JAMB and WAEC Physics questions

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

1. Question 301· Friction· WAEC

   Friction is useful because it

   • Awears out machine parts
   • Ballows the brakes of a car to work
   • Cproduces unwanted heat
   • Dwastes energy

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2. Question 302· Friction· JAMB

   Ball bearings reduce friction because

   • Athey add weight
   • Bthey increase the normal reaction
   • Cthey make surfaces rough
   • Drolling friction is less than sliding friction

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3. Question 303· Friction· JAMB

   A block just begins to slide down a plane inclined at angle θ to the horizontal. The coefficient of static friction is

   • Atan θ
   • Bsin θ
   • Ccos θ
   • D1/tan θ

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4. Question 304· Friction· WAEC

   Which of the following reduces friction between moving parts of a machine?

   • ALubrication
   • BRoughening the surfaces
   • CIncreasing the load
   • DUsing sand

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5. Question 305· Friction· WAEC

   Which of these reduces friction between moving parts?

   • Aremoving the ball bearings
   • Broughening the surfaces
   • Cincreasing the normal reaction
   • Dlubricating them with oil

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6. Question 306· Friction· WAEC

   The friction acting on a body sliding over a surface is usually

   • Azero
   • Bgreater than the limiting friction
   • Cequal to its weight
   • Dless than the limiting friction

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7. Question 307· Friction· WAEC

   A block of weight 50 N needs a horizontal force of 20 N to slide at constant speed. The coefficient of kinetic friction is

   • A2.5
   • B0.4
   • C0.2
   • D70

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8. Question 308· Friction· JAMB

   An advantage of friction is that it

   • Aslows down vehicles unnecessarily
   • Bcauses wear of machine parts
   • Cwastes energy as heat
   • Denables us to walk without slipping

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9. Question 309· Friction· JAMB

   Which of the following reduces friction between moving parts?

   • Aincreasing the normal reaction
   • Broughening the surfaces
   • Clubrication
   • Dremoving ball bearings

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   Explanation and discussion

10. Question 310· Friction· WAEC

    A horizontal force of 12 N just moves a block of weight 40 N on a level floor. Find the coefficient of static friction.

    • A28
    • B3.3
    • C0.48
    • D0.3

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11. Question 311· 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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12. Question 312· 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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13. Question 313· 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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14. Question 314· 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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15. Question 315· 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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16. Question 316· 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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17. Question 317· 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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18. Question 318· 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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19. Question 319· 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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20. Question 320· 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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