Sharpen your Physics skills with chapter-wise NEET practice questions. Designed for NEET aspirants, these questions cover all Physics topics.
A thin liquid film formed between a U-shaped wire and a light slider supports a weight of N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is:
0.0125 Nm⁻¹
0.1 Nm⁻¹
0.05 Nm⁻¹
0.025 Nm⁻¹
Water rises to a height of 10 cm in a capillary tube and mercury falls to a depth of 3.5 cm in the same tube. If the density of mercury is 13.6 g/cc and the angle of contact is 135°, the ratio of surface tension of water and mercury is:
0.15
0.25
0.35
0.45
Two capillary tubes of same diameter are dipped in two liquids A and B having densities and () and surface tensions and () respectively. If the angles of contact are same, then:
If , liquid A rises higher
If , liquid A rises higher
If , liquid A rises higher
Both liquids will rise to the same height
A spherical liquid drop of radius 'r' is divided into 'n' identical droplets. If surface tension is 'T', the work done in this process is:
Two soap bubbles of radii and are coalesced isothermally to form a single bubble of radius . If is the external pressure, then the surface tension of the soap solution is:
\frac{P(R^3 - r_1^3 - r_2^3)}{4(r_1^2 + r_2^2 - R^2)}
\frac{P(r_1^3 + r_2^3 - R^3)}{4(R^2 - r_1^2 - r_2^2)}
\frac{P(R^3 - r_1^3 - r_2^3)}{4(R^2 + r_1^2 + r_2^2)}
\frac{P(r_1^3 + r_2^3 + R^3)}{4(r_1^2 + r_2^2 + R^2)}
A liquid drop having surface energy 'E' is spread into '512' identical droplets of same liquid. The final surface energy of these droplets is:
2E
4E
8E
16E
