WAEC Physics questions

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

1. Question 141· 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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2. Question 142· 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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3. Question 143· 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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4. Question 144· 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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5. Question 145· 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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6. Question 146· 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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7. Question 147· 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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8. Question 148· 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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9. Question 149· 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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10. Question 150· Gravitational field· WAEC

    The weight of a 5 kg mass on the moon, where g = 1.6 m/s², is

    • A50 N
    • B8 N
    • C3.1 N
    • D5 N

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11. Question 151· Gravitational field· WAEC

    Gravity on the moon is one-sixth of that on earth. What is the weight of a 12 kg mass on the moon? [g on earth = 10 m/s²]

    • A72 N
    • B120 N
    • C2 N
    • D20 N

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12. Question 152· Gravitational field· WAEC

    A geostationary satellite has a period of

    • A365 days
    • B12 hours
    • C1 hour
    • D24 hours

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13. Question 153· Gravitational field· WAEC

    Compared with its mass on the earth, the mass of a body on the moon is

    • Aone-sixth as much
    • Bsix times as much
    • Cthe same
    • Dzero

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14. Question 154· Gravitational field· WAEC

    Escape velocity is the minimum speed needed for a body to

    • Afall freely
    • Borbit the moon
    • Cleave the earth's gravitational field
    • Dstop moving

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15. Question 155· Gravitational field· WAEC

    The potential energy of a body of mass m at a height h above the ground is

    • Amg/h
    • B½mv²
    • Cmgh
    • Dmh/g

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16. Question 156· Gravitational field· WAEC

    The weight of a body of mass 5 kg on the earth's surface is (g = 10 m/s²)

    • A5 N
    • B500 N
    • C0.5 N
    • D50 N

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17. Question 157· Gravitational field· WAEC

    A man weighs 600 N on the earth's surface. What is his mass? [g = 10 m/s²]

    • A6 kg
    • B600 kg
    • C6000 kg
    • D60 kg

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18. Question 158· Gravitational field· WAEC

    In the absence of air resistance, all bodies falling freely at the same place have the same

    • Aweight
    • Bmass
    • Cacceleration
    • Dvolume

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19. Question 159· Gravitational field· WAEC

    The mass of a body

    • Ais greatest at the poles
    • Bis the same everywhere
    • Cis zero on the moon
    • Dchanges with height

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20. Question 160· Gravitational field· WAEC

    Find the weight on the moon of a 50 kg astronaut. (g on the moon = 1.6 m/s²)

    • A500 N
    • B80 N
    • C31.25 N
    • D51.6 N

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    Explanation and discussion