26185.A room temperature the r.m.s. velocity of the molecules of a certain diatomic gas is found to be 1930 m/sec. the gas is
H2
F2
O2
Cl2
26186.Latent heat of ice is
Less than external latent heat of fusion
Equal to external latent heat of fusion
More then external latent heat of fusion
Twice the external latent heat of fusion
26187.The mean kinetic energy of one gram-mole of a perfect gas at absolute temperature T is
$\dfrac{1}{2}kT$
$\dfrac{1}{2}RT$
$\dfrac{3}{2}kT$
$\dfrac{3}{2}RT$
26188.If 3 kg of mass is converted into energy. Energy released by
9 × 108 J
9 × 1016 J
27 × 108 J
27 × 1016 J
26189.In a gas, 5 molecules have speed 150 m/s, 170 m/s, 170 m/s, 180 m/s, 190 m/s. ratio of Vrms to Vmean is nearly
1
3
0.5
0.04
26190.The mean free path of nitrogen molecules at 27°C is 3 × 10-7 m/s. if the average speed of nitrogen molecules at the same temperature is 600 m/s then the collision frequency will be
109 /sec
1.5 × 109 /sec
2 × 109 /sec
3 × 109 /sec
26191.CP and CV denote the molar specific heats of a gas at constant pressure and at constant volume respectively. If $\dfrac{\text{C}_P}{\text{C}_V} = \gamma$ and CP – CV = R, then CV is equal to
$\dfrac{\text{R}}{\gamma - 1}$
$\dfrac{\gamma - 1}{\text{R}}$
$\dfrac{\gamma \text{R}}{\gamma - 1}$
$\sqrt{\dfrac{\text{R}}{\gamma - 1}}$
26192.The volume of a gas 20°C is 100cm3 at normal pressure. If its is heated to 100°C, its volume becomes 125 cm3 at the same pressure, then volume coefficient of the gas is (At normal pressure)
0.0033/°C
0.0030/°C
0.0025/°C
0.0021/°C
26193.The kinetic energy of one gm-molecule of a gas at normal temperature and pressure is (R = 8.31 J/mol-K)
0.56 × 104 J
1.3 × 102 J
2.7 × 102 J
3.4 × 103 J