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5.work,energy,power and collision — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
$Assertion$ : Graph between potential energy of a spring versus the extension or compression of the spring is a straight line.

$Reason$ : Potential energy of a stretched or compressed spring, proportional to square of extension or compression.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If both the Assertion and Reason are incorrect.
  • ✓
    If the Assertion is incorrect but Reason is correct.
✓

Answer

Correct option: D.
If the Assertion is incorrect but Reason is correct.
d
Potential energy $U = \frac{1}{2}\,K{x^2}$ ie $U \propto {x^2}$ This is a equation of parabola, so graph between $U$ and $x$ is a parabola not a straight line

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