JAMB Physics questions: Elasticity

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

1. Question 1· Elasticity· JAMB

   Tensile strain is

   • Aforce per unit area
   • Bextension divided by original length
   • Cforce times extension
   • Dlength divided by extension

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2. Question 2· Elasticity· JAMB

   A force of 100 N acts on a wire of cross-sectional area 2 mm². Find the stress.

   • A200 Pa
   • B50 Pa
   • C5 × 10⁷ Pa
   • D5 × 10⁴ Pa

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3. Question 3· Elasticity· JAMB

   A wire under a stress of 2 × 10⁸ Pa has a strain of 0.001. Find the Young's modulus of the wire.

   • A2 × 10⁸ Pa
   • B2 × 10⁵ Pa
   • C2 × 10¹¹ Pa
   • D5 × 10⁻¹² Pa

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4. Question 4· Elasticity· JAMB

   A spring extends by 4 cm when a load of 2 N is hung on it. The force constant of the spring is:

   • A0.5 N/m
   • B8 N/m
   • C50 N/m
   • D200 N/m

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5. Question 5· Elasticity· JAMB

   A spring of force constant 400 N/m is pulled by a force of 20 N. Find its extension.

   • A0.05 m
   • B20 m
   • C8000 m
   • D0.5 m

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6. Question 6· Elasticity· JAMB

   A spring of force constant 200 N/m is stretched by 0.1 m. Find the energy stored in it.

   • A20 J
   • B2 J
   • C10 J
   • D1 J

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7. Question 7· Elasticity· JAMB

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

   • A5 cm
   • B8 cm
   • C20 cm
   • D2.5 cm

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8. Question 8· Elasticity· JAMB

   When a wire is stretched beyond its elastic limit, it

   • Abecomes a better conductor
   • Breturns to its original length
   • Cbecomes shorter
   • Dundergoes plastic deformation and does not return to its original length

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9. Question 9· Elasticity· JAMB

   Hooke's law holds provided that

   • Athe load is removed
   • Bthe wire is heated
   • Cthe elastic limit is not exceeded
   • Dthe wire is very long

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10. Question 10· Elasticity· JAMB

    

    The graph shows how the extension of a spring varies with the load on it. Find the force constant of the spring.

    • A50 N/m
    • B0.5 N/m
    • C2 N/m
    • D200 N/m

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11. Question 11· Elasticity· JAMB

    The yield point of a material is the point at which it

    • Areturns to its original length
    • Bbreaks
    • Cobeys Hooke's law
    • Dbegins to stretch a lot for little extra force (plastic flow)

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12. Question 12· Elasticity· JAMB

    Hooke's law states that the extension of a spring is proportional to the applied force provided that

    • Athe force is less than 10 N
    • Bthe spring is made of steel
    • Cthe elastic limit is not exceeded
    • Dthe spring is horizontal

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13. Question 13· 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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14. Question 14· 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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    Explanation and discussion