure?

A lead bullet of 10 g travelling at $300\,m/s$ strikes against a block of wood and comes to rest. Assuming $50\%$ of heat is absorbed by the bullet, the increase in its temperature is (specific heat of lead $= 150J/kg,K)$

Latent heat of 1gm of steam is 536 cal/gm, then its value in joule/kg is

Statement-1: The quantity of heat in a solid body determines its temperature.
Statement-2: Whenever heat is supplied to a solid body which is not undergoing phase change the temperature of the solid body increases.

Assertion: ${P}$ versus $\frac{1}{{V}}$ graph is straight line for adiabatic process
Reason: $PV =$ constant for adiabatic process.

A Carnot engine working between the temperature 500 K and 1000 K does a work of 1000 J. The heat energy supplied by the source to the engine per cycle is

Which of the following the scalar quantity is

In an isothermal change of an ideal gas, $\Delta U = 0$. The change in heat energy $\Delta Q$ is equal to

Assertion: first law of thermodynamics allows many processes which actually don't happen.
Reason: First law of thermodynamics must not be violated for any process to happen.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Efficiency of a reversible heat engine will be highest at $- 273^\circ C$ temperature of cold reservoir.

Reason R: The efficiency of Carnot’s engine depends not only on temperature of cold reservoir but it depends on the temperature of hot reservoir too and is given as $\eta = \left( {1 - \frac{{{T_2}}}{{{T_1}}}} \right)$.
In the light of the above statements, choose the correct answer from the options given below

The thermodynamic process in which no work is done on or by the gas is

If amount of heat given to a system be 50 J and work done on the system be 15 J, then change in internal energy of the system is

The theory of refrigerator is based on

In which thermodynamic process, volume remains same?

First law of thermodynamics states that

In thermodynamics, heat and work are: