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1. units,dimensions and measurement — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics1. units,dimensions and measurement1 Mark
MCQ
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$ : Product of Pressure $(P)$ and time $(t)$ has the same dimension as that of coefficient of viscosity.

Reason $R$ : Coefficient of viscosity $=\frac{\text { Force }}{\text { Velocity gradient }}$

Question : Choose the correct answer from the options given below 

  • A
    Both $A$ and $R$ true, and $R$ is correct explanation of $A$
  • B
    Both $A$ and $R$ are true but $R$ is $NOT$ the correct explanation of $A$.
  • ✓
    $A$ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.
✓

Answer

Correct option: C.
$A$ is true but $R$ is false.
c
Pressure and time

$P : \frac{ N }{ m ^{2}}, \text { Time : Sec }$

$Pt =\frac{ Nsec }{ m ^{2}}$

$\eta=\frac{ F }{6 \pi r v}: \frac{ N }{ m \cdot m / sec }: \frac{ Nsec }{ m ^{2}}$

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