JAMB Physics questions

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

1. Question 121· Electrostatics· JAMB

   On a charged conductor, charge collects mainly

   • Aon the outer surface, especially at sharp points
   • Bat its centre
   • Cin its inner core
   • Dnowhere

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2. Question 122· Electrostatics· JAMB

   Two charges of 2 μC each are 0.3 m apart. Find the force between them. (k = 9 × 10⁹ N m²/C²)

   • A1.2 × 10⁻⁵ N
   • B0.12 N
   • C4 N
   • D0.4 N

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3. Question 123· Electrostatics· JAMB

   When a plastic rod is rubbed with a cloth, it becomes charged because

   • Aneutrons are removed
   • Bprotons move into the rod
   • Cthe rod is heated
   • Delectrons are transferred between the rod and the cloth

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4. Question 124· Electrostatics· JAMB

   A lightning conductor protects a building by

   • Astoring charge
   • Bdischarging charge through its sharp points to earth
   • Cattracting rain
   • Dinsulating the building

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5. Question 125· Electrostatics· JAMB

   Electric field lines point from

   • Anegative charges to positive charges
   • Bpositive charges to negative charges
   • Cnorth to south
   • Dearth to the charge always

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6. Question 126· Electrostatics· JAMB

   When a conductor is charged by induction, the charge it finally acquires is

   • Azero
   • Bthe same as that of the inducing charge
   • Calways positive
   • Dopposite to that of the inducing charge

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7. Question 127· Electrostatics· JAMB

   Two charges of like sign placed near each other will:

   • Aattract
   • Bneutralise
   • Crepel
   • Dnot interact

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8. Question 128· Electrostatics· JAMB

   Two point charges attract with force F. If each charge is doubled and the distance between them is also doubled, the new force is

   • AF/4
   • B4F
   • CF
   • D2F

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9. Question 129· Electrostatics· JAMB

   A positively charged rod is brought near the cap of a negatively charged electroscope. The leaf

   • Arises further
   • Bfalls (its divergence decreases)
   • Cstays unchanged
   • Dfalls and then rises at once

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10. Question 130· Electrostatics· JAMB

    A lightning conductor works on the principle of

    • AOhm's law
    • Belectromagnetic induction
    • Cthe heating effect of current
    • Daction at sharp points

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11. Question 131· Electrostatics· JAMB

    The SI unit of electric field intensity is

    • Avolt
    • Bcoulomb per newton
    • Cnewton per coulomb
    • Dfarad

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12. Question 132· Electrostatics· JAMB

    One volt is equal to one

    • Acoulomb per second
    • Bjoule per coulomb
    • Cjoule per second
    • Dnewton per coulomb second

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13. Question 133· Electrostatics· JAMB

    Find the electric field strength 0.2 m from a point charge of 4 × 10⁻⁹ C. [k = 9 × 10⁹ N m²/C²]

    • A180 N/C
    • B900 N/C
    • C36 N/C
    • D9,000 N/C

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14. Question 134· Elementary modern physics· JAMB

    80 g of a radioactive substance decays to 10 g in 15 days. Find its half-life.

    • A7.5 days
    • B5 days
    • C3 days
    • D15 days

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15. Question 135· Elementary modern physics· JAMB

    A photon has energy 3.96 × 10⁻¹⁹ J. Find its frequency. [h = 6.6 × 10⁻³⁴ J s]

    • A2.6 × 10⁻⁵³ Hz
    • B6 × 10¹⁵ Hz
    • C6 × 10¹⁴ Hz
    • D1.7 × 10¹⁴ Hz

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16. Question 136· Elementary modern physics· JAMB

    Nuclear fission is the

    • Asplitting of a heavy nucleus into lighter nuclei
    • Bjoining of light nuclei
    • Cemission of light
    • Dloss of electrons

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17. Question 137· Elementary modern physics· JAMB

    Which radiation has the greatest penetrating power?

    • Agamma
    • Bbeta
    • Calpha
    • Dinfrared

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18. Question 138· Elementary modern physics· JAMB

    Light of photon energy 5 eV falls on a metal of work function 2 eV. Find the maximum kinetic energy of the emitted electrons.

    • A7 eV
    • B3 eV
    • C2.5 eV
    • D10 eV

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19. Question 139· Elementary modern physics· JAMB

    In a nuclear power station, energy is released mainly by

    • Aburning coal
    • Bfusion of hydrogen nuclei
    • Cfission of uranium nuclei
    • Dchemical reactions

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20. Question 140· Elementary modern physics· JAMB

    In the decay ²³⁸₉₂U → ²³⁴₉₀Th + X, the particle X is

    • Aa neutron
    • Ba beta particle
    • Ca gamma ray
    • Dan alpha particle

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