WAEC Physics questions: Gas laws

11 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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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· 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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5. Question 5· 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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6. Question 6· 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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7. Question 7· 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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8. Question 8· 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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9. Question 9· 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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10. Question 10· 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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11. Question 11· Gas laws· WAEC

    The law stating that the volume of a fixed mass of gas at constant pressure is directly proportional to its absolute temperature is

    • ABoyle's law
    • Bthe pressure law
    • CCharles' law
    • DHooke's law

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    Explanation and discussion