Questions on Boyle’s Law
Boyle’s Law – Multiple Choice Questions
1. Boyle’s Law relates which two properties of a gas?
A) Pressure and temperature
B) Pressure and volume
C) Temperature and volume
D) Mass and volume
E) Density and temperature
2. Boyle’s Law states that, at constant temperature, the pressure of a gas is:
A) Directly proportional to volume
B) Inversely proportional to volume
C) Proportional to temperature
D) Equal to its volume
E) Independent of volume
3. Mathematically, Boyle’s Law is expressed as:
A) PV = nRT
B) V/T = constant
C) PV = constant
D) P/T = constant
E) V = nRT/P
4. When a gas is compressed at constant temperature, what happens to its pressure?
A) It increases
B) It decreases
C) It remains the same
D) It becomes zero
E) It turns into kinetic energy
5. If the pressure on a gas increases, its volume:
A) Increases
B) Decreases
C) Remains constant
D) Doubles
E) Becomes infinite
6. In Boyle’s Law, which condition must remain constant?
A) Pressure
B) Volume
C) Temperature
D) Number of moles
E) Density
7. A sample of gas occupies 4 L at 2 atm. What is the volume at 4 atm, assuming temperature is constant?
A) 2 L
B) 8 L
C) 6 L
D) 1 L
E) 3 L
8. According to Boyle’s Law, doubling the volume of a gas will:
A) Double the pressure
B) Halve the pressure
C) Not affect the pressure
D) Increase temperature
E) Change the gas’s identity
9. Boyle’s Law applies best to:
A) Solids
B) Liquids
C) Ideal gases
D) Real gases at high pressure
E) High-temperature plasmas
10. In an isothermal process, if volume increases, what must happen to pressure?
A) It must increase
B) It must decrease
C) It must remain constant
D) It becomes negative
E) It fluctuates randomly
11. The product of pressure and volume in Boyle’s Law is:
A) Equal to temperature
B) A constant value
C) A function of mass
D) Zero
E) Proportional to energy
12. A syringe demonstrates Boyle’s Law because:
A) The gas escapes quickly
B) The plunger locks the volume
C) Pulling the plunger increases volume, decreasing pressure
D) It measures chemical composition
E) It cools the gas when pulled
13. Which of the following is not an assumption for Boyle’s Law to hold?
A) Gas behaves ideally
B) Temperature is constant
C) No gas is added or removed
D) Gas condenses to liquid
E) Volume is variable
14. Which graph best represents Boyle’s Law?
A) Straight line increasing (P vs V)
B) Parabola (P vs V²)
C) Hyperbola (P vs V)
D) Sinusoidal wave (P vs t)
E) Linear decrease (V vs T)
15. Boyle’s Law helps explain why:
A) Gases condense at high temperatures
B) Scuba divers experience decompression sickness
C) Balloons burst in the cold
D) Heat causes pressure to rise
E) Liquids evaporate faster in heat
16. Which scenario violates Boyle’s Law?
A) Gas heated during compression
B) Gas kept at constant temperature
C) Volume reduced slowly at room temperature
D) A sealed gas container cooled
E) An isothermal expansion
17. Boyle’s Law is most accurate when:
A) Gas particles are large and sticky
B) High pressure compresses gas into liquid
C) Gases behave ideally at low pressure
D) Gases are reactive
E) There is phase change
18. What happens to the product of pressure and volume if the gas leaks during an experiment?
A) It stays the same
B) It increases
C) It decreases
D) It becomes undefined
E) It becomes infinite
19. In which units must pressure and volume be measured for Boyle’s Law to apply?
A) Any units, as long as they are consistent
B) Only in atm and L
C) Only in Pa and m³
D) Only in mmHg and cm³
E) SI units only
20. Which of the following tools best demonstrates Boyle’s Law in a laboratory?
A) Bunsen burner
B) Mercury thermometer
C) Gas syringe and pressure gauge
D) Voltmeter
E) Spectrometer
Answers with Explanations
1. B – Boyle’s Law connects pressure and volume.
2. B – At constant temperature, pressure is inversely proportional to volume.
3. C – The correct expression: PV = constant.
4. A – Compressing gas reduces volume, increasing pressure.
5. B – Pressure increase → volume decrease (inversely related).
6. C – Temperature must remain constant in Boyle’s Law.
7. A – P₁V₁ = P₂V₂ → 2×4 = 4×V → V = 2 L.
8. B – Doubling volume → halving pressure (inverse).
9. C – Ideal gases follow Boyle’s Law best.
10. B – If volume goes up, pressure must go down.
11. B – PV is constant at constant temperature.
12. C – The plunger increases volume, showing inverse pressure change.
13. D – Condensation invalidates the gas assumption.
14. C – Boyle’s Law graph (P vs V) is a hyperbola.
15. B – Changing pressure affects gas bubbles in divers.
16. A – Heating violates the constant-temperature assumption.
17. C – Ideal behavior is most accurate at low pressure.
18. C – Losing gas decreases the total PV product.
19. A – Units can vary but must be consistent across the equation.
20. C – A gas syringe with pressure gauge is standard for demonstrating Boyle’s Law.
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