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June 2022

Home2022JunePage 18

26. When load of 5kg is hung on a wire then extension of 3m takes place, then work done will be

(a)   75 joule                                  (b)   60 joule (c)   50 joule                                  (d)   100 joule Answer-a (7)

6. To prepare a solution of concentration of 0.03 g/mL of

AgNO3  what amount of AgNO3  should be added in 60 mL of solution a. 1.8 b. 0.8 c. 0.18 d....

25. The work per unit volume to stretch the length by 1% of a wire with cross sectional area of 

25. The work per unit volume to stretch the length by 1% of a wire with cross sectional area of ...

5. 10. 6 grams of a substance of molecular weight 106 was dissolved in 100 mL. 10mL of this solution was pipetted out into a 1000mL flask and macle up to the mark with distilled water. The molarity of the resulting solution is

a.  1.0 M b. 10-2 M c. 10-3 M d. 10 -4  M Ans. b (4)

24. On mixing the salt in water, the surface tension of water will

(a)  Increase (b)  Decrease (c)   Remain unchanged (d)  None of the above Ans. a (43)

24.A wire of length 50 cm and cross sectional area of 1 sq. mm is extended by 1 mm. The required work will be

24.A wire of length 50 cm and cross sectional area of 1 sq. mm is extended by 1 mm. The...

23. If two glass plates are quite nearer to each other in water, then there will be force of

(a)  Attraction (b) Repulsion (c)   Attraction or repulsion (d) None of the above Ans. a (3)

20.K is the force constant of a spring. The work done in increasing its extension from

20.K is the force constant of a spring. The work done in increasing its extension from l1 to l2 will...

16. Water does not wet an oily glass because

(a)  Cohesive force of oil>> adhesive force between oil and glass (b)  Cohesive force of oil > cohesive force of...

15. A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

(a)   2 TL (b)  4 TL (c)   8 TL (d)  10 TL Ans. (c) Force on each side =2TL (due...

19.When a force is applied on a wire of uniform cross-sectional area

19.When a force is applied on a wire of uniform cross-sectional area 3×10-6 m2 and length 4m, the increase in...

4. Two solutions of a substance are mixed in the following manner 480mL of 1.5M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture

a. 1.20 M b. 1.50M c. 1.344 M d. 2.70 M Ans. c (19)

22. The surface tension of a liquid

(a) Increases with area (b)  Decreases with area (c)   Increase with temperature (d)  Decrease with temperature Ans. d (8)

3. The Molarity of a solution made by mixing 50mL of conc.

H2 SO4 (36N) with 50mL of water is a. 36M b. 18M c. 9M d. 6M Ans. c Explanation :...

21. The property of surface tension is obtained in

(a)  Solids, liquids and gases (b)  Liquids (c)   Gases (d)  Matter Ans. b (8)

2. What will be the molarity of a solution containing 5g of sodium hydroxide in 250mL solution.

a. 0.5 b. 1.0 c. 2.0 d. 0.1 Ans. a (9)

1. The amount of anhydrous

Na2 CO3  present in 250 mL of 0.25 M solution is a. 6.225g b. 66.25 g c. 6.0 g d....

20. Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is

(a)   30  dynes (b)  60 dynes (c)   750 dynes (d)  750 π dynes Ans. d (47)

23. The elastic energy stored in a wire of Young’s modulus Y is

(a)   Y×(Strain2/Volume) (b)   Stress × Strain × Volume (c)  (Stress2×Volume) / (2Y) (d)  (1/Y) × Stress × Strain × Volume Answer-c (12)

19. In the glass capillary tube, the shape of the surface of the liquid depends upon

(a)  Only on the cohesive force of liquid molecules (b)  Only on the adhesive force between the molecules of glass...

18. Which of the fact is not due to surface tension

(a)  Dancing of a camphor piece over the surface of water (b)  Small mercury drop itself becomes spherical (c)   A...

22. A wire of length L and cross-sectional area A is made of a material of Young’s modulus Y. It is stretched by an amount x. The work done is

(a) (YxA)/(2L)                                     ...

25. For the solution of the gases w,x,y and z in water at 298K, the Henrys law constants are 0.5, 2, 35 and 40K bar respectively . The correct plot for the given data is

Answer. C (45)

17. A water drop takes the shape of a sphere in a oil while the oil drop spreads in water, because

(a) C.F. for water > A.F. for water and oil (b) C.F. for oil > A.F. for water and oil (c)  C.F. for...

21. When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches by 2 cms. The work required to be done by an external agent in stretching this spring by 5 cms will be

21. When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches...

23. The variation of solubility of four different gases (G1, G2. etc) in a given solvent with pressure at a constant temperature is shown in the plot

The gas with the highest value of Hnery’s law constant is a. G4 b. G2 c. G3 d. G1 Ans....

14. Hairs of shaving brush cling together when it is removed from water due to

(a)  Force of attraction between hair (b)  Surface tension (c)   Viscosity of water (d)  Characteristic property of hairs Ans. b...

7. Coatings used on raincoat are waterproof because

(a)  water is absorbed by the coating (b)  Cohesive force becomes greater (c)   Water is not scattered away by the...

6. A pin or a needle floats on the surface of water, the reason for this is

(a)  Surface tension (b)  Less weight (c)   Upthrust of liquid (d)  None of the above Ans. a (13)

19. Which of the following is not correct for

D2  O a. Boiling point is higher than H2 O b. D2 O reacts slowly than H2 O c. Viscosity...

20. Which one of the following gases has the lowest value of Henry’s law constant

a. N2 b. He c. H2 d. CO2 e. O2 Ans. d Explanation : As the solubility increases value of...

18. On stretching a wire, the elastic energy stored per unit volume is

(a)  Fl/2AL                                     ...

22. The solubility curve of

KNO3  in water is shown below The amount of KNO3  that dissolves in 50g of water at 40° C is...

13. Small droplets of a liquid are usually more spherical in shape than larger drops of the same liquid because

(a)  Force of surface tension is equal and opposite to the force of gravity (b)  Force of surface tension predominates...

17. If a spring extends by x on loading, then the energy stored by the spring is (if T is tension in the spring and k is spring constant)

(a)    T2/2x                                   ...

12. The spiders and insects move and run about on the surface of water without sinking because

(a)   Elastic membrane is formed on water due to property of surface tension (b)  Spiders and insects are lighter (c)   Spiders...

11. A small air bubble is at the inner surface of the bottom of a beaker filled with cold water. Now water of the beaker is heated. The size of bubble increases. The reason for this may be

(a)  Increase in the saturated vapour pressure of water (b)  Root mean square velocity of air molecules inside the bubble...

11.

KH  value fro Ar(g), CO2 (g), HCHO (g) and CH4  (g) are 40.39 , 1.67, 1.83 x 10-5  and 0.413 respectively...

10. The temperature at which the surface tension of water is zero

(a)  0°C (b)  277 K (c)   370°C (d)  Slightly less than 647 K Ans. c,d (14)

24. Which one of the following statements regarding Henry’s law is not correct

a. Different gases have different KH  values at the same tempertaure. b. The value of KH    increases with increases of...

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