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qUESTIONS

MCQs-PYQs-12th-jee

A capillary tube (A)is dipped in water. Another identical tube (b)is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes

MCQs-PYQs-12th-jee

A glass tube of uniform internal radius (r) has a valve separating the two identical ends. Initially, the valve is in a tightly closed position. End 1 has a hemispherical soap bubble of radius r. End 2 has sub-hemispherical soap bubble as shown in figure. Just after opening the valve

MCQs-PYQs-12th-jee

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

MCQs-PYQs-12th-jee

Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly. (Surface tension of soap solution = 0.03 Nm³¹)

MCQs-PYQs-12th-jee

On heating water, bubbles beings formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If r…R, and the surface tension of water is T. value of r just before bubbles detach is

MCQs-PYQs-12th-jee

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 * 10 ^ – 2 * N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is

MCQs-PYQs-12th-jee

A spherical drop of water has radius 1 mm If surface tension of water is 70×103 N/m difference of pressures between inside and outside of the spherical drop is

MCQs-PYQs-12th-jee

If the radius of a soap bubble is four times that of another, then the ratio of their pressures will be [2000]

MCQs-PYQs-12th-jee

The work done in increasing the size of a soap film from 10 cmx 6 cm to 10 cm x 11 cm is 3 x10^4 joule. The surface tension of the film is

MCQs-PYQs-12th-jee

Two small drops of mercury, each of radius R, coalesce to form a single large drop. The ratio of the total surface energies before and after the change is

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