Question 4: Properties of Matter

Question

Assertion :
Water drops take spherical shape
when falling freely.
Reason :
Water has minimum surface
tension among all liquids.

Accepted Answer

Surface tension is responsible for the shape of tiny water drops when falling freely in the absence of other forces like gravity, shape of water drops is spherical because droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer.
In the presence of gravity, the shape of heavy water drops is not spherical when falling freely. It is oval shaped surface tension of methyl alcohol is lower than surface tension of water.
Hence, water has not minimum surface tension among all liquids.
Therefore, both Assertion and Reason are false.

Answer

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

Answer

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

Answer

If assertion is true, but reason is false.

Answer

If both assertion and reason are false.

Properties of Matter

Assertion : Water drops take spherical shape when falling freely. Reason : Water has minimum surface tension among all liquids.

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