JAMB and WAEC Physics questions: Gas laws

24 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Gas laws· WAEC

   A gas occupies 200 cm³ at a pressure of 100 kPa. At constant temperature, what volume will it occupy at 400 kPa?

   • A400 cm³
   • B800 cm³
   • C100 cm³
   • D50 cm³

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   Explanation and discussion

2. Question 2· Gas laws· WAEC

   The pressure law states that at constant volume the pressure of a fixed mass of gas is

   • Ainversely proportional to temperature
   • Bdirectly proportional to its absolute temperature
   • Cconstant
   • Dproportional to volume

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   Explanation and discussion

3. Question 3· Gas laws· WAEC

   A car tyre's pressure rises after a long journey on a hot road because

   • Athe air inside gets hotter at nearly constant volume
   • Bair leaks into the tyre
   • Cthe tyre becomes heavier
   • Dthe volume of air falls

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4. Question 4· Gas laws· JAMB

   The pressure law states that, at constant volume, the pressure of a fixed mass of gas is proportional to its

   • Amass
   • Bvolume
   • Cdensity
   • Dabsolute temperature

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5. Question 5· Gas laws· JAMB

   A gas occupies 600 cm³ at 27 °C. At what temperature will it occupy 400 cm³ if the pressure is constant?

   • A−173 °C
   • B18 °C
   • C200 °C
   • D−73 °C

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6. Question 6· Gas laws· WAEC

   A balloon expands when warmed because, at constant pressure, the volume of a gas

   • Ais constant
   • Bdecreases with temperature
   • Cincreases with temperature
   • Ddepends on its colour

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7. Question 7· Gas laws· JAMB

   A gas occupies 4 litres at 3 atm. Find its volume at 6 atm and the same temperature.

   • A2 litres
   • B8 litres
   • C12 litres
   • D0.5 litres

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8. Question 8· Gas laws· JAMB

   A gas occupies 6 litres at 1 atm and 27 °C. Find its volume at 2 atm and 127 °C.

   • A4 litres
   • B9 litres
   • C2.25 litres
   • D16 litres

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   Explanation and discussion

9. Question 9· Gas laws· WAEC

   A gas occupies 200 cm³ at 300 K. At constant pressure its volume at 450 K is

   • A133 cm³
   • B300 cm³
   • C450 cm³
   • D200 cm³

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10. Question 10· Gas laws· JAMB

    At absolute zero, the molecules of a gas would have

    • Amaximum kinetic energy
    • Bminimum kinetic energy
    • Cinfinite speed
    • Ddoubled mass

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11. Question 11· Gas laws· WAEC

    A gas at 3 atm and 300 K is heated at constant volume to 400 K. Find its new pressure.

    • A2.25 atm
    • B4 atm
    • C3 atm
    • D5 atm

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12. Question 12· Gas laws· JAMB

    According to the kinetic theory, the pressure of a gas is caused by

    • Aheat from the container
    • Bmolecules attracting one another
    • Cthe weight of the gas
    • Dmolecules colliding with the walls of the container

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13. Question 13· Gas laws· JAMB

    A gas occupies 200 cm³ at 1 atm. At constant temperature its volume when the pressure is 4 atm is:

    • A100 cm³
    • B50 cm³
    • C800 cm³
    • D400 cm³

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14. Question 14· Gas laws· JAMB

    Absolute zero is the temperature at which

    • Awater freezes
    • Ba gas would theoretically exert no pressure
    • Cmercury boils
    • Dgases expand most

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15. Question 15· Gas laws· WAEC

    A gas occupies 300 cm³ at 2 atmospheres. Find its volume at 3 atmospheres at the same temperature.

    • A200 cm³
    • B450 cm³
    • C150 cm³
    • D600 cm³

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16. Question 16· Gas laws· JAMB

    The general gas equation for a fixed mass of gas is

    • AV/P = constant
    • BPT = constant
    • CPV/T = constant
    • DPV = T²

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17. Question 17· Gas laws· WAEC

    A gas at 27 °C is heated at constant pressure until its volume doubles. Find its new temperature.

    • A54 °C
    • B327 °C
    • C600 °C
    • D300 °C

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18. Question 18· Gas laws· WAEC

    A gas at 100 kPa occupies 6 litres. At constant temperature its volume at 300 kPa is

    • A2 litres
    • B18 litres
    • C3 litres
    • D6 litres

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19. Question 19· Gas laws· WAEC

    For a fixed mass of gas at constant volume, the pressure is directly proportional to its

    • Adensity squared
    • BCelsius temperature
    • Cvolume
    • Dabsolute (kelvin) temperature

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20. Question 20· Gas laws· JAMB

    A gas at 2 atm and 27 °C is heated at constant volume to 127 °C. Find its new pressure.

    • A9.4 atm
    • B2.67 atm
    • C1.5 atm
    • D4 atm

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    Explanation and discussion