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June 2022

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41. An L-shaped glass tube is just immersed in flowing water such that its opening is pointing against flowing water. If the speed of water current is v, then

(a)   The water in the tube rises to height v2 /2g (b)  The water in the tube rises to height ...

40. Fig. represents vertical sections of four wings moving horizontally in air. In which case the force is upwards

Answer-a (31)

39. An L-shaped tube with a small orifice is held in a water stream as shown in fig. The upper end of the tube is 10.6 cm above the surface of water. What will be the height of the jet of water coming from the orifice? Velocity of water stream is 2.45 m/s

(a)   Zero (b)  20.0 cm (c)   10.6 cm  (d)  40.0 cm Answer-b (10)

38. sniper fires a rifle bullet into a gasoline tank making a hole 53.0 m below the surface of gasoline. The tank was sealed at 3.10 atm. The stored gasoline has a density of

660 kgm–3. The velocity with which gasoline begins to shoot out of the hole is (a)  27.8 m/s     ...

37. A liquid flows through a horizontal tube. The velocities of the liquid in the two sections, which have areas of cross-section

A1 and A2 , are v1 and v2  The difference in the levels of the liquid in the two vertical...

36. In this figure, an ideal liquid flows through the tube, which is of uniform cross-section. The liquid has velocities

vA and vB , and pressure PA and PB at points A and B respectively (a) vA = vB (b)...

34. At what speed the velocity head of a stream of water be equal to 40 cm of Hg

(a)   282.8 cm/sec                     (b)  432.6 cm/sec (c)   632.6 cm/sec                     (d)  832.6 cm/sec Answer-a (11)

35. The weight of an aeroplane flying in air is balanced by

(a)   Upthrust of the air which will be equal to the weight of the air having the same volume as...

33. According to Bernoulli’s equation

[P/(ρg)]+ h + (1/2)(v2/g) The terms A, B and C are generally called respectively: (a)   Gravitational head, pressure head and...

32. The pans of a physical balance are in equilibrium. Air is blown under the right hand pan; then the right hand pan will

(a)   Move up (b)  Move down (c)   Move erratically (d)  Remain at the same level Answer-b (75)

31. The Working of an atomizer depends upon

(a)   Bernoulli’s theorem          (b)  Boyle’s law (c)   Archimedes principle       (d)  Newton’s law of motion Answer-a (15)

30. An application of Bernoulli’s equation for fluid flow is found in

(a)   Dynamic lift of an aeroplane (b)  Viscosity meter (c)   Capillary rise (d)  Hydraulic press Answer-a (11)

29. In a streamline flow

(a)   The speed of a particle always remains same (b)  The velocity of a particle always remains same (c)   The...

41. If molecular weight of compound is increased then sensitivity is decreased in which of the following methods

a. Elevation in boiling point b. Viscosity c. Osmosis d. Dialysis Ans. d   (11)

28. A liquid flows in a tube from left to right as shown in figure.

 A1 and A2   are the cross-sections of the portions of the tube as shown. Then the ratio of speeds v1 /...

40. Solution A contains 7 g/L of

MgCl2  and solution B contains 7 g/L of NaCl. At room temperature, the osmotic pressure of a. Solutions A is...

39. At low concentrations the statement that equimolal solutions under a given set of experimental conditions have equal osmotic pressure is ture for

a. All solutions b. Solutions of non-electrolytes only c. Solutions of electrolytes only d. None of these Ans. b Explanation...

38. Which of the following associated with isotonic solutions, is not correct

a. They will have the same osmotic pressure b. They have the same weight concentrations c. Osmosis does not take...

37. Osmotic pressure of a solution can be measured quickly and accurately by

a. Berkeley and Hartley’s method b. Morse’s method c. Pfeffer’s method d. De Vries method Ans. a (13)

36. Which inorganic precipitate acts as semipermeable membrane.

a. Calcium sulphate b. Barium oxalate c. Nickel phosphate d. Copper ferrocyanide Ans.d Explanation : Copper ferrocyanide ppt. acts as...

