Thermodynamics practice · Medium

An electric immersion heater of 1.08 kW is immersed in water. After the water has reached a temperature of ${100^0}C$, how much time will be required to produce 100 g of steam

During an adiabatic expansion, the increase in volume is associated with which of the following possibilities $w\mathrm{.r}\mathrm{.t}\mathrm{.}$ pressure and temperature 

When heat in given to a gas in an isobaric process, then

First law of thermodynamics states that

When heat is given to a gas in an isothermal change, the result will be

In a reversible isochoric change

A certain amount of heat energy is supplied to a mono atomic ideal gas which expands at constant pressure. What fraction of heat energy is converted into work.

Assertion: First law of thermodynamics does not forbid flow of heat from lower temperature to higher temperature.
Reason: Heat supplied to a system is not equal to the increase in its internal energy.

The temperature of 5 moles of a gas at constant volume is changed from 100$^ \circ C$ to 120$^ \circ C$. The change in internal energy is 80 J. the total heat capacity of the gas at constant volume will be in $\mathrm{J}{\mathrm{K}^{ - 1}}$ is

Assertion(A): Molar heat capacity cannot be defined for isothermal process.

Reason(R): In isothermal process, $p-V$ versus $T$ graph is a dot.

(A): The Carnot cycle is useful to understanding the performance of heat engines.
(R): The Carnot cycle provides a ways of determining the maximum possible efficiency achievable with reservoirs of given temperatures.

A sample of 1 mole gas at temperature $\mathrm{T}$ is adiabatically expanded to double its volume. If adiabatic constant for the gas is $\gamma=\frac{3}{2}$, then the work done by the gas in the process is:

Value of two principle specific heats of a gas in cal ${\left( {\mathrm{mol K}} \right)^{ - 1}}$ determined bt different students are given. Which is most reliable?

Earth receives $1400 \mathrm{~W} \mathrm{~m}^{-2}$ of solar power. If all the solar energy falling on a lens of area $0.2 \, \mathrm{m}^{-2}$ is focused on to a block of ice of mass $280 \, \mathrm{g},$ then what is the time (in min) taken by the ice to melt completely? $[\mathrm{L}_{\text {fusion}}=3.3 \times 105 \mathrm{~J} \mathrm{~kg}^{-1}]$

The coefficient of performance of a refrigerator work between ${10^ \circ }C$and ${20^ \circ }C$ is

First law of thermodynamics is given by

The amount of heat required to convert 10 g of ice at $- {10^ \circ }C$ into steam at 100$^ \circ C$ is (in calories)

During adiabatic expansion of 10 moles of a gas, the internal energy decreases by 50 J. Work done during the process is

The radio of the slopes of $p - V$ graphs of adiabatic and isothermal is

If a cylinder containing a gas at high pressure explodes, the gas undergoes

At $0^{\circ} \mathrm{C}$ and normal atmospheric pressure, the volume of $1 \mathrm{~g}$ of water increases from $1 \mathrm{~cm}^3$ to $1.091 \mathrm{~cm}^3$ on freezing. What will be the change in its internal energy? Normal atmospheric pressure is $1.013 \times 10^5 \mathrm{~Nm}^{-2}$ and latent heat of melting of ice $=80 \mathrm{~cal} \mathrm{~g}^{-1}$.

In changing the state of thermodynamics from $A$ to $B$ state, the heat required is $Q$ and the work done by the system is W . The change in its internal energy is

Two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other.

A monoatomic gas of $n$-moles is heated from temperature ${T_1}$ to ${T_2}$under two different conditions (i) at constant volume and (ii) at constant pressure. The change in internal energy of the gas is

Internal energy of an ideal gas does not depend upon:

Which of the following statements is correct for any thermodynamic system?

Assertion: We can not change the temperature of a body without giving (or taking) heat to (or from) it.
Reason: According to principle of conservation of energy, total energy of a system should remain conserved.

What is the temperature of source in Carnot cycle of 10% efficiency when heat exhausts at 270 K?

Two cylinders of equal capacity are connected to each other via stop cock. $A$ contains an ideal gas at a standard temperature and pressure, $B$ is completely evacuated. The entire system is thermally insulated. The stop cock suddenly opens. Which one is correct option?

Assertion(A): In isothermal process, whole of the heat energy supplied to the body is converted into internal energy.

Reason(R): According to the first law of thermodynamics,

$\Delta Q=\Delta U+\Delta W$