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Ch 8 Science Class 9 mcq. We covered all the Ch 8 Science Class 9 mcq in this post for free so that you can practice well for the exam.
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Ch 8 Science Class 9 Objective mcq for Students
Why does oil form a thin layer when poured onto water?
A) Because oil has a higher density than water
B) Because oil has a lower density than water
C) Because oil has a greater surface tension than water
D) Because oil has a lower surface tension than water
Option d – Because oil has a lower surface tension than water
The tendency of a liquid droplet to shrink and attain the smallest possible surface area is mainly due to
A) Surface tension
B) Viscosity
C) Density
D) Vapour pressure
Option a – Surface tension
Which property plays the most significant role in determining the behavior of nanomaterials?
A) force
B) Friction
C) Pressure
D) Temperature
Option b – Friction
What is the primary reason raindrops usually take a spherical shape?
A) The density of the liquid
B) Surface tension
C) Atmospheric pressure
D) Gravitational force
Option b – Surface tension
Raindrops are generally spherical because
A) They fall from great heights
B) Air resistance acts on them
C) Water possesses surface tension
D) None of these
Option c – Water possesses surface tension
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