Physics
Pycnometer is an instrument used to measure the

Intensity of solar radiation
Intensity of earthquake
High temperatures
Density

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of adhesion are less
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume

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