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qUESTIONS

MCQs-PYQs-12th-jee

The pressure of air in a soap bubble of 0.7 cm diameter is 8 mm of water above the pressure outside. The surface tension of the soap solution is

MCQs-PYQs-12th-jee

If the surface tension of a soap solution is 0.03 MKS units, then the excess of pressure inside a soap bubble of diameter 6 mm over the atmospheric pressure will be

MCQs-PYQs-12th-jee

A glass plate is partly dipped vertically in the mercury and the angle of contact is measured. If the plate is inclined, then the angle of contact will

MCQs-PYQs-12th-jee

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

MCQs-PYQs-12th-jee

If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be

MCQs-PYQs-12th-jee

A drop of mercury of radius 2 mm is split into 8 identical droplets. Find the increase in surface energy. (Surface tension of mercury is 0.465 J/m²)

MCQs-PYQs-12th-jee

Radius of a soap bubble is ‘r’, surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius

MCQs-PYQs-12th-jee

A spherical liquid drop of radius R is divided into eight equa droplets. If surface tension is T, then the work done in this process will be

MCQs-PYQs-12th-jee

Adding detergent to water helps in removing dirty greasy stains. This is because

MCQs-PYQs-12th-jee

A wooden stick 2 m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be

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