- The r.m.s. speed of the molecules of an enclosed gas is x. what will be the r.m.s. speed, if the pressure of the gas is doubled but the temperature is kept constant?
- x
- 2x

According to kinetic theory of gases, at absolute zero of temperature- Water freezes
- Liquid helium freezes
- Molecular motion stops
- Liquid hydrogen freezes

At 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- H
_{2} - F
_{2} - O
_{2} - Cl
_{2}

- H

The r.m.s velocity of the molecules of an ideal gas is C at a temperature of 100K. at what temperature is r.m.s. velocity will be doubted?- 200 K
- 400 K
- 300 K
- 50 K

One mole of mono atomic gas (γ = 5/3) is mixed with one mole of diatomic gas (γ = 7/5) what will be the value of γ for the mixture?- 1.5
- 2.5
- 1.0
- 2

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

- 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- 10
^{9}/sec - 1.5 × 10
^{9}/sec - 2 × 10
^{9}/sec - 3 × 10
^{9}/sec

- 10

The mean translational K.E. per unit volume E and the pressure P of a perfect gas are related as

If two gases of molecular weights M_{1}and M_{2}are at same pressure and temperature, ratio of their r.m.s. speed will be- M
_{2}: M_{1} - M
_{1}: M_{2}

- M

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

- The volume of a gas 20°C is 100cm
^{3}at normal pressure. If its is heated to 100°, 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

- 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

- The kinetic energy of one gm-molecule of a gas at normal temperature and pressure is (R = 8.31 J/mol-K)
- 0.56 × 10
^{4}J - 1.3 × 10
^{2}J - 2.7 × 10
^{2}J - 3.4 × 10
^{3}J

- 0.56 × 10
- 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

- The average translational K.E. of the molecules in a sample of oxygen at 300K is 6 × 10–20 J. what is the average translational energy at 750 K?
- 2 × 10–
^{19}J - 1.5 × 10–
^{19}J - 3 × 10–
^{18}J - 3.5 × 10–
^{21}J

- 2 × 10–

Translational kinetic energy of gas molecule, for one mole of the gas, is equal

Mean kinetic energy of perfect gas is- ∝ T
- ∝ T2

- The volume of 2.8 gm of carbon monoxide (CO) at 27°C and 0.821 atm pressure is (R = 0.0821 litre atm/mol K)
- 0.3 litre
- 1.5 litre
- 3 litre
- 60 litre

- The frequency of a light wave in a material is 3 × 10
^{14}Hz and the wavelength is 6000. What is the refractive index of the material?

The temperature of a gas is raised from 27°C to 927°C. the root mean square speed- times the earlier value
- Gets halved
- Remains the same
- Gets doubled

If 3 kg of mass is converted into energy. Energy released by- 9 × 10
^{8}J - 9 × 10
^{16}J - 27 × 10
^{8}J - 27 × 10
^{16}J

- 9 × 10
- Which of the following is the unit of specific heat?
- J kg/°C
- J/kg°C
- kg °C/J
- J kg/°C2

If CP – CV = R and , then which relation is correct.- .

Three containers of the same volume contains three different gases. The masses of the molecules are m_{1}, m_{2}and m_{3}and number of molecules in their respective container are N_{1}, N_{2}and N_{3}. the gas pressure in the container are P_{1}, P_{2}, and P_{3}respectively. All the gasses are now mixed and put in one of these containers. The pressure P of the mixture is- P < (P
_{1}+ P_{2}+ P_{3}) - P = (P
_{1}+ P_{2}+ P_{3}) - P > (P
_{1}+ P_{2}+ P_{3})

- P < (P

If 70 calories heat is required to raise the temperature of 2 moles of an ideal gas at constant pressure from 30°C to 35°C. the amount of heat required to raise the temperature of the same gas through the same range at constant volume is- 20 cal
- 30 cal
- 40 cal
- 50 cal