JAMB and WAEC Physics questions

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

1. Question 61· Conduction of electricity through liquids and gases· JAMB

   In electroplating a spoon with silver, the spoon is made the

   • Aanode
   • Bcathode
   • Celectrolyte
   • Dbattery

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2. Question 62· Conduction of electricity through liquids and gases· WAEC

   Electroplating a spoon with silver uses the spoon as the

   • Aelectrolyte
   • Banode
   • Ccathode
   • Dbattery

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3. Question 63· Conduction of electricity through liquids and gases· JAMB

   In a cathode-ray tube, the electrons are produced by

   • Athermionic emission from a heated cathode
   • Bradioactive decay
   • Cfriction
   • Dchemical action

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4. Question 64· Conduction of electricity through liquids and gases· WAEC

   The mass of a substance liberated in electrolysis is proportional to the

   • Aquantity of charge passed
   • Bvoltage
   • Celectrode size
   • Dtemperature

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5. Question 65· Conduction of electricity through liquids and gases· WAEC

   A current of 2 A passes through copper sulphate solution for 30 minutes. Find the mass of copper deposited. [electrochemical equivalent of copper = 3.3 × 10⁻⁷ kg/C]

   • A3.96 × 10⁻⁵ kg
   • B5.94 × 10⁻⁴ kg
   • C1.98 × 10⁻⁵ kg
   • D1.19 × 10⁻³ kg

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6. Question 66· Conduction of electricity through liquids and gases· JAMB

   Cathode rays are streams of

   • Aelectrons
   • Bprotons
   • Celectromagnetic waves
   • Dneutrons

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7. Question 67· Conduction of electricity through liquids and gases· WAEC

   In the electrolysis of acidified water, which gas is given off at the cathode?

   • Achlorine
   • Boxygen
   • Chydrogen
   • Dnitrogen

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8. Question 68· Current electricity· WAEC

   Three 6 Ω resistors are connected in parallel. The effective resistance is

   • A3 Ω
   • B18 Ω
   • C6 Ω
   • D2 Ω

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9. Question 69· Current electricity· JAMB

   

   In the circuit shown, the battery has negligible internal resistance. Find the current drawn from the battery.

   • A1 A
   • B1.2 A
   • C6 A
   • D3 A

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10. Question 70· Current electricity· WAEC

    A current of 0.5 A flows for 2 minutes. How much charge passes?

    • A30 C
    • B1 C
    • C240 C
    • D60 C

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11. Question 71· Current electricity· JAMB

    

    In the circuit shown, the cell has negligible internal resistance. Find the effective resistance of the three resistors.

    • A0.67 Ω
    • B15 Ω
    • C2.0 Ω
    • D1.5 Ω

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12. Question 72· Current electricity· WAEC

    Resistors of 4 Ω, 6 Ω and 10 Ω are connected in series. Find their total resistance.

    • A10 Ω
    • B1.9 Ω
    • C240 Ω
    • D20 Ω

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13. Question 73· Current electricity· JAMB

    

    In the circuit shown, the cell has negligible internal resistance. Find the current through the 3 Ω resistor.

    • A0.5 A
    • B1.0 A
    • C2.0 A
    • D3.0 A

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14. Question 74· Current electricity· JAMB

    A wire has a resistance of 10 Ω. Another wire of the same material, twice as long and with twice the cross-sectional area, has a resistance of

    • A10 Ω
    • B20 Ω
    • C40 Ω
    • D5 Ω

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15. Question 75· Current electricity· WAEC

    Resistors of 2 Ω, 3 Ω and 5 Ω are connected in series. Their total resistance is

    • A10 Ω
    • B1 Ω
    • C30 Ω
    • D0.97 Ω

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16. Question 76· Current electricity· JAMB

    A resistor of 5 Ω carries a current of 2 A. The potential difference across it is:

    • A2.5 V
    • B7 V
    • C10 V
    • D0.4 V

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17. Question 77· Current electricity· WAEC

    An ammeter is connected in a circuit

    • Aacross the cell
    • Bin parallel
    • Cin series
    • Dacross the resistor

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18. Question 78· Current electricity· JAMB

    In a circuit, an ammeter is connected

    • Ain series, like a voltmeter
    • Bin parallel, and a voltmeter in series
    • Cin parallel, like a voltmeter
    • Din series, and a voltmeter in parallel

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19. Question 79· Current electricity· JAMB

    A charge of 60 C passes a point in a circuit in 2 minutes. The current is:

    • A30 A
    • B0.5 A
    • C120 A
    • D2 A

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20. Question 80· Current electricity· JAMB

    

    In the circuit shown, the battery has negligible internal resistance. Find the current through the 6 Ω resistor.

    • A3 A
    • B2 A
    • C1 A
    • D0.5 A

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    Explanation and discussion