2022Flame Institute

10. The pressure at the bottom of a tank containing a liquid does not depend on

(a) Acceleration due to gravity (b) Height of the liquid column (c) Area of the bottom surface (d) Nature of the liquid Answer-c (8)

9. A body of density

d1 is counterpoised by of weights of density d2 in air of density d. Then the true mass of the body is (a) M …

7. Density of ice is

ρ and that of water is σ . What will be the decrease in volume when a mass M of ice melts (a) M/( σ – ρ ) …

29. Two capillary tubes of same diameter are put vertically one

each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50 dyne/cm respectively Ratio of heights of liquids in the two tubes h1/h2 is (a) 10/9 (b) 3/10 (c) 10/3 (d) 9/10 Ans. …

49. Normal boiling point of water is 373 . Vapour pressure of water at 298 K is 23 mm. if the enthalpy of evaporation is 40.656

κ J/mole, the boiling point of water at 23 mm pressure will be a. 250 K b. 294 K c. 51.6 K d. 12.5 K Ans.b (12)

53. Assertion : Gymnosperms seeds are naked. Reason : They lack ovary wall.

(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 …

4. A uniformly tapering vessel is filled with a liquid of density

900 kg/m3. The force that acts on the base of the vessel due to the liquid is(g=10 m/sec) (a) 3.6 N (b) 7.2 N (c) 9.0 N (d) 14.4 N Answer-b (83)

30. Water rises in a vertical capillary tube upto a height of 2.0 cm . If the tube is inclined at an angle of 60 degree with the vertical, then upto what length the water will rise in the tube

(a) 2.0 cm (b) 4.0 cm (c) 4/√3 cm (d) 2√2 cm Ans. b (4)

Assertion : Mosses are evolved from algae. Reason : Protonema of mosses is similar to some green algae.

Assertion : Pinus shows formation of annual rings. Reason : Pinus grows in area of environmental fluctuation

Assertion : Angiosperms and gymnosperms both are flowering plants. Reason : Both form seeds.

Assertion : Cedrus deodara yields highly-valued timber. Reason : Cedrus deodara is resistant to pathogen attack.

Assertion : Pinus displays the alternation of generations. Reason : The gametophyte is dependent upon the sporophyte phase.

Assertion : Pinus embryo has two cotyledons. Reason : Pinus shows polyembryony.

Assertion : The female cones take much time to mature. Reason : The seeds are shed when the cone is 22 months old.

Assertion : The female cones are same in number as male cones. Reason : Male and female cones appears alternately on the same branch of the Pinus.

Assertion : Male cone of Pinus is equivalent to stamens of angiosperms. Reason : Male cone bears pollen grains.

Assertion : Pinus is monoecious. Reason : Each sporophyll bears only one microsporangia.

Assertion : The mesophyll of Pinus shows no distinction as mesophyll and palisade. Reason : Parenchymatous cells are present in mesophyll of Pinus.

19. A capillary tube when immersed vertically in liquid records a rise of 3 cm. If the tube is immersed in the liquid at an angle of 60 degree with the vertical. The length of the liquid column along the tube is

(a) 9cm (b) 6cm (c) 3cm (d) 2cm Ans. b (63)

Assertion : The scale leaves on the long shoots are called cataphylls. Reason : Cataphylls lack mid rib.

17. If the surface tension of water

If the surface tension of water is 0.06 Nm-1, then the capillary rise in a tube of diameter 1 mm is (θ=0° ) (a) 1.22 cm (b) 2.44 cm (c) 3.12 cm (d) 3.86 cm Ans. b (11)

Assertion : In gymnosperms, plants show well-developed vessels and fibres. Reason : Companion cells are absent in gymnosperm.

Assertion : Pinus has a pyramidal appearance. Reason : The older parts of long shoot have scars of fallen dwarf shoots.

Assertion : The female cone of Cycas is not true cone. Reason : Its formation checks the growth of the stem.

Assertion : All living species of Cycas are dioecious. Reason : Cycas contains male and female cones on the same plant.

11. Water rises upto 10 cm height in a long capillary tube. If this tube is immersed in water so that the height above the water surface is only 8 cm, then

(a) Water flows out continuously from the upper end (b) Water rises upto upper end and forms a spherical surface (c) Water only rises upto 6 cm height (d) Water does not rise at all Ans. b (4)