Q.

The physical quantity that has the same dimensional formula as pressure is

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a

force

b

momentum

c

coefficient of viscosity

d

Young's modulus of elasticity 

answer is C.

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Detailed Solution

Dimensional formula of pressure according to its definition,

[P]=[Force][Area]=MLT2L2=ML1T2

Dimensional formula of force =[F]=[ma]= MLT-2.

Dimensional formula of momentum = [mv]= MLT-1.
Young’s modulus,

Y=StressStrain=F/Ae/

where,e=elongationoriginal length=dimensionless.

So, [Y]=MLT2L2=ML1T2

Coefficient of viscosity, according to the definition,  

 Fv=ηAdVdx η=FvdxdVA

where  FV = viscous force 

[dVdx]=[velocity gradiant]=LT1L=T1.

A = area

So,[η]=MLT2LLT1L2=ML1T1

So, correct option is that Young’s modulus of elasticity and pressure has the same dimensional formula.

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