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NEET - Physics Kinetic Theory of Gases Practice Q & A Page: 2
26125.A unit mass of solid converted to liquid at its melting point. Heat is required for this process is
Specific heat
Latent heat of vaporization
Latent heat of fusion
External latent heat
26126.Two specific heats of a perfect gas are related by
CP – CV = $\dfrac{R}{J}$
CP – CV = J
CP – CV = RJ
$\dfrac{C_P + 1}{C_V}$ = 2.4 cal
26127.A gas expands adiabatically at constant pressure such that its temperature T α $\dfrac{1}{\sqrt{v}}$, the value of $\dfrac{C_P}{C_V}$ of the gas is
1.30
1.50
1.67
2.00
26128.At what temperature, the rms speed of gas molecules I half the value at NTP?
68.25 K
273 K
345 K
0 K
26129.The specific heat of a gas in isothermal process is
Zero
Negative
Remains constant
Infinite
26130.The r.m.s. speed of the molecules of a gas in a vessel is 200 m/s. if 25% of the gas leaks out of the vessel, at constant temperature, then the r.m.s. speed of the remaining molecules will be
400 m/s
150 m/s
100 m/s
200 m/s
26131.For hydrogen gas CP – CV = a, and for oxygen gas CP – CV = b, so that relation between a and b given by
a = 16 b
16 a = b
a = b
a = 4 b
26132.Which of the statement is true
R = (γ – 1) CV
R = (γ + 1) CV
CV = R(γ + 1)
CP = $\dfrac{R}{(\gamma - 1)}$
26133.Average kinetic energy of molecules is
Directly proportional to square root of temperature
Directly proportional to absolute temperature
Independent of absolute temperature
Inversely proportional to absolute temperature
26134.The difference between the principal specific heats of nitrogen is 300 J/kg-K and ratio of the two specific heats is 1.4 then
CP = 1050 J/kg-K
CP = 750 J/kg-K
CP = 650 J/kg-K
CP = 150 J/kg-K
26135.Energy supplied to convert unit mass of substance from solid to liquid state at its melting point is called
Latent heat of fusion
Evaporation
Solidification
Latent heat of fission
26136.The temperature at which the r.m.s. velocity of H2 becomes escape velocity from the earth is,
10059 °C
10059 K
10332 °C
10332 K
26137.A molecule of mass m moving with a velocity v makes 5 elastic collisions with a wall of the container per second. The change in its momentum per second will be
mv
5 mv
$\dfrac{\text{mv}}{10}$
10 mv
26138.The temperature of a gas is –68°C. to what temperature should it be heated, so that the r.m.s. velocity of the molecules be doubled?
357°C
457°C
547°C
820°C
26139.Following gases are kept at the same temperature. Which gas possesses maximum r.m.s. speed?
Oxygen
Nitrogen
Hydrogen
Carbon dioxide
26140.Speed of 3 molecules of a gas are 3 m/s, 4 m/s and 5 m/s. R.m.s. speed of these molecule is,
4.8 m/s
4.08 m/s
4.5 m/s
4 m/s
26141.What is the true for 3 moles of a gas?
3(CP – CV) = R
$\dfrac{C_P - C_V}{3}$ = R
CP – CV = R
CP – 3CV = R
26142.The pressure exerted in terms of total kinetic energy per unit volume (E) is
3/2 E
E
2/3 E
$\sqrt{3}$ E
26143.At what temperature, the r.m.s. speed of the molecules of a gas is half its value at NTP?
0 K
273 K
150 K
68.25 K
26144.Calculate the RMS velocity of molecules of a gas of which the ratio of two specific heats is 1.42 and velocity of sound in the gas is 500 m/s
727 m/s
527 m/s
927 m/s
750 m/s
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