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Two wires, one of copper and the other of steel, are of same length and cross section. They are welded together to from a long wire. On suspending a weight at its one end, increment in length is found to be 3 cms. If Young’s modulus of steel is double that of copper, the increment in steel wire will be-CorrectIncorrect
On applying the load, the increment in length of a wire is 1 mm. On applying the same load on another wire of same length and material, but having half the radius, the increment will be:CorrectIncorrect
Steel ring of radius r and cross- section A is to be mounted on a wooden disc of radius R (R > r). If the Young’s modulus of steel is Y, then the minimum tensile force required to be developed in the ring so that it can easily get mounted on the disc will be-CorrectIncorrect
A soap bubble is very slowly blown on the end of a glass tube by a mechanical pump which supplied a fixed volume of air every time whatever be the pressure against which it pumping. The excess of pressure inside the bubble varies with time as shown by which of the graph-CorrectIncorrect
A 6 cm long toothpick is floating on the surface of water the surface tension on one side of it is 50 dynes/cm and some camphor placed on the other reduces the surface tension to 45 dynes/cm. The resultant force acting on the toothpick will be (in dynes)CorrectIncorrect
Find the maximum force, in addition to the weight, required to pull a wire frame of 50 cm length from the surface of water, the surface tension of water is 72.8 × 10^–3 N/mCorrectIncorrect
A rectangular film of a certain liquid is 5 cms long and 3 cms is breadth. If the amount of work done in increasing its size to
6 cm × 5 cms is 3 × 10^–4J then the value of surface tension of the liquid is-CorrectIncorrect
A thin wire ring of radius of 2m is placed on the surface a liquid. If a force of 4N is required to pull this ring from the surface of liquid (before the liquid film breaks) then the surface tension of liquid is (Neglecting weight)CorrectIncorrect
Two parallel glass plates are dipping perpendicularly in a liquid of density ρ. The separation between the plates is d and the surface tension is T. The angle of contact for glass is θ. The capillary rise of the liquid between the plates is –CorrectIncorrect
In a U-tube the radii of two columns are respectively r1 and r2 and if a liquid of density d filled in it has level difference of h then the surface tension of the liquid is (θ = 0)CorrectIncorrect