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Choose the correct statement for processes $A$ & $B$ shown in figure.

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Important Questions on Thermodynamics

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

The Volume

(V)

of a monoatomic gas varies with its temperature

(T)

, as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state

A

to state

B

, is

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

A sample of

0.1 g

of water at

100^{o} C

and normal pressure

(1.013 \times 10^{5} N m^{- 2})

requires

54 cal

of heat energy to convert to steam at

100^{o} C

. If the volume of the steam produced is

167.1 cc,

the change in internal energy of the sample, is

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

Half mole of an ideal monoatomic gas is heated at a constant pressure of

1 atm

from

20 ° C

90 ° C

. Work done by the gas is

(

Gas constant,

R = 8.21 J {mol}^{- 1} K^{- 1}

)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

For the given cyclic process $C A B$ as shown for a gas, the work done is:

Question Image

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

One mole of an ideal monatomic gas is compressed isothermally in a rigid vessel to double its pressure at room temperature,

27^{o} C

. The magnitude of work done on the gas will be:

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

For a diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantities?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

2 kg

of a monoatomic gas is at a pressure of

4 \times 10^{4} N m^{- 2}

. The density of the gas is

8 kg m^{- 3}

. What is the order of energy of the gas due to its thermal motion?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

One mole of an ideal diatomic gas undergoes a transition from $A$ to $B$ along a path $AB$ as shown in the figure,

Question Image

The change in internal energy of the gas during the transition is:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

The molar specific heat of an ideal gas at constant pressure and constant volume is

C_{p}

and

C_{υ}

respectively. If

R

is the universal gas constant and the ratio of

C_{p}

C_{υ}

γ

then

C_{υ} =

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume

u = \frac{U}{V} \propto T^{4}

and pressure

p = \frac{1}{3} (\frac{U}{V})

. If the shell now undergoes an adiabatic expansion the relation between T and R is:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

An ideal gas is compressed to half of its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

Graph of specific heat at constant volume for a monatomic gas is

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

4.0 g

of a gas occupies

22.4

liters at NTP. The specific heat capacity of the gas at constant volume is

5.0 J K^{- 1} m o l^{- 1}

. If the speed of sound in this gas at NTP is

952 m s^{- 1}

, then the heat capacity at constant pressure is

(Take gas constant

R = 8.3 J K^{- 1} m o l^{- 1}

)

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

An ideal monoatomic gas occupies a volume of

2 m^{3}

at a pressure of

3 \times 10^{6} Pa .

The energy of the gas is:

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiabatic. The temperatures at A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement :

Question Image

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

The heat capacity of one mole an ideal is found to be

C_{V} = \frac{3 R (1 + a R T)}{2}

where

a

is constant. The equation obeyed by this gas during a reversible adiabatic expansion is:

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

An ideal gas is taken reversibly around the cycle $a - b - c - d - a$ as shown on the T (temperature) - S (entropy) diagram

Question Image

The most appropriate representation of above cycle on a U (internal energy)-V (volume) diagram is

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

Two moles of an ideal gas are allowed to expand from a volume of

10 {dm}^{3}

2 m^{3}

300 K

against a pressure of

101 .325 KPa .

Calculate the work done.

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Thermodynamic Processes and Indicator Diagrams

The molar specific heats of an ideal gas at constant pressure and volume are denoted by

C_{P}

and

C_{V}

, respectively. If

γ = \frac{C_{P}}{C_{V}}

and

R

is the universal gas constant, the

C_{V}

is equal to

Choose the correct statement for processes A & B shown in figure.

Important Questions on Thermodynamics

Learn and Prepare for any exam you want !

Choose the correct statement for processes $A$ & $B$ shown in figure.