Q.

Assertion : A rain drop after falling through some height attains a constant velocity.
Reason : At constant velocity, the viscous drag is just equal to its weight. 

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a

If both assertion and reason are true and the reason is the correct explanation of the assertion

b

If both assertion and reason are true but reason is not the correct explanation of the assertion

c

If assertion is true but reason is false

d

If the assertion and reason both are false

answer is A.

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Detailed Solution

ρ=ρ0(1γ.Δθ)=13.6[10.18×103(473273)]

=13.6[10.036]=13.11   gm/cc

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