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Class 9 Physics · Chapter 6 · Test 6

Mixed Revision

39 MCQs

MCQs

39 questions · 30 min · 39 marks

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Sample questions

The first 5 of 39. Try each one, then tap to see the answer.

  1. Question 1

    The ability of a material to regain its original shape after removal of a deforming force is called:

    • APlasticity
    • BElasticity
    • CDensity
    • DPressure
    Show answer

    Answer: B

    Elasticity is the ability to return to the original shape after the deforming force is removed, provided the elastic limit is not exceeded.

  2. Question 2

    A spring extends 20 mm under a force of 40 N. Its spring constant is:

    • A200 N/m
    • B800 N/m
    • C2,000 N/m
    • D20,000 N/m
    Show answer

    Answer: C

    k = F/x = 40/0.020 = 2,000 N/m.

  3. Question 3

    A spring has a spring constant of 2,000 N/m. What force produces an extension of 16 mm?

    • A16 N
    • B20 N
    • C24 N
    • D32 N
    Show answer

    Answer: D

    F = kx = 2,000 × 0.016 = 32 N.

  4. Question 4

    The SI unit of spring constant is:

    • AN/m
    • BN/m²
    • Ckg/m³
    • DJ/m
    Show answer

    Answer: A

    Spring constant is force divided by extension, so its unit is N/m.

  5. Question 5

    A wire is stretched by a fixed load. If its diameter is reduced to half, its extension becomes:

    • ATwice
    • BFour times
    • CHalf
    • DOne-quarter
    Show answer

    Answer: B

    Extension is inversely proportional to cross-sectional area, which is proportional to diameter squared. Halving the diameter makes the extension four times greater.

More tests in Mechanical Properties of Matter

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