A steel tape gives correct measurement at 20^ | vedclass

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Question

(B) The steel tape is calibrated to be correct at $20^{\circ}C$. When the temperature decreases to $0^{\circ}C$,the steel tape undergoes thermal contr

Vedclass · Accepted Answer

$< 25 \, cm$

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(B) The steel tape is calibrated to be correct at $20^{\circ}C$. When the temperature decreases to $0^{\circ}C$,the steel tape undergoes thermal contraction. Due to contraction,the markings on the tape shift closer together,meaning the distance between the $0$ and $25 \, cm$ marks becomes physically shorter than $25 \, cm$ at $20^{\circ}C$. Since the tape is shorter,it will require more 'tape length' to cover the same physical object. Therefore,a reading of $25 \, cm$ on a contracted tape corresponds to a physical length that is less than $25 \, cm$. Thus,the real length of the wood is less than $25 \, cm$.

$A$. Entropy	$I$. Angular velocity
$B$. Young's modulus of elasticity	$II$. Boltzmann constant
$C$. Angular momentum	$III$. Energy density
$D$. Decay constant	$IV$. Planck's constant

$LIST$-$I$	$LIST$-$II$
$A$. Planck's constant	$I$. $ML^2T^{-2}$
$B$. Stopping potential	$II$. $T^{-1}$
$C$. Work function	$III$. $ML^2T^{-1}$
$D$. Threshold frequency	$IV$. $ML^2T^{-3}A^{-1}$

List-$I$	List-$II$
$A$. Young's Modulus $(Y)$	$I$. $[M L^{-1} T^{-1}]$
$B$. Co-efficient of Viscosity $(\eta)$	$II$. $[M L^2 T^{-1}]$
$C$. Planck's Constant $(h)$	$III$. $[M L^{-1} T^{-2}]$
$D$. Work Function $(\varphi)$	$IV$. $[M L^2 T^{-2}]$

$A$ steel tape gives correct measurement at $20^{\circ}C$. $A$ piece of wood is being measured with the steel tape at $0^{\circ}C$. The reading is $25 \, cm$ on the tape. The real length of the given piece of wood must be:

Similar Questions

Which of the following pairs of physical quantities possess the same dimension?

If $e$ is the charge,$V$ is the potential difference,and $T$ is the temperature,then the units of $\frac{eV}{T}$ are the same as that of:

Match the following physical quantities in $LIST$-$I$ with their dimensional formulas in $LIST$-$II$:
$LIST$-$I$ $LIST$-$II$
$A$. Planck's constant $I$. $ML^2T^{-2}$
$B$. Stopping potential $II$. $T^{-1}$
$C$. Work function $III$. $ML^2T^{-1}$
$D$. Threshold frequency $IV$. $ML^2T^{-3}A^{-1}$

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