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PART - I : OBJECTIVE QUESTIONS SINGLE CHOICE TYPE 1. At critical temperature, the surface tension of a liquid : (A) is zero (B) is infinity (C) is same as that at any other temperature (D) cannot be determined 2. A liquid will not wet the surface of a solid if the angle of contact is : (A) 00 (B) 450 (C) 600 (D) > 900 3. The force required to drag a circular flat plate of radius 5 cm on the surface of water is (ST of water is 75 dyne/cm). (A) 30 dyne (B) 60 dyne (C) 750 dyne (D) 750 dyne 4. A liquid rises in a capillary tube when the angle of contact is : (A) an acute one (B) an obtuse one (C) /2 radian (D)  radian 5. Neglecting gravity, the potential energy of a molecule of liquid on the surface of liquid when compared with potential energy of a molecule inside liquid is : (A) greater (B) less (C) equal (D) depending on the liquid sometimes more, sometimes less 6. The lower end of a capillary tube touches a liquid whose angle of contact is 900,the liquid (A) rises into the tube (B) falls in the tube (C) may rise or fall inside (D) neither rises nor falls inside the tube 7. A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2 × 10–2 N to keep the wire in equilibrium. The surface tension, in Nm–1, of water is (A) 0.1 (B) 0.2 (C) 0.001 (D) 0.002 8. In a vessel equal masses of alcohol (sp. gravity 0.8) and water are mixed together. A capillary tube of radius 1 mm is dipped vertically in it. If the mixture rises to a height 5 cm in the capillary tube, the surface tension of the mixture is : (assume contact angle to be zero) (A) 217.8 dyne/cm (B) 234.18 dyne/cm (C) 107.9 dyne/cm (D) 10.79 dyne/cm 9. A glass capillary tube of inner diameter 0.28 mm is lowered vertically into water in a vessel. The pressure to be applied on the water in the capillary tube so that water level in the tube is same as that in the vessel in N/m2 is (surface tension of water = 0.07 N/m and atmospheric pressure = 105 N/m2) : (A) 103 (B) 99 × 103 (C) 100 × 103 (D) 101 × 103 10. The work done in increasing the size of a rectangular soap film with dimensions 8 cm × 3.75 cm to 10 cm × 6 cm is 2 × 10–4 J. The surface tension of the film in N/m is : (A) 1.65 × 10–2 (B) 3.3 × 10–2 (C) 6.6 × 10–2 (D) 8.25 × 10–2 11. A capillary tube is filled with liquid up to a height of 50 cm. The reading when the capillary tube is tilted to an angle of 450 is : (A) 50 cm (B) 50 cm (C) zero (D) none of these 12. When a cylindrical tube is dipped vertically into a liquid, the angle of contact is 1400. When the tube is dipped with an inclination of 400, then the angle of contact is : (A) 1000 (B) 1400 (C) 1800 (D) 600 13. The property of surface tension is to : (A) increase the volume (B) decrease the volume (C) increase the surface area (D) decrease the surface area 14. Radius of a capillary is 2 × 10–3 m. A liquid of weight 6.28 × 10–4 N may remain in the tube if surface tension of the liquid will be : (A) 5 × 10–3 N/

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• 1. PART - I : OBJECTIVE QUESTIONS SINGLE CHOICE TYPE 1. At critical temperature, the surface tension of a liquid : (A) is zero (B) is infinity (C) is same as that at any other temperature (D) cannot be determined 2. A liquid will not wet the surface of a solid if the angle of contact is : (A) 00 (B) 450 (C) 600 (D) > 900 3. The force required to drag a circular flat plate of radius 5 cm on the surface of water is (ST of water is 75 dyne/cm). (A) 30 dyne (B) 60 dyne (C) 750 dyne (D) 750 dyne 4. A liquid rises in a capillary tube when the angle of contact is : (A) an acute one (B) an obtuse one (C) /2 radian (D)  radian 5. Neglecting gravity, the potential energy of a molecule of liquid on the surface of liquid when compared with potential energy of a molecule inside liquid is : (A) greater (B) less (C) equal (D) depending on the liquid sometimes more, sometimes less 6. The lower end of a capillary tube touches a liquid whose angle of contact is 900,the liquid (A) rises into the tube (B) falls in the tube (C) may rise or fall inside (D) neither rises nor falls inside the tube 7. A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2 × 10–2 N to keep the wire in equilibrium. The surface tension, in Nm–1 , of water is (A) 0.1 (B) 0.2 (C) 0.001 (D) 0.002 8. In a vessel equal masses of alcohol (sp. gravity 0.8) and water are mixed together. A capillary tube of radius 1 mm is dipped vertically in it. If the mixture rises to a height 5 cm in the capillary tube, the surface tension of