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Force and Laws of Motion — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceForce and Laws of Motion1 Mark
MCQ
In the following Questions, the Assertion and Reason have be put forward. Read the statements careful and choose the correct alternative from the following:
Assertion: The ratio of the $S.I.$ to $C.G.S.$ unit of forces is $10^5.$
Reason: Water evolving out of a hose exerts no force on the pipe.
  • A
    Both the Assertion and the Reason a correct and the Reason is the correct explanation of the Assertion.
  • ✓
    The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  • C
    Assertion is true but the Reason is false.
  • D
    The statement of the Assertion is false but the Reason is true.
✓

Answer

Correct option: B.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
$SI$ unit of force = Newton
$CGS$ unit of force = dyne
$1$ Newton $= 1kg-m/ sec^2$
$= 1000 \times 100gm-cm/ sec^2$
$= 10^5 dyne$
So, Ratio is $10^5$.

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