- The average speed of gas molecules increases with:
A) Decreasing temperature.
B) Increasing pressure.
C) Increasing temperature.
D) Increasing volume.
Answer: C) Increasing temperature.
Explanation: As temperature increases, the kinetic energy of gas molecules increases, leading to higher average speeds.
- Which gas law relates pressure and volume at constant temperature?
A) Charles’s Law.
B) Gay-Lussac’s Law.
C) Boyle’s Law.
D) Avogadro’s Law.
Answer: C) Boyle’s Law.
Explanation: Boyle’s Law states that pressure and volume of a gas are inversely proportional when temperature is constant.
- If the pressure of a gas is increased at constant volume, what happens to the temperature?
A) It remains constant.
B) It decreases.
C) It increases.
D) It becomes zero.
Answer: C) It increases.
Explanation: According to Gay-Lussac’s Law, increasing pressure at constant volume results in an increase in temperature.
- Which of the following describes an isochoric process?
A) Temperature remains constant.
B) Volume remains constant.
C) Pressure remains constant.
D) No work is done.
Answer: B) Volume remains constant.
Explanation: In an isochoric process, the volume of the gas remains constant, and any heat added results in a change in temperature and pressure.
- The rate of effusion of a gas is inversely proportional to:
A) Its volume.
B) Its temperature.
C) The square root of its molar mass.
D) Its pressure.
Answer: C) The square root of its molar mass.
Explanation: According to Graham’s Law, the rate of effusion is inversely proportional to the square root of the molar mass of the gas.
- Which of the following is true for an ideal gas?
A) It has a definite shape.
B) Its molecules have significant volume.
C) There are no intermolecular forces.
D) It condenses at high temperatures.
Answer: C) There are no intermolecular forces.
Explanation: Ideal gases are characterized by negligible intermolecular forces and the assumption that gas molecules occupy no volume.
- In an adiabatic process, which of the following remains constant?
A) Pressure.
B) Temperature.
C) Volume.
D) No quantity remains constant.
Answer: D) No quantity remains constant.
Explanation: In an adiabatic process, there is no heat exchange with the surroundings, leading to changes in temperature, pressure, and volume.
- The pressure of a gas is the result of:
A) The weight of the gas.
B) The average speed of the molecules.
C) Collisions of gas molecules with the walls of its container.
D) The temperature of the gas.
Answer: C) Collisions of gas molecules with the walls of its container.
Explanation: Pressure arises from the force exerted by gas molecules colliding with the walls of their container.
- According to Avogadro’s Law, which of the following remains constant when comparing equal volumes of different gases?
A) Mass.
B) Temperature.
C) Number of moles.
D) Pressure.
Answer: C) Number of moles.
Explanation: Avogadro’s Law states that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.
- The concept of “thermal conductivity” is relevant in the context of:
A) Gas expansion.
B) Heat transfer.
C) Gas diffusion.
D) Gas effusion.
Answer: B) Heat transfer.
Explanation: Thermal conductivity refers to the ability of a material to conduct heat, which is important in gas mixtures and thermal exchanges.
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