27. Water is flowing through a horizontal pipe of non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have

(a)   Maximum speed and least pressure (b)  Maximum pressure and least speed (c)   Both pressure and speed maximum (d)  Both...

26. Water is flowing through a tube of non-uniform cross-section ratio of the radius at entry and exit end of the pipe is 3 : 2. Then the ratio of velocities at entry and exit of liquid is

(a)   4 : 9                                     (b)  9 : 4 (c)   8 : 27                                  (d)  1 : 1 Answer-a (13)

34. The osmotic pressure of 0.4 % urea solution is 1.66 atm and that of a solution of sugar of 3.42 % is 2.46 atm. When equal volume of both the solution are mixed then the osmotic pressure of the resultant solution will be

a. 1. 64 atm b. 2.46 atm c. 2.06 atm d. 0.82 atm Ans. c (16)

25. The Reynolds number of a flow is the ratio of

(a)  Gravity to viscous force (b)  Gravity force to pressure force (c)   Inertia forces to viscous force (d)  Viscous forces...

23. In a laminar flow the velocity of the liquid in contact with the walls of the tube is

(a)  Zero (b)  Maximum (c)   In between zero and maximum (d)  Equal to critical velocity Answer-a (6)

31. An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because

a. It gains water due to osmosis b. It loses water due to reverse osmosis c. It gains water due...

22. We have two (narrow) capillary tubes

T1 and T2. Their lengths are l1 and l2 and radii of cross-section are r1 and r2 The rate of...

30. The empirical formula of a non-electroyte is

CH2 O . A solution containing 6g of the compound exerts the same osmotic pressure as that of 0.05 M...

29. A solution containing 10g per

dm3 of urea (molecular mass = 60 gmol-1 ) is isotonic with a 5% solution of a non volatile solute. The molecular...

28. Osmotic pressure of the solution can be increased by

a. increasing the temperature of the solution b. Decreasing the temperature of the solution c. Increasing the volume of the...

27. Desalination of sea water can be done by

a. Osmosis b. Reverse osmosis c. Filtration d. Diffusion Ans. b (11)

26. For gettting accurate value of molar mass of a solute by osmotic pressure measurement

a. The solute must be volatile b. The solution concentration must be high c. The solute  should undergo dissociation d....

3. The osmotic pressure of a 5% (wt/vol) solution of cane sugar at

150 ° C is a. 2.45 atm b. 5.078 atm c. 3.4 atm d. 4 atm Ans. b (35)

24. The work done in blowing a soap bubble of 10 cm

radius is (Surface tension of the soap solution is (3/100) N/m) (a)   75.36 x 10-4 joule (b) 37.68 x 10-4...

7. Which one of the following mixtures can be separated into pure components by fractional distillation

a. Benzene – toluene b. Water – ethyl alcohol c. Water – nitric acid d. Water – hydrochloric acid Ans....

23. The amount of work done in forming a soap film of

size 10 cm x 10 cm is (Surface tension T= 3 x 10-2 Nm (a)6 x 10-4 j                                     (b)...

5. Which will form maximum boiling point azeotrope

a. HNO3  +  H2 O  solution b.  C2 H5 OH + H2  O solution c. C6 H6  + C6 H5 ...

4. A mixture of two completely miscible non-ideal liquids which distil as such without change in its composition at a constant temperature as thought it were a pure liquid. This mixture is known as

a. Binary liquid mixture b. Axzeotropic mixture c. Eutectic mixture d. Ideal mixture Ans. b (8)

2. An azeotropic solution of two liquids has boiling point lower then either when it

a. Shows a negative deviation from Raoult’s law b. Shows no deviation from Raoult’s law c. Shows positive deviation from...

18. A mercury drop of 1 cm radius is broken into

106 small drops. The energy used will be (surface tension of mercury is 35 x10-3N/cm (a) 4.4 x 10-3 j...

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