Physics Class 9 ICSE Solutions Goyal Brothers Prakashan. We covered all the Physics Class 9 ICSE Solutions Goyal Brothers Prakashan in this post for free so that you can practice well for the exam.
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Physics Class 9 Quiz Questions for Students
Water does not wet an oily glass because :
(A) Cohesive force of oil > adhesive force between oil and glass
(B) Cohesive force of oil > cohesive force of water
(C) Oil repels water
(D) Cohesive force of water > adhesive force between water and oil molecules
A liquid does not wet the sides of a solid if the angle of contact is :
(A) Zero
(B) Obtuse
(C) Acute
(D) 90°
Option b – Obtuse
Consider a liquid contained in a vessel. The liquid-solid adhesive force is very weak as compared to the cohesive force in liquid. The shape of the liquid surface in the solid will be :
(A) Horizontal
(B) Almost vertical
(C) Concave
(D) Convex
Option d – Convex
In case the angle of contact is obtuse, the free surface of a liquid in a capillary tube is :
(A) Convex
(B) Concave
(C) Plane
(D) None of the above
Option a – Convex
The shape of the surface of a liquid in a tube is concave if
(A) Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces.
(B) Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
(C) The cohesive forces are absent
(D) Cohesive forces are equal to that adhesive forces
Option b – Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
In which of the following case angle of contact is 90°?
(A) Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces
(B) Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
(C) The cohesive forces are absent
(D) Cohesive forces are equal to that adhesive forces
Option d – Cohesive forces are equal to that adhesive forces
The wettability of a surface by a liquid depends primarily on
(A) Surface tension
(B) Density
(C) Angle of contact between the surface and the liquid
(D) Viscosity
Option c – Angle of contact between the surface and the liquid
An oil drop is placed on the surface of the water. It will :
(A) Remains on the surface as a sphere
(B) Remains on the surface as a distorted drop
(C) Spread as a thin layer
(D) Partly be as a spherical droplet and partly as a thin film
Option c – Spread as a thin layer
The shape of the surface of a liquid in a tube is convex if :
(A) Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces.
(B) Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
(C) The cohesive forces are absent
(D) Cohesive forces are equal to that adhesive forces
Option a – Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces
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