List of top Physics Questions on Surface Tension asked in MHT CET

When a capillary is dipped vertically in water, rise of water in capillary is \( h \). The angle of contact is zero. Now the tube is depressed so that its length above the water surface is \( h/2 \). The new apparent angle of contact is
Let \( R_1 \) and \( R_2 \) be radii of two mercury drops. A big mercury drop is formed from them under isothermal conditions. The radius of the resultant drop is
A body performs S.H.M. due to force \(F_1\) with time period \(0.8\,\text{s}\). If the force is changed to \(F_2\), it executes S.H.M. with time period \(0.6\,\text{s}\). Now both the forces act simultaneously in the same direction on the same body. The new periodic time is
A small mass \(m\) is suspended at the end of a wire of negligible mass, length \(L\) and cross-sectional area \(A\). The frequency of oscillation for S.H.M. along the vertical line is \([Y =\) Young’s modulus of the material of the wire\(]\)
The excess pressure inside a soap bubble of volume \( V \) is three times the excess pressure inside a second soap bubble of volume \( V_1 \). The value of \( \left( \frac{V}{V_1} \right) \) is:
A large number of liquid drops each of radius \( r \) coalesce to form a big drop of radius \( R \). The energy released in the process is converted into kinetic energy of the big drop. The speed of the big drop is: (T = surface tension of liquid, \( \rho = \) density of liquid)
The upward force of 10\(^5\) dyne due to surface tension is balanced by the force due to the weight of the water column and \( h \) is the height of water in the capillary. The inner circumference of the capillary is (Surface tension of water = \( 7 \times 10^{-2} \) N/m)
Under isothermal conditions, two soap bubbles of radii $r_1$ and $r_2$ coalesce to form a big drop. The radius of the big drop is
When a mercury drop of radius $R$ breaks into $n$ droplets of equal size, the radius $r$ of each droplet is
A wire of length 10 cm is gently placed horizontally on the surface of water having surface tension of \( 75 \times 10^{-3} \, \text{N/m} \). What force is required to just pull up the wire from the water surface?
Two small drops of mercury each of radius \( R \) coalesce to form a large single drop. The ratio of the total surface energies before and after the change is
Two small drops of liquid of same radius coalesce to form a big drop. The ratio of the total surface energies after and before the change is
The excess pressure inside a spherical drop of water is three times that of another drop of water. The ratio of their surface area is
Water rises to a height of \(15\,\text{mm}\) in a capillary tube having cross-sectional area \(A\). If the cross-sectional area of the tube is made \( \dfrac{A}{3} \), then the water will rise to a height
Water rises upto a height \(h\) in a capillary tube on the surface of the earth. The value of \(h\) increases, if the capillary tube apparatus is kept
Two wires of different materials have same length \( L \) and same diameter \( d \). The second wire is connected at the end of the first wire and forms one single wire of double the length. This wire is subjected to stretching force \( F \) to produce the elongation \( \Delta L \). The two wires have
When wavelength of light used in optical instruments A and B are 4500Å and 6000Å respectively, the ratio of resolving power of A to B will be
In common emitter amplifier, input resistance is \( 1000 \, \Omega \), peak value of input signal voltage is 5 mV and \( \beta = 60 \). The peak value of output current is
The excess pressure inside the first soap bubble of radius \( R_1 \) is two times that inside the second soap bubble of radius \( R_2 \). The ratio of volumes of the first bubble to that of the second bubble is
For a perfectly elastic collision, the coefficient of restitution \( e \) is
Water rises to a height 3 cm in a capillary tube. If cross-sectional area of capillary tube is reduced to \( \frac{1}{10} \)th of initial area then water will rise to a height of
Due to surface tension, the excess pressure inside a smaller drop is 9 units. If 27 smaller drops combine, then the excess pressure inside the bigger drop is
In a sphere of influence, the liquid molecule at its centre is
Two masses of 1 gram and 4 gram are moving with equal kinetic energy. The ratio of the magnitudes of their momenta is
A molecule of water on the surface experiences a net