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June 2022

Home2022JunePage 5

25. A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is σ, then change in surface energy is

(a) π D2 σ (b) 2 π D2 σ (c) 3 π D2 σ (d) 4 π D2 σ Ans....

8. If two liquids A and B form minimum boiling azeotrope at some specific composition then

a. A – B interactions are stronger than those between A – A or B- B b. Vapour pressure of...

20. Surface tension of a soap solution

is 1.9 x 10-2N/m . Work done in blowing a bubble of 2.0 cm diameter will be (a)  7.6 x...

20. The rate of steady volume flow of water through a capillary tube of length ‘l’ and radius ‘r’ under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)

(a)   V/16                                     (b) ...

19. A ball of radius r and density ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is η, the value of h is given by

(a)  (2/9)r2[(1- ρ)/η]g (b)    (2/81)r2[(ρ- 1)/η]g (c)    (2/81)r4[(ρ- 1)/η]2 g (d)    (2/9)r4[(ρ- 1)/η]2 g Answer-c (8)

22. At temperature

327° C and concentraiton C osmotic pressure of a solution is P, the same solutions at concentration C/2 and a...

24. For an ideal solution, the correct options is

a. Δmix  G = 0 at constant T and P b. Δmix  S = 0 at constant T and P...

3. A liquid mixture boils without changing constituent is called

a. Stable structure complex b. Binary liquid mixture c. Zeotropic liquid mixture d.Azeotropic liquid mixture Ans. d Explanation : Azeotropic ...

1. Osmotic pressure is 0.0821 atm at temperature of 300 K. Find concentration in mole/L

a. 0.033 b. 0.066 c. 0.33 x 10-2 d. 3 Ans. c (11)

27. The work done in increasing the size of a soap film from

10 cm× 6 cm to 10 cm × 11 cm is 3 ×10-4 joule. The surface tension of the film...

9. On the basis of information given below mark the correct option

Information : On adding acetone to methanol some of the hydrogen bonds between methanol molecules break a. At specific composition...

20. When two liquid A and B are mixed then their boiling points becomes greater than of them. What is the nature of this solution

a. Ideal solution b. Positive deviation with non ideal solution c. Negative devitation with non ideal solution d. Normal solution...

6. On the basis of information given below mark the correct option

Information : i. In bromoethane and chloro ethane mixture inter-molecular interaction of A – A and B- B type are...

18. A rectangular block is 5 cm × 5 cm × 10cm in size. The block is floating in water with 5 cm side vertical. If it floats with 10 cm side vertical, what change will occur in the level of water?

(a)  No change (b)   It will rise (c)   It will fall (d)   It may rise or fall depending on the...

6. A liquid is coming out from a vertical tube. The relation between the weight of the drop W, surface tension of the liquid T and radius of the tube r is given by, if the angle of contact is zero

(a)  w= πr2T (b) w= 2πrT (c)w= 2πr2T (d) w= (3/4)πr3 T Ans. b (5)

7. The parts of motor cars are polished by chromium because the angle of contact between water and chromium is

(a)      0o      (b)   90o (c)   Less than 90o                               (d)  Greater than 90o Ans. d (5)

7. Which of the following liquid pairs shows a positive deviation from Raoult’s law

a. Water-nitric acid b. Benzene- method c. Water-hydrochloric acid d. Acetone chloroform Ans. b (10)

15. Which one is not equal to zero for an ideal solution

a.  ΔS mix b. ΔV mix c ΔP = PObserved      – P Raoult d. ΔH mix Answer : a...

14. Which of the following is not for ideal solution

a. ΔS mix    = 0 b. ΔH mix  = 0 c. It obeys Raoult’s law d.  ΔV mix   = 0 ANSWER...

13. Liquids A and B form and ideal solution

a. The enthalpy of mixing is zero b. The entropy of mixing is zero c. The free energy of mixing...

12. Which property is shown by an ideal solution

a. It follows Raoult’s law b.  ΔHmix  = 0 c.  Δ Vmix  = 0 d.  All of these ANSWER :...

11. All form ideal solution except

a.  C2 H5 Br and C2 H5 I b.  C6 H5 Cl  and C6  H5Br c.  C6 H6  and  C6...

17. A small sphere of mass m is dropped from a great height. After it has fallen 100 m, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is

(a) Greater than the work done by air friction in the second 100 m (b)  Less than the work done...

16. Spherical balls of radius ‘r’ are falling in a viscous fluid of viscosity

‘η‘ with a velocity ‘v‘. The retarding viscous force acting on the spherical ball is (a) Inversely proportional to ‘r‘...

10. Which of the following does not show negative deviation from Raoult’s law

a. Acetone-Chloroform b. Acetone Benzene c. Chloroform Ether d. Chloroform Benzene ANSWER : B (48)

9. Which of the following does not show positive deviation from Raoult’s law

a. Benzene- Chloroform b. Benzene Acetone c. Benzene Ethanol d.Benzene Carbon tetrachloride ANSWER : A Explanation : Benzene  chloroform solution...

15. A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is

(a)  0.1                                     ...

8. Identify the mixture that shows positive deviation from Raoult’s law a

a. CHCl3  + (CH3 )2  CO b. (CH3 )2  CO +  C6 H5 NH2 c. CHCl3  + C6 H6 d.(CH3 )2 ...

13. A cylindrical tank has a hole of 1 cm2 in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of

70 cm3/sec. then the maximum height up to which water can rise in the tank is (a)   2.5 cm                                        (b) ...

13. There is a hole of area A at the bottom of cylindrical vessel. Water is filled up to a height h and water flows out in t second. If water is filled to a height 4h, it will flow out in time equal to

(a)   t                                     ...

12. There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm

(1 atm = 105N/m2) then the velocity of water flowing from hole is (a)  √400 m/s            ...

11. A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is

(a)      10                                  (b)  20...

5. Considering the formation breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law

a. Methanol and acetone b. Chloroform and acetone c.Nitric acid and water d. Phenol and aniline ANSWER . A Explanation...

4. One component of a solution follows Raoult ‘s law over the entire range 0

≤ x1 ≤ 1. The second component must follow Raoult’s law in the range when x2  is a. Close to...

10. A large tank filled with water to a height ‘h’ is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to h/2 and from h/2 to zero is

(a) √2                                  (b) 1/...

8. A manometer connected to a closed tap reads

3.5 × 105 N/m2. When the valve is opened, the reading of manometer falls to 3.0 × 105 N/m2, then...

10. The radius of a soap bubble is increased

from (1/√π) cm to (2/√π) cm. If the surface tension of water is 30 dynes per cm, then the work done...

5. Water is moving with a speed of

5.18 ms–1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the...

5. 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

(a)    4πr2T (b) 2 πr2T (c) 12 πr2T (d) 24 πr2T Ans. d (54)

3. A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution

a. The solution formed is an ideal solution b. The solution is non-ideal showing +ve  deviation from Raoult’s Law c....
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