2022Flame Institute

25. In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first, is

(a) 1.2 mm (b) 2.4 mm (c) 0.6 mm (d) 0.4 mm Ans. b (4)

16. If the diameter of a capillary tube is doubled, then the height of the liquid that will rise is

(a) Twice (b) Half (c) Same as earlier (d) None of these Ans. b (10)

Assertion : Adiantum caudatom is called walking fern. Reason : It can reproduce by its leaf tips.

(a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion …

24. A shell having a hole of radius r is dipped in water. It holds the water upto a depth of h then the value of r is

(a) r= 2T/hdg (b) r= T/hdg (c) r= Tg/hd (d) None of these Ans. a (7)

Assertion : Stamens are comparable to microsporophylls. Reason : Ovules are comparable to megasporophylls.

Assertion : More dicot species are known than that of monocot species. Reason : Two cotyledons are present in the dicot plants.

27. If liquid level falls in a capillary then radius of capillary will

(a) Increase (b) Decrease (c) Unchanged (d) None of these Ans. a (13)

Assertion : Biennial plants flower in two year. Reason : The biennial plants live for two years.

Assertion : Angiosperms contain microsporophyll and megasporophyll. Reason : Microsporophyll and megasporophyll forms microspore and megaspore respectively.

28. Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be

(a) 6h (b) 1/6 h (c) h (d) Zero Ans. a (56)

Assertion : Pinus is heterosporous. Reason : Microspore and megaspore are present in them.

Assertion : “Upper Carboniferous” period is also called “Age of Ferns”. Reason : Ferns dominated during the period.

15. By inserting a capillary tube upto a depth l in water, the water rises to a height h. If the lower end of the capillary is closed inside water and the capillary is taken out and closed end opened, to what height the water will remain in the tube

(a) Zero (b) l+h (c) 2h (d) h Ans. d (35)

Assertion : Cycas embryo has many cotyledons. Reason : Compound suspensor is formed due to fusion of suspensors of proembryos.

14. A capillary tube made of glass is dipped into mercury. Then

(a) Mercury rises in the capillary tube (b) Mercury rises and flows out of the capillary tube (c) Mercury descends in the capillary tube (d) Mercury neither rises nor descends in the capillary tube Ans. c (8)

Assertion : The interval between pollination and fertilization is about 4 months in Cycas. Reason : Cycas show retention of swimming sperm.

13. Water rises in a capillary tube when its one end is dipped vertically

Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75 × 10-3 N/m, then the diameter of capillary will be (a) 0.1 mm (b) …

Assertion : The male of Cycas change in size when the microspores became mature. Reason : The microspores are dispersed by wind.

52. When a liquid that is immiscible with was steam distilled at

95. 2 ° C at a total pressure of 99.652 KPa. The distillate contained 1.27 g of the liquid per gram of water. What will be the molar mass of the liquid if the vapour pressure of water is 85.140 …

12. A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is (S.T. of water =75 dyne/cm, g =1000 cm/s2)

(a) 100 cm (b) 75 cm (c) 50 cm (d) 30 cm Ans. d (42)

51. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to…..

a. Low temperature b. Low atmospheric pressure c. High atmospheric pressure d. Both low temperature and high atomospheric pressure Ans. b Explanation : Low concentration of oxygen in the blood and tissues of people living at high altitude is due …

Assertion : Xylem of gymnosperms consists of tracheids and no vessels. Reason : Phloem of gymnosperms consists of phloem parenchyma, companion cells and sieve tubes.

10. When a capillary is dipped in water, water rises to a height h . If the length of the capillary is made less than h , then

(a) The water will come out (b) The water will not come out (c) The water will not rise (d) The water will rise but less than height of capillary Ans. b (24)

Assertion : Cycas has two types of root-tap root system and coralloid roots. Reason : Coralloid root contains Anabaena.

50. Pick out the wrong statement (s)

1.. Vapour pressure of a liquid is the measure of the strengh of intermolecular attttactive forces 2. Surface tension of a liquid acts perpendicular to the surface of the liquid 3. Vapour pressure of all liquid is same at their …

9. Two capillaries made of the same material with

(a) 7.5 cm (b) 60 cm (c) 15 cm (d) 120 cm Ans. c (13)

4. In the above graph, point D indicates

(a) Limiting point (b) Yield point (c) Breaking point (d) None of the above Answer-c (6)

10. The graph is drawn between the applied force F and the strain (x) for a thin uniform wire. The wire behaves as a liquid in the part

(a) ab (b) bc (c) cd (d) oa Explanation- (b) At point b, yielding of material starts. (41)

4. Two parallel glass plates are dipped partly in the liquid of density ‘d’ keeping them vertical. If the distance between the plates is ‘x’, surface tension for liquids is T and angle of contact is θ, then rise of liquid between the plates due to capillary will be

(a) T cosθ/xd (b) 2T cosθ/xdg (c) 2T/xdg cosθ …

5. water rises in a capillary tube to a certain height such that the upward force due to surface

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75 X 10-4 N force due to the weight of the liquid. If the surface tension of water …

3. In the state of weightlessness, a capillary tube is dipped in water, then water

(a) Will not rise at all (b) Will rise to same height as at atmospheric pressure (c) Will rise to less height than at atmospheric pressure (d) Will rise up to the upper end of the capillary tube of any …

Assertion : In leptosporangiate development, sporangia are formed from a group of initials. Reason : Eusporangiate development of sporangia starts from single initial.

48. At

100° C the vapour pressure of a solution of 6.5g of a solute in 100 g water is 732mm. If Kb = 0.52; the boiling point of this solution will be a. 101 ° C b. 100 ° C c. 102 …

44. The mass of glucose that should be dissolved in 50 gof water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 gof urea in the same quantity of water is

a. 1 g b. 3g c. 6 g d. 18 g Ans. b (39)

Assertion : Coenosorus lacks true indusium. Reason : Indusium covers sori.

41. Which has miximum vapour pressure

a. HI b. HBr c. HCl d. HF Ans. c (12)

40. An ideal solution was obtained by mixing methanol and ethanol. if the partial vapour pressure of methanol and ethanol are 2.619

κPa and 4.556 κPa respectively, the composition of the vapour wll be a. 0.635 methanol, 0.365 ethanol b. 0.365 methanol, 0.635 ethanol c. 0.574 methanol, 0.326 ehanol d. 0.173 methanol, 0.827 Ans. b (50)

39. 18g of glucose is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at

100° C is a. 759.00 Torr b. 7. 60 Torr c. 76.00 Torr d. 752.40 Torr Ans. d (16)

38. Which of the following is incorrect

a. Relative lowering of vapour pressure is independent b. The vapour pressure is a colligative property c. Vapour pressure of a solution is lower than the vapour pressure of the solvent d. The relative lowering of vapour pressure is directly …