11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil என்னுயிர் என்பேன் -துணைப்பாடம் - இசைத்தமிழர் இருவர் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil மொழி கலை -செய்யுள் - ஒவ்வொரு புல்லையும் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - இலக்கணம் - பகுபத உறுப்புகள் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - துணைப்பாடம் - வாடிவாசல் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A
Published on: 10/11/2020
11th Standard Physics Kinetic Theory of Gases English Medium Free Online Test One Mark Questions 2020 - 2021
Download Tamil Nadu 11th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
Two different ideal gases are enclosed in two different vessels at the same pressure. If \(\rho\)1 and \(\rho\)2 are their densities and v1 and v2 their rms speeds, respectively then - is equal to ________.
\(\frac { { \rho }_{ 1 }^{ 2 } }{ { \rho }_{ 2 }^{ 2 } } \\ \)
\(\frac { { \rho }_{ 2 }^{ 2 } }{ { \rho }_{ 1}^{ 2 } } \\ \)
\(\sqrt { \frac { { \rho }_{ 1 }^{ } }{ { \rho }_{ 2 }^{ } } }\)
\(\sqrt { \frac { { \rho }_{ 2 }^{ } }{ { \rho }_{ 1 }^{ } } }\)
2.
A real gas behaves as an ideal gas at _________.
low pressure and high temperature
high pressure and low temperature
low pressure and low temperature
high pressure and high temperature.
3.
Pressure exerted by a gas is _______.
independent of the density of the gas
inversely proportional to the density of the gas
directly proportional to the density of the gas
directly proportional to the square of the density of the gas
4.
A jar has mixture of hydrogen and Oxygen gases in the ratio 1: 5. The ratio of mean kinetic energies of hydrogen and Oxygen molecules is ________.
1: 5
5: 1
1: 1
1: 25
5.
A gas is enclosed in a container which is then placed on a fast moving train. The temperature of the gas ________.
rises
remains unchanged
falls
becomes unsteady
6.
At a given temperature which of the following gases possesses maximum rms velocity of molecules?
H2
O2
N2
CO2
7.
Two gases are enclosed in a container at constant temperature. One of the gases, which is diatomic, has relative molecular mass eight times the other, which is monoatomic. The ratio of the rms speed of the molecules of the monoatomic gas to that of the molecules of the diatomic gas is ________
8
4
2\(\sqrt2\)
2
8.
Pressure exerted by a perfect gas is equal to _____________.
mean K.E. per unit volume
half of mean K.E. per unit volume
one-third of mean K.E. per unit volume
two-third of mean K.E. per unit volume.
9.
Oxygen and hydrogen gases are at the same temperature the ratio of the average K.E of an oxygen molecule and that of a hydrogen molecule is _____________.
16
4
1
\(\frac{1}{4}\)
10.
The temperature is changed from 27°C to 327°C. Find ratio of K.E of molecules at two temperature ________________.
3:2
2:3
1:2
2:1
11.
The ratio of the vapour densities of two gases at a gn is 9 : 8. The ratio of the rms velocity of their molecules is ________________.
3: 2\(\sqrt{2}\)
2\(\sqrt{2}\):3
9:8
8:9
12.
During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature the ratio \(\frac { { C }_{ p } }{ { C }_{ v } } \)for the gas is _____________.
\(\frac{4}{3}\)
2
\(\frac{5}{3}\)
\(\frac{3}{2}\)
13.
If there are n no. of molecules per unit volume and m is the mass of each, Vx is the x - component of velocity pressure can be written as _______________.
P= nm\({ V }_{ x }^{ 2 }\)
P= 2nm\({ V }_{ x }^{ 2 }\)
P= m\({ V }_{ x }^{ 2 }\)
P= n\({ V }_{ x }^{ 2 }\)
14.
The perfect gas equation can be written as _________________.
PV = \(\mu\)RT
PV = \(\mu\)R
PV = RT
P = \(\mu\)RTV
15.
Which of the following gases will have least rms speed at a given temperature?
Hydrogen
Nitrogen
Oxygen
Carbon dioxide
16.
A sample of gas consists of \(\mu\)1 moles of monoatomic molecules, \(\mu\)2 moles of diatomic molecules and \(\mu\)3 moles of linear triatomic molecules. The gas is kept at high temperature. What is the total number of degrees of freedom?
