Answer :

The diagram is given below:

As mentioned in the question the test tube comprises of a cylinder and a hemisphere.

The length(l)and radius(r) of cylinder is 15 & 20 mm respectively.

Capacity of test tube = volume of cylinder + volume of hemisphere.

volume of cylinder = π r^{2} l

volume of hemisphere =

Capacity of test tube = π × 20^{2} × 15 + × π × 20^{3}

= 35437.165 mm^{3}.

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