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Theory For Notes Making

Objective Assignment

Subjective Assignment

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Theory For Notes Making

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Objective Assignment

1.

A Carnot engine is working between 127°C and 27°C. The increase in efficiency will be maximum when the temperature of

(a)      the source is increased  by 50°C

(b)      the sink is decreased by 50°C

(c)     source is increased by 25°C and that of sink is decreased by 25°C

(d)      both source and sink are decreased by 25°C each

Ans (b)

2.

Three moles of an ideal monoatomic gas undergoes the process ABCDA as shown, where TA = 300 {{T}_{A}}\ =\ 300K, TB = 600 {{T}_{B}}\ =\ 600K,  Tc = 1800 K {{T}_{c}}\ =\ 1800\ KandTD = 900 K {{T}_{D}}\ =\ 900\ K. Find the work done by the gas during the cycle.

(a) 17.8 kJ                                       

(b) 14.9 kJ

(c) 19.9 kJ                                       

(d) 21.1 kJ

Ans (b)

3.

A thermo dynamical system goes from state (i) P1, V {{P}_{1}},\,Vto 2P1, V 2{{P}_{1}},\,V (ii) P, V to P, 2V. Then work done in the two cases is

(a)   zero, zero                              

(b)   zero, PV

(c)    PV1 P{{V}_{1}}, zero     

(d)   PV1 P{{V}_{1}}, P1V1 {{P}_{1}}{{V}_{1}}

Ans(b)

4.

An ideal gas is taken through series of changes represented in fig. The net work done by the gas at the end of the cycle is equal to

(a) P1V1 {{P}_{1}}{{V}_{1}}    

(b) 3P1V1 3{{P}_{1}}{{V}_{1}}  

(c) 6P1V1 6{{P}_{1}}{{V}_{1}}  

(d) 12P1V1 12{{P}_{1}}{{V}_{1}}

Ans (d)

5.

Heat energy absorbed by a system in going through a cyclic process shown in figure is

(a)      107πJ {{10}^{7}}\pi J       

(b)      104πJ {{10}^{4}}\pi J

(c)       102πJ {{10}^{2}}\pi J       

(d)      10−3πJ {{10}^{{-3}}}\pi J

Ans (c)

6.

An ideal gas is taken through the cycle A→B→C→A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C→A is

(a)  –5 J    

(b)  –10 J

(c)  –15J   

(d) –20 J

Ans(a)

Subjective Assignment

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QUIZ

1
Created on By physicscart

Various Thermodynamics Cycles (Basic Level)

1 / 10

Boiling water is changing into stream. Under this condition, the specific heat of water is

2 / 10

A balloon is filled with hydrogen at a given pressure at 20ºC. What fraction of gas will escape out of the balloon if the temperature rises to 40ºC at constant pressure ?

3 / 10

It is required to double the pressure of a gas in a container at 27ºC by heating it. To what temperature the gas should be raised

4 / 10

If the volume of air at 0ºC and 10 atmospheric pressure is 10 litre, its volume, in litre, at normal temperature and pressure would

5 / 10

A vessel of volume 0.1 m^3  containing air at a pressure of 76 cm of Hg is connected to an evacuated vessel of capacity 0.09 m^3. What is the resultant air pressure if temperature is assumed to remain constant ?

6 / 10

We have a jar A filled with gas characterised by parameters P, V and T and another jar B filled with a gas with parameters 2P, V/4 and 2T, where the symbols have the usual meanings. The ratio of the number of molecules in jar A to those in jar B is

7 / 10

The volume of a vessel A is twice the volume of another vessel B, and both of them are filled with the same gas.

If the gas in A is at twice the temperature and twice the pressure in comparison to the gas in B, then the ratio of the gas molecules in A and B is

8 / 10

When the temperature of a gas is raised from 27ºC to 90ºC, the percentage increase in the r.m.s. velocity of the molecules will be

9 / 10

A mixture of helium and hydrogen gases is filled in a vessel at 30ºC. The r.m.s. velocities of helium and hydrogen molecules are in the ratio

10 / 10

A monoatomic gas (γ=5/3) (\gamma =5/3) is suddenly compressed to 18 \frac{1}{8} of its original volume adiabatically, then the pressure of the gas will change to

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