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June 2022

Home2022JunePage 11

34. The relative lowering of the vapour pressure is equal to the ration between the number of

a. Solute molecules and solvent molecules b. Solute molecules and the total molecules in the solution c. Solvent molecules and...

Assertion : Funaria is monoecious. Reason : Cross fertilization occurs in Funaria.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Gemmae formation in Funaria occurs in favourable condition. Reason : The gemmae form on the stem and leaves.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Funaria multiplied vegetatively by means of bulbils. Reason : Bulbils and tubers are two different structures.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

32. An aqueous solution of methanol in water has vapour pressure

a. Equal to that of water b. Equal to that of methanol c. More than that of water d. Less...

19. The stress-strain curves for brass, steel and rubber are shown in the figure. The lines A, B and C are for

(a)  Rubber, brass and steel respectively (b)   Brass, steel and rubber respectively (c)   Steel, brass and rubber respectively (d)  Steel,...

18. The points of maximum and minimum attraction in the curve between potential energy (U) and distance (r)of a diatomic molecules are respectively

(a)   Sand R (b)   T and S (c)   R and S (d)   S and T Answer-d (34)

27. Vapour pressure of a solution of 5g of non – electrolyte in 100 g of water at a particular temperature is

2985 N / m2 . The vapour pressure of pure water is 3000 N/ m2 . The molecular weight of...

14. The diagram shows stress v/s strain curve for the materials A and B. From the curves we infer that

(a)   A is brittle but B is ductile              (b)   A is ductile and B is brittle (c)   Both A...

8. Two capillaries made of same material but of different radii are dipped in a liquid. The rise of liquid in one capillary is 2.2 cm and that in the other is 6.6 cm. The ratio of their radii is

(a)  9 : 1 (b)  1 : 9 (c)   3 : 1 (d)  1 : 3 Ans. c (12)

7. Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

(a)  2 : 3 (b)  3 : 2 (c)   3 : 4 (d)  4 : 3 Ans. b (12)

47. Which of the following statement about the composition of the vapour of over an ideal 1:1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at

25 ° C .(Given : Vapour pressure Date at 25 ° C   benzene = 12.8 κPa, Toluene = 3.85 κPa )...

Assertion : Sporophytes of pteridophyta are dominant individual. Reason : They do not show the formation of true root.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

46. For a dilute solution containing 2.5 g of a non volatile non electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is

2  ° C . Assuming concentration of solute is much lower than the concentration of solution is a. 724 b. 740...

Assertion : Water is not required for fertilization process in ferns. Reason : Malic acid of archegonial neck attracts antherozoids.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

45. Vapour pressure increases with increase in

a. Concentration of solution containing non-volatile solute b. Temperature upto boiling point c. Temperature upto triple point d. Altitude of...

Assertion : Both bryophytes and pteridophytes contain well-developed antheridia. Reason : Biflagellate sperms are formed by their antheridia.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

43. If two substance A and B have

PA o  : PB o  = 1 : 2  and have mole fraction in solution 1: 2 then mole fraction of A...

Assertion : Indusium dries in mature sours and releases sporangia. Reason : Mature sporangium releases spores by the structures-annulus and stomium.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

1. If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

(a)  10 m                                                (b)   20 m (c)   60 m                       ...

Assertion : Ramenta are scales which cover young rhizome and leaves of Dryopteris. Reason : Pteridium lacks rementa.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

42. At

80° C the vapour pressure of pure liquid ‘A’ is 520 mmHg and that of pure liquid ‘B’ is 1000...

Assertion : The sorus of pteridium is of coenosorus type. Reason : Pteridium lacks sori.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Mosses are used as pollution indicators. Reason : They absorb metals.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The archegonia of Funaria are arranged into a terminal cluster. Reason : The archegonial cluster is surrounded by perigonial leaves

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

37. The vapour pressure lowering caused by the addition of 100 g of sucrose to 100 gof water if the vapour pressure of pure water at

25 C is 23. 8 mm Hg a. 1.25 mm Hg b. 0.125 mm Hg c. 1.15 mm Hg d....

Assertion : Paraphyses are also called perigonial leaves. Reason : They are associated with the antheridia.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

36. A solution has a 1 : 4 mole ration of pentane to hexane. The vapour pressure of the pure hydrocarbons at

20° C are 440 mmHg for pentane and 120 mmHg for hexane. The mole fraction of pentane in the vapour...

Assertion : Antheridia of Funaria are sunk in pit. Reason : Its antheridial cluster is surrounded by perigonial leaves.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

33. Which solution will show the maximum vapour pressure at 300 K

a. 1 M C12 H22 O11 b. 1 M CH3 COOH c. 1 M CaCl 2 d. 1 M NaCl Ans....

31. Two beaker of capacity 500 mL were taken. One of these beaker, labelled as “A” was filled with 400 mL water whereas the beaker labelled “B” was filled with 400 mL of 2 M solution of NaCl. At the same temperature both the beakers were placed inn closed containers of same material and same capacity as shown in figure

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that...

17. A student plots a graph from his reading on the determination of Young’s modulus of a metal wire but forgets to label. The quantities on X and Y axes may be respectively

(a)  Weight hung and length increased (b)   Stress applied and length increased (c)   Stress applied and strain developed (d)   Length...

30. The boiling point of a solution of 0.11 g of a substance in 15g of ether was found to be

0.1 °C  higher than that of the pure ether. The molecular weight of the substance will be be a. 148...

16. The diagram shows the change x in the length of a thin uniform wire caused by the application of stress F at two different temperatures

16. The diagram shows the change x in the length of a thin uniform wire caused by the application of...

29. Equal weight of

CH4  and H2  are mixed in an empty container at 25° C. The fraction of the total pressure exerted by ...

28. A solution is obtained by dissolving 12 g of urea in a litre of water. Another solutiono is obtained by dissolving 68.4 g of cane- suger in a litre of water at the same temperature. The lowering of vapour pressure in the first solution is

a. Same as that of 2nd   solution b. Nearly one fifth of the  2nd solution c. Double that of 2nd ...

15. Which one of the following is the Young’s modulus (in N/m2) for the wire having the stress-strain curve shown in the figure

(a)  9×1011 (b)  8×1011 (c) 10×1011 (d)  2×1011 Answer-d       (11)

26. For a non volatile solute

a. Vapour pressure of solute is zero b. Vapour pressure of solvent is zero c. Vapour pressure of solution is...

25. If

Po and P are the vapour pressure of the pure solvent and solution and n1  and n2 are the moles...

24. The vapour pressure of acetone at

20° C is 185 torr. When 1.2 g of a non volatile substance was dissolved in 100 g of acetone...

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