the mixture is : (assume contact angle to be zero) (A) 217.8 dyne/cm (B) 234.18 dyne/cm (C) 107.9 dyne/cm (D) 10.79 dyne/cm 9. A glass capillary tube of inner diameter 0.28 mm is lowered vertically into water in a vessel. The pressure to be applied on the water in the capillary tube so that water level in the tube is same as that in the vessel in N/m2 is (surface tension of water = 0.07 N/m and atmospheric pressure = 105 N/m2) : (A) 103 (B) 99 × 103 (C) 100 × 103 (D) 101 × 103 10. The work done in increasing the size of a rectangular soap film with dimensions 8 cm × 3.75 cm to 10 cm × 6 cm is 2 × 10–4 J. The surface tension of the film in N/m is : (A) 1.65 × 10–2 (B) 3.3 × 10–2 (C) 6.6 × 10–2 (D) 8.25 × 10–2 11. A capillary tube is filled with liquid up to a height of 50 cm. The reading when the capillary tube is tilted to an angle of 450 is : (A) 50 cm (B) 2 50 cm (C) zero (D) none of these 12. When a cylindrical tube is dipped vertically into a liquid, the angle of contact is 1400. When the tube is dipped with an inclination of 400, then the angle of contact is : (A) 1000 (B) 1400 (C) 1800 (D) 600 13. The property of surface tension is to : (A) increase the volume (B) decrease the volume (C) increase the surface area (D) decrease the surface area
• 2. 14. Radius of a capillary is 2 × 10–3 m. A liquid of weight 6.28 × 10–4 N may remain in the tube if surface tension of the liquid will be : (A) 5 × 10–3 N/m (B) 5 × 10–2 N/m (C) 5 N/m (D) 50 N/m 15. A thin metal ring of internal radius 8 cm and external radius 9 cm is supported horizontally from the pan of a balance so that it comes in contact with water in a glass vessel. It is found that an extra weight of 7.48 g is required to pull the ring out of water. The surface tension of water is (A) 80 × 10–3 N/m (B) 75 × 10–3 N/m (C) 65 × 10–3 N/m (D) 70 × 10–3 N/m 16. Three surfaces of liquids are shown here. Find the correct statements : (A) the surface tension of liquid A is infinite and such a surface is not possible practically. (B) in case of liquid B, the resultant force on a molecule on the surface would be downward, and the surface is concave. (C) in case of liquid C, the resultant force due to surface tension is directed downwards (D) the surfaces of all three liquids A, B and C are in equilibrium and so the net force due to surface tension is the same 17. A thin wire is bent in the form of a ring of diameter 3.0 cm. The ring is placed horizontally on the surface of soap solution and then raised up slowly. Upward force necessary to break the vertical film formed between the ring and the solution is – (A) 6T dyne (B) 2T dyne (C) 4T dyne (D) 3T dyne 18. The internal radius of one limb of a capillary U-tube is r1 = 1 mm and the internal radius of the second limb is r2 = 2 mm. The tube is filled with some mercury, and one of the limbs is connected to a vacuum pump. The difference in air pressure when the mercury levels in both limbs at the same height are – (The surface tension & density of mercury are 480 dyn/cm & 13.6 gm/cm respectively) (A) 3.53 mm of Hg (B) 2.53 mm of Hg (C) 4.53 mm of Hg (D) 5.53 mm of Hg 19. A glass plate of length 0.1 m, breadth 15 × 10–3 m and thickness 2 × 10–3 m weighs 8 × 10–3 kg in air. it is held vertically with its longer side horizontal and its lower half immersed in water. If the surface tension of water is 72 × 10–3 N/m, the apparent weight of the plate will be (A) 97.4 × 10–3 N (B) 36.1 × 10–3 N (C) 72.2 × 10–3 N (D) 79.4 × 10–3 N 20. When two glass plates are placed one over the other, there is no difficulty in separating them but if a drop of liquid, say water, is placed between them and squeezed into a thin layer, it requires a considerable force to pull them apart. The reason for this is that (A) the pressure inside the film is less than the outside atmospheric pressure (B) the thin layer of water produces a large resistive force on account of viscosity (C) there is internal friction between the microlayers of the film (D) electrostatic charges of opposite nature are produced between the plates. 21. A glass U-tube is inverted with open ends of the straight limbs, of diameters 0.5 mm and 1.0 mm below the surface of water in a beaker. The air pressure in the upper part is increased until the meniscus in one limb is level with the water outside. The height of water in the other limb will be : (Density of water is 103 kg/m3 and surface tension of water is 7.5 × 10–2 N/m. Take contact angle  = 0º) (A) 6.1 × 10–2 m (B) 3.1 × 10–2 m (C) 4.1 × 10–2 m (D) 8.1 × 10–2 m