[3\(\mu\)1 + 7( \(\mu\)2 + \(\mu\)3)] NA
[3\(\mu\)1 + 7\(\mu\)2 + 6\(\mu\)3] NA
[7\(\mu\)1 + 3( \(\mu\)2 + \(\mu\)3)] NA
[3\(\mu\)1 + 6( \(\mu\)2 + \(\mu\)3)] NA
17.
If the temperature and pressure of a gas is doubled the mean free path of the gas molecules
remains same
doubled
tripled
quadrapoled
18.
The ratio \(\gamma =\frac { { C }_{ p } }{ { C }_{ V } } \) for a gas mixture consisting of 8 g of helium and 16 g of oxygen is
23/15
15/23
27/11
17/27
19.
The average translational kinetic energy of gas molecules depends on
number of moles and T
only on T
P and T
P only
20.
An ideal gas is maintained at constant pressure. If the temperature of an ideal gas increases from 100K to 1000K then the rms speed of the gas molecules
increases by 5 times
increases by 10 times
remains same
increases by 7 times
1.
(d)
\(\sqrt { \frac { { \rho }_{ 2 }^{ } }{ { \rho }_{ 1 }^{ } } }\)
2.
(a)
low pressure and high temperature
3.
(c)
directly proportional to the density of the gas
4.
(c)
1: 1
5.
(c)
falls
6.
(a)
H2
7.
(c)
2\(\sqrt2\)
8.
(d)
two-third of mean K.E. per unit volume.
9.
(c)
1
10.
(c)
1:2
11.
(b)
2\(\sqrt{2}\):3
12.
(d)
\(\frac{3}{2}\)
13.
(a)
P= nm\({ V }_{ x }^{ 2 }\)
14.
(a)
PV = \(\mu\)RT
15.
Carbon dioxide
\(v_{r m s}=1.73 \sqrt{\frac{k T}{m}}\)
16.
For mono atomic molecule No of degrees of freedom = 3
For diatomic molecule of degrees of freedom = 5
For triatomic molecule No of degree of freedom = 7
\(\text { Total }=\left[3 x_{1}+7\left(\mu_{2}+\mu_{3}\right)\right] N_{A}\)
17.
Mean free path is independent of temperature and pressure
18.
\(\gamma=\frac{27}{17}\)
Number of moles of helium
\(\mathrm{n}=\frac{8}{4}=2\)
Number of moles of oxygen
\(n^{\prime}=\frac{16}{32}=\frac{1}{2}\)
For mono atomic Helium gas
\(\mathrm{f} =3 \)
\(\mathrm{C}_{\mathrm{V}} =\frac{f}{2} R \)
\(=\frac{3}{2} R \)
For diatomic oxygen gas
f = 5
\(\mathrm{C}_{\mathrm{V}} =\frac{f}{2} R \)
\(=\frac{5}{2} R \)
\(\mathrm{C}_{\mathrm{V}} \text { mixture } =\frac{n c_{v}+n^{\prime} C_{v}^{\prime}}{n+n^{\prime}} \)
\(=\frac{2 \times \frac{3}{2} R+\frac{1}{2} \times \frac{5}{2} R}{2+\frac{1}{2}} \)
\(C_{V} =\frac{3 R+\frac{5}{4} R}{\frac{5}{2}} \)
\(=\frac{17 R}{10} \)
\(\gamma =\frac{C_{p}}{C_{v}} \)
\(=1+\frac{R}{C_{V}} \)
\(=1+\frac{R}{\frac{17 R} {10}}\)
\(=1+\frac{10}{17} \)
\(=\frac{27}{17} \)
19.
Average K.E of each degree of freedom
\(=\frac{1}{2} k T=\frac{1}{2} N T[k=N]\)
N - no. of moles
T - temperature
20.
\(v_{m s}=1.73 \sqrt{\frac{k T}{m}}\)
\(\text { AT Increased by } 10 \text { times }\)
\(v_{\mathrm{ms}} \propto \Delta T\)
\(\text { RMS speed increases by } 10 \text { times. }\)
11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - உரைநடை - மலை இடப்பெயர்கள் : ஓர் ஆய்வு Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - துணைப்பாடம் - யானை டாக்டர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - செய்யுள் - ஐங்குறுநூறு Important Questions And Answers Study Material - QB365 Set A
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