JAMB and WAEC Physics questions

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

1. Question 141· Elasticity· WAEC

   The SI unit of stress is the

   • Am
   • BN m
   • CN
   • DN m⁻²

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2. Question 142· Elasticity· JAMB

   Two identical springs each stretch 3 cm under a load W. If they are joined end to end (in series) and the same load W is hung on them, the total extension is

   • A1.5 cm
   • B3 cm
   • C6 cm
   • D9 cm

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3. Question 143· Elasticity· WAEC

   Beyond the yield point, a stretched wire

   • Areturns to its original length
   • Bobeys Hooke's law
   • Cundergoes plastic deformation
   • Dhas no extension

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4. Question 144· Elasticity· WAEC

   A spring stretches by 2 cm under a load of 4 N. Find its extension under a load of 10 N, within the elastic limit.

   • A8 cm
   • B20 cm
   • C5 cm
   • D2.5 cm

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5. Question 145· Elasticity· WAEC

   Strain is defined as

   • Aoriginal length divided by extension
   • Bforce divided by area
   • Cforce divided by extension
   • Dextension divided by original length

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6. Question 146· Elasticity· WAEC

   A spring of force constant 200 N/m is stretched by 5 cm. What force is applied?

   • A40 N
   • B1000 N
   • C10 N
   • D4 N

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7. Question 147· Elasticity· JAMB

   A wire 2 m long with a cross-section of 1 × 10⁻⁶ m² stretches 1 mm under a load of 100 N. Find its Young's modulus.

   • A5 × 10¹⁰ Pa
   • B2 × 10⁸ Pa
   • C2 × 10¹¹ Pa
   • D1 × 10¹¹ Pa

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8. Question 148· Electric cells· JAMB

   The e.m.f. of a cell is best measured with a

   • Aammeter
   • Bpotentiometer
   • Cohmmeter
   • Dgalvanometer used alone

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9. Question 149· Electric cells· JAMB

   In a Leclanché dry cell, the positive terminal is the

   • Amanganese(IV) oxide only
   • Bzinc case
   • Cammonium chloride paste
   • Dcarbon rod

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10. Question 150· Electric cells· WAEC

    A cell of e.m.f. 3 V and internal resistance 1 Ω is connected to a 5 Ω resistor. The current is

    • A0.75 A
    • B0.6 A
    • C3 A
    • D0.5 A

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11. Question 151· Electric cells· JAMB

    Polarisation in a simple cell is caused by

    • Aimpurities in the zinc
    • Bhydrogen bubbles collecting on the copper plate
    • Cthe acid becoming too strong
    • Dthe cell overheating

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12. Question 152· Electric cells· JAMB

    Three cells, each of e.m.f. 1.5 V and internal resistance 0.5 Ω, are connected in series. Find the total e.m.f. and internal resistance.

    • A1.5 V and 0.5 Ω
    • B4.5 V and 1.5 Ω
    • C4.5 V and 0.17 Ω
    • D1.5 V and 1.5 Ω

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13. Question 153· Electric cells· JAMB

    A cell of e.m.f. 3 V and internal resistance 1 Ω drives a current through a 5 Ω resistor. Find the terminal potential difference of the cell.

    • A3 V
    • B2.5 V
    • C0.5 V
    • D2 V

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14. Question 154· Electric cells· WAEC

    The e.m.f. of a cell is best measured when the cell is

    • Aconnected to a lamp
    • Bsupplying a large current
    • Cshort-circuited
    • Dsupplying no current

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15. Question 155· Electric cells· JAMB

    An advantage of the lead-acid accumulator over a dry cell is that it

    • Anever runs down
    • Bis lighter
    • Ccontains no liquid
    • Dcan be recharged

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16. Question 156· Electric cells· JAMB

    Connecting identical cells in parallel gives

    • Aa larger e.m.f.
    • Bthe same e.m.f. as one cell with a smaller internal resistance
    • Czero e.m.f.
    • Da larger internal resistance

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17. Question 157· Electric cells· JAMB

    Local action in a simple cell is caused by

    • Aimpurities in the zinc plate
    • Bhydrogen bubbles on the copper
    • Ctoo much acid
    • Da short circuit

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18. Question 158· Electric cells· JAMB

    A lead–acid accumulator is

    • Aa solar cell
    • Ba primary cell
    • Ca dry Leclanché cell
    • Da secondary cell that can be recharged

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19. Question 159· Electric cells· JAMB

    The electromotive force (e.m.f.) of a cell is the

    • Acurrent it produces
    • Bforce on electrons
    • Cenergy it supplies to each coulomb of charge passing through
    • Dresistance inside it

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20. Question 160· Electric cells· WAEC

    A battery of e.m.f. 12 V and internal resistance 2 Ω drives current through a 10 Ω lamp. Find the terminal p.d.

    • A10 V
    • B12 V
    • C2 V
    • D1.2 V

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