Which of the following quantities has a unit | vedclass

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(C) The correct answer is $C$. $1$. Strain is the ratio of change in dimension to the original dimension,so it is dimensionless and unitless. $2$. Rey

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Angular displacement

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(C) The correct answer is $C$. $1$. Strain is the ratio of change in dimension to the original dimension,so it is dimensionless and unitless. $2$. Reynold's number is a dimensionless quantity used in fluid mechanics. $3$. Angular displacement is defined as the angle subtended by an arc at the center of a circle,given by $	heta = \frac{	ext{arc}}{	ext{radius}}$. It has units of radians $(rad)$ or degrees,but since it is a ratio of two lengths,it is dimensionless. $4$. Poisson's ratio is the ratio of lateral strain to longitudinal strain,making it dimensionless and unitless.

Column-$I$	Column-$II$
$(a)$ Ratio of change in time period of a simple pendulum with temperature to its original time period	$(i) \, \alpha \Delta T$
$(b)$ Ratio of the value of a length to its scale reading	$(ii) \, T$
$(c)$ Reciprocal of coefficient of volume expansion for an ideal gas of constant pressure	$(iii) \, (1 + \alpha \Delta T)$
$(d) \, \frac{F}{YA} =$	$(iv) \, \frac{1}{2} \alpha \Delta T$

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 $(\phi)$	$(IV)$ $[M L^2 T^{-2}]$

Which of the following quantities has a unit but is dimensionless?

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