JAMB Physics questions

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

1. Question 1· Capacitors· JAMB

   Find the combined capacitance of 4 μF and 6 μF capacitors connected in parallel.

   • A10 μF
   • B2.4 μF
   • C24 μF
   • D2 μF

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2. Question 2· Capacitors· JAMB

   Find the combined capacitance of a 2 μF and a 3 μF capacitor connected in series.

   • A1.2 μF
   • B5 μF
   • C6 μF
   • D0.83 μF

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3. Question 3· Capacitors· JAMB

   Find the charge on a 10 μF capacitor connected to 50 V.

   • A500 C
   • B5 C
   • C5 × 10⁻⁴ C
   • D2 × 10⁻⁷ C

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4. Question 4· Capacitors· JAMB

   Inserting a slab of dielectric between the plates of a charged, isolated capacitor

   • Adoubles the plate separation
   • Bdecreases its capacitance
   • Cremoves its charge
   • Dincreases its capacitance

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5. Question 5· Capacitors· JAMB

   A capacitor in a circuit

   • Ablocks steady d.c. but allows a.c. to pass
   • Ballows d.c. but blocks a.c.
   • Cblocks both
   • Dallows both equally

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6. Question 6· Capacitors· JAMB

   Find the energy stored in a 4 μF capacitor charged to 100 V.

   • A0.04 J
   • B0.02 J
   • C200 J
   • D2 × 10⁻⁴ J

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7. Question 7· Capacitors· JAMB

   Two 6 μF capacitors are connected in series. Find the combined capacitance.

   • A12 μF
   • B3 μF
   • C36 μF
   • D6 μF

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8. Question 8· Capacitors· JAMB

   The SI unit of capacitance is the

   • Acoulomb
   • Bhenry
   • Cohm
   • Dfarad

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9. Question 9· Capacitors· JAMB

   The capacitance of a parallel-plate capacitor increases when

   • Athe voltage is increased
   • Bthe distance between the plates is increased
   • Cthe dielectric is removed
   • Dthe area of the plates is increased

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10. Question 10· Capacitors· JAMB

    Two capacitors of 2 μF and 3 μF are connected in parallel. Their combined capacitance is:

    • A1.2 μF
    • B0.83 μF
    • C6 μF
    • D5 μF

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11. Question 11· Capacitors· JAMB

    Capacitors of 2 μF, 3 μF and 5 μF are connected in parallel. Their combined capacitance is

    • A0.97 μF
    • B10 μF
    • C30 μF
    • D5 μF

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12. Question 12· Capacitors· JAMB

    A 5 μF capacitor is charged to 12 V. Find the charge stored.

    • A0.42 μC
    • B2.4 μC
    • C17 μC
    • D60 μC

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13. Question 13· Capacitors· JAMB

    Placing a dielectric between the plates of a capacitor increases its capacitance because the dielectric

    • Areduces the electric field between the plates for the same charge
    • Bconducts charge between the plates
    • Cincreases the distance between the plates
    • Dreduces the area of the plates

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14. Question 14· Change of state· JAMB

    Adding salt to ice

    • Alowers its melting point
    • Braises its melting point
    • Chas no effect on its melting point
    • Dturns it into steam

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15. Question 15· Change of state· JAMB

    Increasing the pressure on water

    • Aremoves its latent heat
    • Braises its boiling point
    • Cdoubles its volume
    • Dchanges its colour

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16. Question 16· Change of state· JAMB

    Wet clothes dry faster on a windy day because wind

    • Aadds water
    • Braises the boiling point
    • Cremoves the vapour and speeds up evaporation
    • Dcools the sun

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17. Question 17· Change of state· JAMB

    Evaporation causes cooling because

    • Aheat flows into the liquid
    • Bthe liquid absorbs cold from the air
    • Cthe liquid's mass increases
    • Dthe faster molecules escape, lowering the average kinetic energy of those left

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18. Question 18· Change of state· JAMB

    While a pure liquid is boiling, its temperature

    • Arises and falls
    • Brises steadily
    • Cfalls steadily
    • Dremains constant

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19. Question 19· Change of state· JAMB

    A pressure cooker cooks food faster because

    • Asteam is a poor conductor
    • Bit lowers the boiling point of water
    • Cit uses less water
    • Dthe increased pressure raises the boiling point of water

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20. Question 20· Change of state· JAMB

    The specific latent heat of fusion of a substance is the heat needed to

    • Araise 1 kg of it by 1 K
    • Bchange 1 kg of it from solid to liquid without a change of temperature
    • Cboil 1 kg of it
    • Dmelt any amount of it

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