JAMB Physics questions

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

1. Question 161· Equilibrium of forces· JAMB

   A body is in unstable equilibrium if, when slightly displaced, its centre of gravity

   • Amoves upward and back
   • Brises
   • Cstays at the same level
   • Dfalls

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2. Question 162· Equilibrium of forces· JAMB

   A couple consists of

   • Atwo equal, opposite, parallel forces not in the same line
   • Btwo forces in the same direction
   • Ca single force
   • Dthree concurrent forces

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3. Question 163· Equilibrium of forces· JAMB

   A uniform beam balances at its centre. A 100 N weight hangs 1 m from the centre. How far from the centre, on the other side, must a 50 N weight hang to keep the beam balanced?

   • A4 m
   • B0.5 m
   • C1 m
   • D2 m

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4. Question 164· Friction· JAMB

   A box presses on the floor with a normal reaction of 50 N. If the coefficient of friction is 0.4, find the limiting friction.

   • A20 N
   • B125 N
   • C50.4 N
   • D12.5 N

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5. Question 165· Friction· JAMB

   Compared with the limiting (static) friction between two surfaces, the kinetic (sliding) friction is

   • Azero
   • Bgreater
   • Cequal
   • Dsmaller

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6. Question 166· Friction· JAMB

   A 20 kg box is pulled across a level floor at constant speed by a horizontal force of 60 N. Find the coefficient of kinetic friction. [g = 10 m/s²]

   • A0.6
   • B3.3
   • C0.3
   • D1.2

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7. Question 167· Friction· JAMB

   A 5 kg block is pulled along a floor by a horizontal force of 30 N against a friction force of 10 N. Find its acceleration.

   • A2 m/s²
   • B6 m/s²
   • C4 m/s²
   • D8 m/s²

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8. Question 168· Friction· JAMB

   A block of weight 40 N on a horizontal surface just starts to move when a horizontal force of 12 N is applied. Find the coefficient of static friction.

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

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9. Question 169· 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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10. Question 170· 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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11. Question 171· 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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12. Question 172· 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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13. Question 173· 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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14. Question 174· 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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15. Question 175· 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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16. Question 176· 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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17. Question 177· 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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18. Question 178· 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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19. Question 179· 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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20. Question 180· 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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