# States Of Matter – Multiple Choice Questions

Q1. Viscosity arises due to:

1. Surface tension
2. Density of fluid
3. Internal friction between layers of fluid
4. Kinetic energy of molecules of fluid

Q2. According to Boyle’s law ______ .

1. P x V = K
2. P = V x K
3. P/V = KT
4. None of the above

Q3. A gas will approach ideal behaviour at:

1. Low temperature, low pressure
2. Low temperature, high pressure
3. High temperature, low pressure
4. High temperature , high pressure

Q4. The value of universal gas constant R depends on:

1. Temperature of gas
2. Volume of gas
3. Number of moles of gas
4. Units of volume and pressure

Q5. According to the kinetic theory of gases, the effect of an increase in temperature on the distribution of molecular speeds is that

1. The most probable speed increases
3. The fraction of molecules, with most probable speed increases
4. Area under distribution curve remains the same as that of under lower temperature

Q6. High polarisability increases the strength of:

1. London forces
2. Vander waals forces
3. Dipole-dipole forces
4. Dipole-induced dipole forces

Q7. A vessel contains 0.16g of methane and 0.28g of nitrogen. The ratio of partial pressures of methane to nitrogen in the mixture is about:

1. 4 : 7
2. 2 : 3
3. 7 : 4
4. 1 : 1

Q8. The value of R (Universal gas constant) in SI unit is

1. 0.008206 L atm/mol/K
2. 0.08206 L atm/mol/K
3. 0.008206 L mol/atm/K
4. 0.08206 L mol/atm/K

Q9. The zero point temperature is:

1. 273 K
2. 0oC
3. -273.15oC
4. 25oC

Q10. Vapour density of a diatomic elementary gas is 16. The atomic mass of gas is:

1. 32
2. 16
3. 8
4. 64

Q11. The phenomenon responsible for spherical shape of liquid drops is:

1. Interference
2. Diffraction
3. Surface tension
4. Viscosity

Q12. What happens to an ideal gas when temperature is increases and the pressure is kept constant?

1. As the temperature goes up, the volume decreases
2. As the temperature goes up the volume increases
3. As the temperature go up the number of moles has no change
4. As the temperature go up the number of moles decreases

Q13. A 50L cylinder is filled with argon gas to a pressure of 0130.0kPa at 30oC. How many moles of argon gas are in the cylinder?

1. 200
2. 201
3. 205
4. 208

Q14. The vapour pressure of a liquid depends upon:

1. Volume of liquid
2. Surface area of liquid
3. Nature of liquid
4. Density of liquid

Q15. In the process of conversion of a solid to liquid the average distance between the molecules is

1. beyond 10-7 cm
2. beyond 10-6 cm
3. 10-8 cm
4. 10-2 cm

Q16. For a fixed number of moles of a gas at constant volume, the pressure of the gas increases with rise of temperature due to

1. Increase in molecular attraction
2. Increased rate of collisions amongst molecules
3. Decrease in mean free path
4. Increase in average molecular speed

Q17. In dipole-induced dipole forces, the dipole moments (μ) of polar and non polar molecules are

1. μ > 0 and μ = 0
2. μ < 0 and μ > 0
3. μ = 0 and μ < 0
4. μ = 0 for both

Q18. A polar and a non-polar molecule interact by:

1. Dipole-dipole forces
2. London forces
3. Hydrogen bond
4. Dipole-induced dipole forces

Q19. The strength of London forces do not increase with the increase in

1. Molecular size
2. Number of electrons
3. Surface area of molecule
4. The distance between two interacting particles

Q20. Magnitude of repulsion rises as the distance separating the molecules:

1. Increases
2. Decreases
3. Remains constant
4. Has no effect on repulsion

Q21. The graph of variation in volume (V) plotted against 1/P at a constant temperature is _______ .

1. straight line paralled to X-axis
2. straight line passing through origin
3. parabolic
4. hyperbolic

Q22. Sublimation involves the direct state change from:

1. Liquid to solid
2. Solid to liquid
3. Gas to liquid
4. Solid to gas

Q23. Thermal energy is responsible for:

1. Movement of particles
2. Polarisability of particles
3. Density of the particles
4. Charges on the particles

Q24. A certain sample of gas has a volume of 0.2 litre measured at 1atm. pressure and 0oC. At the same pressure but at 273oC, its volume will be

1. 0.4 litres
2. 0.8 litres
3. 27.8 litres
4. 55.6 litres

Q25. Boiling is the condition of:

1. Restricted vapourisation throughout the liquid
2. Free vapourisation throughout the liquid
3. Increasing the density of the liquid
4. Liquefaction of liquid

Q26. Among the following, the force that is not included in vander Waals forces is

1. London forces
2. Dipole-dipole forces
3. Dipole-induced dipole forces
4. Covalent bond

Q27. Use of hot air balloons is an application of:

1. Charles’ law
2. Gay Lussac’s law
4. Boyle’s law

Q28. Greater the viscosity,

1. More quickly the liquid flows
2. More slowly the liquid flows
3. More quickly the liquid expands
4. More slowly the liquid expands

Q29. The partial charges present on an atom are

1. Greater than the unit charge
2. Less than the unit charge
3. Equal to the unit charge
4. Does not depend on the unit charge

Q30. A cylinder of V litre capacity contains ammonia gas. This cylinder is inverted over another vessel of V litre capacity containing hydrogen chloride at the same temperature and pressure. The pressure in the cylinder after sometime will

1. Double
2. Remain same
3. Drop
4. Become 3/2 of the original pressure

Q31. The average kinetic energy of 32g of methane molecules at 27C is

1. 68.38 J
2. 7482.6 J
3. 8243 J
4. 2493 J

Q32. Which of the following reactions is possible in the given conditions?

1. CO2 and CO at room temperature
2. CO2 and N2O at room temperature
3. CO2 and C2H4 at room temperature
4. NH3 and HCl at room temperature

Q33. The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be:

1. 0.8 atm
2. 0.2 atm
3. 0.4 atm
4. 0.6 atm

Q34. Calculate the kinetic energy of 1mol of 1g O2 at 47oC.

1. 1.24 x 102 J
2. 1.24 x 103 J
3. 2.24 x 102 J
4. 3.24 x 102 J

Q35. The lines obtained by plotting a graph between volume vs temperature are known as

1. Isobar
2. Isochors
3. Isotones
4. Isotherms

Q36. The conditions necessary for a gas to liquefy are

1. Compression
2. Decrease in the temperature
3. Increase in temperature
4. Both decreasing temperature and compression

Q37. Dipole-dipole interaction energy between stationary polar molecules is:

1. Directly proportional to the third power of the distance between two interacting particles
2. Inversely proportional to the sixth power of the distance between two interacting particles
3. Directly proportional to the sixth power of the distance between two interacting particles
4. Inversely proportional to the third power of the distance between two interacting particles

Q38. The root mean square speed of 32 g of methane molecules at 27C is

1. 68.38
2. 43.23
3. 24.8
4. 16.4

Q39. The S.I unit of viscosity is:

1. N m-2s
2. Nm-1s-1
3. N m s
4. Nm-1 s2

Q40. The ideal gas equation is:

1. pV = nR/T
2. p = VnRT
3. pV = n/RT
4. pV = nRT

#### Thermodynamics – Multiple Choice Questions

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