Match the following? Column - I Column - II (a) Isothermal process (i) No heat exchange (b) Adiabatic process (ii) Constant temperature (c) Isochoric process (iii) Constant pressure (d) Isobaric process (iv) Constant volume

(a-ii), (b-iii), (c-i v), (d-i)

EASY

Earn 100

Which one of the following statements is true, in respect of the usual quantities represented by $∆ Q, ∆ U$ and $∆ W.$

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Important Questions on Thermodynamics

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

No work is done on the system, but

q

amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy

(ΔU)

of this system and what type of wall does the system have?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

A gas at state $A$ changes to state $B$ through path $I$ and $II$ shown in figure. The change in internal energy is $Δ U_{1}$ and $Δ U_{2}$ , respectively. Then

Question Image

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

A given quantity of gas is taken from the state $A$ to the state $C$ reversibly by two paths, $A \to C$ directly and $A \to B \to C$ as shown in the figure below:

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During the process $A \to C$ , work done by the gas is $100 J$ and heat absorbed is $120 J$ . If during the process $A \to B \to C$ , the work done by the gas is $80 J$ , the heat absorbed is

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

An insulated rectangular container carrying gas is filled with a movable piston. The dimension of the piston is

10 cm \times 20 cm \times 1 cm .

The density of the material of which the piston is made is

8 g {cm}^{- 3}

. If the gas expands, lifting the piston by,

10 cm,

what is the change in the internal energy of the gas?
[Take

g = 10 m s^{- 2}

]

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

Figure below shows two paths that may be taken by a gas to go from a state A to a state C.
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In process AB,

400 J

of heat is added to the system and in process BC,

100 J

of heat is added to the system. The heat absorbed by the system in the process AC will be:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

A gas mixture contains monoatomic and diatomic molecules of

2

moles each. The mixture has a total internal energy of (symbols have usual meanings)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

In thermodynamics, heat and work are :

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

An ideal monoatomic gas of volume

V

is adiabatically expanded to a volume

3 V

27 ° C .

The final temperature in Kelvins is
(use

\frac{C_{P}}{C_{V}} = \frac{5}{3}

)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

When a system is taken from state $i$ to state $f$ along the path $i a f$ , it is found that $Q = 50 cal$ and $W = 20 cal$ . Along the path $i b f$ , $Q' = 36 cal$ . $W$ along the path $i b f$ is,

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EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

The first law of thermodynamics confirms the law of _____

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

An ideal gas is taken from state- $1$ to state- $2$ through optional path $A, B, C$ and $D$ as shown in the $P - V$ diagram. Let $Q, W$ and $U$ represent the heat supplied, work done and change internal energy respectively, then

Question Image

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

A monoatomic gas of mass

4.0 u

is kept in an insulated container. The container is moving with velocity

30 m s^{- 1}

. If the container is suddenly stopped then a change in temperature of the gas (

R =

gas constant) is

\frac{x}{3 R}

. Value of

x

is,

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

Which one of the graphs below best illustrates the relationship between internal energy

U

of an ideal gas and temperature

T

of the gas in

K

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

When

110 J

of heat is added to a gaseous system, its internal energy increases by

40 J .

What is the amount of work done?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

Assume that you have an ideal gas for which

γ = 1.50,

initially at

1.0

atm pressure. When the gas is compressed to half its original volume, then the final pressure, if the compression is isothermal, is __________

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

500 g

of water is heated from

30 ° C

90 ° C .

What is the change in its internal energy? (Specific heat of water is

4184 J {kg}^{- 1} K^{- 1}

)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

Match the following?

Column - I		Column - II
(a)	Isothermal process	(i)	No heat exchange
(b)	Adiabatic process	(ii)	Constant temperature
(c)	Isochoric process	(iii)	Constant pressure
(d)	Isobaric process	(iv)	Constant volume

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

Which of the following does not follow first law of thermodynamics?

(w =

work

; q =

heat

; ΔU =

change in internal energy

)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Heat, Internal Energy and Work

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>Heat, Internal Energy and Work

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?

Which one of the following statements is true, in respect of the usual quantities represented by ∆Q, ∆U and ∆W.

Important Questions on Thermodynamics

Learn and Prepare for any exam you want !

Which one of the following statements is true, in respect of the usual quantities represented by $∆ Q, ∆ U$ and $∆ W.$