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June 2022

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10. Air is streaming past a horizontal air plane wing such that its speed in 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of air is 1.3

kg per metre3 and the wing is 10 m long and has an average width of 2 m, then the...

2. A solution of acetone in ethanol

a. Behaves like a near ideal solutions b. Obeys Raoult’s law c. Shows a negative deviation from Raoult’s   law d....

1. A solution with negative deviation among the following is

a. Ethanol- Acetone b. Chlorobenzene- Bromobenzene c. Chloroform- Acetone d. Benzene Toluene ANSWER . C Explanation : Due to hydrogen...

54. At room temperature a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360g of water. If the vapour pressure of pure water at this temperature is 35mmHg, lowering of vapour pressure will be

a. 0.027 mmHg b. 0.028 mmHg c. 0.017mmHg d. 0.031 mmHg Ans. c (65)

53. Which values can be obtained from the information represented by the vapour pressure curve of a liquid

A. Normal boiling point B. Normal freezing point C.  Enthalpy of vaporization a. A  only b. A and B only...

16. If the surface tension of a liquid is T, the gain in surface energy for an increase in liquid surface by A is

(a) AT-1 (b) AT (c)  A2T (d) A2T2 Ans. b (6)

15. If two identical mercury drops are combined to form a single drop, then its temperature will

(a)  Decrease (b)  Increase (c)  Remains the same (d)  None of the above Ans. b (4)

14. The work done in blowing a soap bubble of radius r of the solution of surface tension T will be

(a)  8πr2T (b) 2πr2T (c)  4πr2T (d) (4/3)πr2T Ans. a (6)

13. A spherical drop of oil of radius 1 cm is broken into 1000 droplets of equal radii. If the surface tension of oil is 50 dynes/cm, the work done is

(a)  18 π ergs (b)  180 π ergs (c)  1800 π ergs (d)  8000 π ergs Ans. c (6)

12. If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is

(a)  W/2 (b)  2W (c)   4W (d) (7/3) W Ans. c (33)

11. The surface tension of a liquid is 5 N/m. If a thin film of the area 0.02 m2 is formed on a loop, then its surface energy will be

(a)    5 x 102 j (b)  2.5  x 10-2 j (c)    2 x 10-1 (d)  5 x 10-1 j...

9. If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to 2D is

(a)  2  πD2T (b)  4 πD2T (c)   6  πD2T (d)  8 πD2T Ans. c (11)

8. The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T= surface tension of the solution)

(a) 4π(D2-d2)T (b) 8π(D2-d2)T (c) π(D2-d2)T (d) 2π(D2-d2)T Ans. d (8)

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

(a)  2  πR2T (b)  3 πR2T (c)  4  πR2T (d)  2 πR2T Ans. c (32)

6. Work done in splitting a drop of water of 1 mm radius

into 106 droplets is (Surface tension of water= 72 x 10-3 J/m2 (a) 9.58 x 10-5 j (b) 8.95 x...

7. In the following fig. is shown the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the

(a)  Height of the liquid in the tube A is maximum (b)   Height of the liquid in the tubes A...

6. The velocity of kerosene oil in a horizontal pipe is 5 m/s.

If  g=10 m/s2 then the velocity head of oil will be (a)   1.25 m                                             (b)   12.5 m (c)   0.125 m ...

1. Energy needed in breaking a drop of radius R into n drops of radii r is given by

(a) 4πT(nr2-R2) (b) (4/3)π(r3n-R2) (c)  4πT(R2-nr2) (d) 4πT(nr 2 + R2) Ans.a (5)

2. The potential energy of a molecule on the surface of liquid compared to one inside the liquid is

(a)  Zero (b)  Smaller (c)   The same (d)  Greater Ans. d (9)

3. Two droplets merge with each other and forms a large droplet. In this process

(a)  Energy is liberated (b)  Energy is absorbed (c)   Neither liberated nor absorbed (d)  Some mass is converted into energy...

4. A drop of liquid of diameter 2.8 mm breaks up into 125 identical drops. The change in energy is nearly (S.T. of liquid =75 dynes/cm)

(a)  Zero (b)  19 erg (c)   46 erg (d)  74 erg Ans. d (4)

20. Two solids A and B float in water. It is observed that A floats with 1/2 of its body immersed in water and B floats with 1/4 of its volume above the water level. The ratio of the density of A to that of B is

(a)    4 : 3                               ...

19. A ball whose density is

0.4 × 103 kg/m3 falls into water from a height of 9 cm . To what depth does the ball...

17. A hollow sphere of volume V is floating on water surface with half immersed in it. What should be the minimum volume of water poured inside the sphere so that the sphere now sinks into the water

(a)   v/2                                     ...

16. If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is

(a)  Acute angle (b)  Obtuse angle (c)  90° (d)  0° Ans. (d) Tangent drawn at point of contact makes 0°...

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

(a)  Water and glass; glass and mercury (b) Pure water and glass; glass and alcohol (c)   Silver and water; mercury...

14. What is the shape when a non-wetting liquid is placed in a capillary tube

(a)  Concave upward (b)  Convex upward (c)  Concave downward (d)  Convex downward Ans. (b) Since for such liquid (Non-wetting) angle...

13. A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

(a)  Flat (b)  Concave (c)   Convex (d)  Cylindrical Ans. b (7)

12. Nature of meniscus for liquid

of 00 angle of contact (a)  Plane (b)  Parabolic (c)  Semi-spherical (d) Cylindrical   Ans. c (11)

11. The value of contact angle for kerosene with solid surface.

(a)  0° (b) 900 (c)  450 (d) 330 Ans. a (35)

9. The liquid meniscus in capillary tube will be convex, if the angle of contact is

(a)  Greater than (b)  Less than 90° (c)   Equal to 90°                                 (d)  Equal to 0° Ans. a (4)

8. 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

(a)   Increase (b)  Remain unchanged (c)   Increase or decrease (d)   Decrease Ans. b (7)

20. A triangular lamina of area A and height h is immersed in a liquid of density

ρ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is...

24. With rise in temperature, density of a given body changes according to one of the following relations

(a)    ρ= ρ0 [1+ (λd θ)]                       (b)  ρ= ρ0 [1- (λd...

5. The excess pressure due to surface tension in a spherical liquid drop of radius r is directly proportional to

(a)  r (b) r2 (c)     r-1 (d) r-2 Ans. c (8)

23. The density

ρ of water of bulk modulus B at a depth y in the ocean is related to the density at surface...

4. When two soap bubbles of radius

r1 and r2(r2>r1) coalesce, the radius of curvature of common surface is (a)    r2-r1 (b)  r2-r1/r1r2 (c)  r1r2/ r2-r1 (d)...

22. If two liquids of same volume but different densities

ρ1 and ρ2 are mixed, then density of mixture is given by (a) ρ=  (ρ1 +  ρ2) /2       ...

3. The surface tension of soap solution is

25 x 10-3 Nm-1 .  The excess pressure inside a soap bubble of diameter 1 cm is            (a)   10...

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

(a) 100 dyne/cm (b) 68.66 dyne/cm (c)  137  dyne/cm (d) 150 dyne/cm Ans. b (51)

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