- Mass of gas is 300 gm and its specific heat at constant volume is 750J/kg K. if gas is heated through 75°C at constant pressure of 105 N/m
^{2}, it expands by volume 0.08 × 106 cm^{3}. find C_{P}/C_{V}.- 1.4
- 1.374
- 1.474
- 1.5

- At what temperature, the rms speed of gas molecules I half the value at NTP?
- 68.25 K
- 273 K
- 345 K
- 0 K

- 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

- For hydrogen gas C
_{P}– C_{V}= a, and for oxygen gas C_{P}– C_{V}= b, so that relation between a and b given by- a = 16 b
- 16 a = b
- a = b
- a = 4 b

- A gas expands adiabatically at constant pressure such that its temperature T ∝ 1/. The value of C
_{P}/C_{V}of the gas is- 1.30
- 1.50
- 1.67
- 2.00

- A wall is hit elastically and normally by n balls per second, all the balls have the same mass m and are moving with the same velocity u. the force exerted by the balls on the wall is
- mnu
^{2} - 2 mnu
^{2} - 2 mnu

- mnu

The temperature at which the r.m.s. velocity of H_{2}becomes escape velocity from the earth is,- 10059 °C
- 10059 K
- 10332 °C
- 10332 K

The root mean square speed of hydrogen molecules at 300 K is 1930 m/s. then the root mean square speed of oxygen molecules at 900 K will be- 1930m/s
- 836 m/s
- 643 m/s
- m/s

- 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
- 10 mv

- .

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

- What is the true for 3 moles of a gas?
- 3 (C
_{P}– C_{V}) = R - C
_{P}– C_{V}= R - C
_{P}– 3C_{V}= R

- 3 (C
- K.E. per unit volume is given by
- None of these

- The pressure exerted in terms of total kinetic energy per unit volume (E) is
- 3/2 E
- E
- 2/3 E
- E

- 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

- 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

- 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

- PV/3 = RT, V represents volume of
- Any amount of gas
- 2 moles of gas
- 3 moles of gas
- 4 moles of gas

- 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

- If 2 kcal, of heat is supplied to a system cause to change the internal energy of a gas is 5030J, and external work done is 3350 J, then what is mechanical equivalent of heat?
- 41.90 J/kcal
- 4190 J/cal
- 4.19 J/kcal
- 4.19 J/cal

- The average kinetic energy of the molecules of a gas at 27°C is 9 ×
^{10}–20 J. what is its average K.E. at 227°C?- 5 × 10–
^{20}J - 10 × 10–
^{20}J - 15 × 10–
^{20}J - 20 × 10–
^{20}J

- 5 × 10–

For a gas, the r.m.s. speed at 800K is- Half the value at 200 K
- Same as at 200 K
- Double the value at 200 K
- Four times the value at 200 K

- The internal energy of one mole of an ideal gas depend upon
- Volume of gas
- Temperature of gas
- Nature of gas
- Density of gas

- The root mean square speed of hydrogen molecules at 300K is 1930 m/s. then the root mean square speed of oxygen molecule at 900K will be
- 1930m/s
- 838 m/s
- 643 m/s

- Which of the statement is true
- R = (γ – 1) C
_{V} - R = (γ + 1) C
_{V} - C
_{V}= R(γ + 1)

- R = (γ – 1) C
- If at same temperature and pressure, the densities for two diatomic gases are respectively d1 and d2, then the ratio of velocities of sound in these will be
- d1d2