The liquid meniscus in the capillary tube will be convex if the angle of contact is

(a) Greater than 90°                                 (b) Less than 90°
(c) Equal to 90°                                  (d) Equal to 0°

Concept Questions :-

Capillary rise

Difficulty Level:

The value of contact angle for kerosene with solid surface.
(a) 0°                                     (b) 90°
(c) 45°                                   (d) 33°

Concept Questions :-

Surface tension

Difficulty Level:

Nature of meniscus for liquid of ${0}^{0}$ angle of contact

(a) Plane                               (b) Parabolic
(c) Semi-spherical                  (d) Cylindrical

Concept Questions :-

Surface tension

Difficulty Level:

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is
(a) Flat                                 (b) Concave
(c) Convex                            (d) Cylindrical

Concept Questions :-

Surface tension

Difficulty Level:

For which of the two pairs, the angle of contact is same

(a) Water and glass; glass and mercury

(b) Pure water and glass; glass and alcohol

(c) Silver and water; mercury and glass

(d) Silver and chromium; water and chromium

Concept Questions :-

Surface tension
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is
(a) Acute angle                (b) Obtuse angle
(c) 90°                            (d) 0°

Concept Questions :-

Surface tension
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If two soap bubbles of different radii are in communication with each other

(a) Air flows from larger bubble into the smaller one

(b) The size of the bubbles remains the same

(c) Air flows from the smaller bubble into the large one and the larger bubble grows at the expense of the smaller one

(d) The air flows from the larger

Concept Questions :-

Surface tension
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The surface tension of soap solution is  . The excess pressure inside a soap bubble of diameter 1 cm is

(a) 10 Pa                      (b) 20 Pa

(c) 5 Pa                        (d) None of the above

Concept Questions :-

Surface tension
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

When two soap bubbles of radius ${\mathrm{r}}_{1}$ and ${\mathrm{r}}_{2}$ (${\mathrm{r}}_{2}$>${\mathrm{r}}_{1}$) coalesce, the radius of curvature of common surface is

(a) ${\mathrm{r}}_{2}-{\mathrm{r}}_{1}$                       (b)  $\frac{{\mathrm{r}}_{2}-{\mathrm{r}}_{1}}{{\mathrm{r}}_{2}{\mathrm{r}}_{1}}$

(c) $\frac{{\mathrm{r}}_{2}{\mathrm{r}}_{1}}{{\mathrm{r}}_{2}-{\mathrm{r}}_{1}}$                          (d) ${\mathrm{r}}_{2}+{\mathrm{r}}_{1}$

Concept Questions :-

Surface tension

Difficulty Level:

The excess pressure due to surface tension in a spherical liquid drop of radius r is directly proportional to

(a) r                                 (b) ${\mathrm{r}}^{2}$

(c) ${\mathrm{r}}^{-1}$                               (d) ${\mathrm{r}}^{-2}$

Concept Questions :-

Surface tension