WBBSE Class 10 Physical Science Chapter 2 Behaviour Of Gases Multiple Choice Questions

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Chapter 2 Behaviour Of Gases MCQs

Question 1. In the ideal gas equation PV = nRT, the value of R depends upon :

  1. Unit of measurement
  2. Temperature of gas
  3. Pressure of gas
  4. Nature of gas

Answer: 1. Unit of measurement.

Question 2. An ideal gas is one which :

  1. Obeys gas laws
  2. Obeys Boyle’s law
  3. obeys Chaple’s law
  4. Avogadro’s law

Answer: 1. Obeys gas laws.

Question 3. The volume of any gas at this temperature becomes zero :

  1. + 273°C
  2. – 273°C
  3. 273K
  4. 273K

Answer: 2. -273°C.

Question 4. P1 V1 = P2 V2 , is related to:

  1. Boyle’s law
  2. Charle’s law
  3. Regnault’s law
  4. None of these

Answer: 1. Boyle’s law.

WBBSE Class 10 Physical Science Question Answer In English

Question 5. Normal pressure is :

  1. 1.013 x 106 dyne/cm2
  2. 2.013 x 106 dyne/cm2
  3. 1.05 x 10% dyne/cm2
  4. 1.09 x 106 dyne/cm2

Answer: 1. 1.013 × 10% dyne/cm2

Question 6. The relation between the pressure, temperature and density of a gas is:

  1. \(\frac{\mathrm{PT}}{\mathrm{D}}=\text { constant }\)
  2. \(\frac{\mathrm{P}}{\mathrm{DT}}=\text { constant }\)
  3. \(\frac{P D}{T}=\text { constant }\)
  4. None of these

Answer: 2. \(\frac{\mathrm{P}}{\mathrm{DT}}=\text { constant }\)

Question 7. What will be the value of 127°C on the kelvin scale?

  1. 127K
  2. 400K
  3. 146 K
  4. 200 K

Answer: 2. 400K.

Question 8. The relation between Celsius and absolute scale is :

  1. T = t + 273
  2. T = t – 273
  3. t=T+273
  4. t = T 273

Answer: 1. T t + 273.

WBBSE Class 10 Physical Science Question Answer In English

Question 9. The boiling point of water in the Kelvin scale is :

  1. OK
  2. 373 K
  3. 100 K
  4. 273 K

Answer: 2. 373 K.

Question 10. For the liquefaction of gas, the favourable conditions are :

  1. low temperature and low pressure
  2. low temperature and a catalyst
  3. low temperature and high pressure
  4. low temperature, high pressure and a catalyst

Answer: 2. low temperature and high pressure.

Question 11. The pressure of real gases is less than the pressure of an ideal gas because of:

  1. Increase in the number of collisions
  2. Finite-size of the molecules
  3. Increase in kinetic energy
  4. Intermolecular forces

Answer: 4. Intermolecular forces.

Question 12. P, V, and T stand for the pressure, volume and temperature of a gas. Which of the following will express Boyle’s law?

  1. V x T when P is constant
  2. \(V \times \frac{1}{P} \text { when } T \text { is constant }\)
  3. PV = RT
  4. PV = nRT

Answer: 2. \(V \times \frac{1}{P} \text { when } T \text { is constant }\)

WBBSE Class 10 Physical Science Question Answer In English

Question 13. The number of gram molecules of oxygen is 6.02 × 1024 Co molecules is:

  1. 8g molecules
  2. 5g molecules
  3. 2g molecules
  4. 0.5g molecules

Answer: 2. 5g molecules.

Question 14. The volume of 4.4g of CO2 at STP is

  1. 22.4
  2. 2.24L
  3. 224 L
  4. 44.8 L

Answer: 2. 2.24L.

Question 15. The kinetic theory of gases proves :

  1. Only Boyle’s law
  2. Only Charles’ law
  3. Only Avogadro’s law
  4. All of these

Answer: 4. all of these.

Question 16. Gas deviates from ideal gas nature because of molecules :

  1. Are colourless
  2. Attract each other
  3. Contain covalent band
  4. Show Brownian movement

Answer: 2. attract each other.

Question 17. One of the following is not the postulate of the kinetic theory of gases :

  1. The actual volume of the molecules is negligible compared to the volume of the gas.
  2. The molecules remain in ceaseless motion.
  3. There are sufficient attractive forces between the molecules.
  4. The average kinetic energy of the gas molecules is directly proportional to the absolute temperature.

Answer: 3. There are sufficient attractive forces between the molecules.

Class 10 Physical Science Solution WBBSE

Question 18. The critical temperature of a gas is the temperature :

  1. Below which it cannot be liquefied
  2. Which it solidifies
  3. Above which it cannot be liquefied
  4. Above which it can no longer remain in the gaseous state.

Answer: 4. Above which it cannot be liquefied.

Question 19. A pressure cooker reduces cooking time because :

  1. The heat is more easily distributed
  2. The higher pressure tenderizes the food
  3. The boiling point of water inside is elevated
  4. A large flame is used.

Answer: 3. The boiling point of water inside is elevated.

Question 20. Which of the following is valid at absolute zero?

  1. The kinetic energy of the gas becomes zero, but the molecular motion does not become zero
  2. The kinetic energy of the gas becomes zero and the molecular motion also becomes zero
  3. The kinetic energy of the gas decreases but does not become zero
  4. None of the above

Answer: 4. None of the above.

Question 21. The temperature at which a real gas obeys the ideal gas laws over an appreciable pressure range is called the :

  1. Critical temperature
  2. Inversion temperature
  3. Boyle’s temperature
  4. Transition temperature

Answer: 3. Boyle’s temperature.

Question 22. What will be the value of 127°C on the Kelvin scale?

  1. 127 K
  2. 400 K
  3. 146 K
  4. 200 K

Answer: 2. 400 K.

Question 23. The relation between 100°C and 373 K is

  1. 100° C > 373 K
  2. 100°C < 373 K
  3. 100°C = 373 K
  4. None of these

Answer: 3. 100°C = 373 K.

Class 10 Physical Science Solution WBBSE

Question 24. At NTP, if the volume of any gas is 10 lit then at 27°C and 750 mm pressure what will be its volume :

  1. 11.1 lit
  2. 15 lit
  3. 8.1 lit
  4. 8.2 lit

Answer: 1. 11.1 lit.

Question 25. At constant mass and constant volume, the relation between pressure and temperature is?

  1. Boyle’s law
  2. Charle’s law
  3. Gay Lussac’s law
  4. None of these

Answer: 3. Gay Lussac’s Law.

Question 26. At constant, mass and constant temperature the relation between volume and pressure is:

  1. Chaple’s law
  2. Boyle’s law
  3. Gay Lussac’s law
  4. None of these

Answer: 2. Boyle’s law.

Question 27. A gas having a temperature of 0°C is heated so that its pressure and volume are doubled. What will be the final temperature of the gas?

  1. 1092 K
  2. 1002 K
  3. 999 K
  4. 980 K

Answer: 1. 1092 K.

Class 10 Physical Science Solution WBBSE

Question 28. A gas will approach ideal behaviour at :

  1. At low temperatures and low pressure
  2. Low temperature and high pressure
  3. High temperature and low pressure
  4. High pressure and high temperature

Answer: 3. High temperature and low pressure.

Question 29. Attractive forces and size effects in a gas can be neglected at:

  1. Low temperature
  2. High pressure
  3. Low pressures and high temperatures
  4. Low temperatures and high pressures

Answer: 3. Low pressures and high temperatures.

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