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June 2022

Home2022JunePage 9

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...

7. Density of ice is

ρ and that of water is σ . What will be the decrease in volume when a mass M of...

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...

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....

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...

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...

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 (5)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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 (71)

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

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

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...

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

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

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

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

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

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

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

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

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...

Assertion : Fertilized ovule forms seed. Reason : Ripened ovary forms fruit.

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

23. During capillary rise of a liquid in a capillary tube, the surface of contact that remains constant is of

(a)  Glass and liquid (b)  Air and glass (c)   Air and liquid (d)  All of Ans. c (12)

Assertion : Angiosperms are mostly terrestrial. Reason : Angiosperms are found in plains only.

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

Assertion : Pinus wood is used as fuel wood. Reason : Pinus wood can easily be ignited.

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

Assertion : In Pinus, pollination is anemophilous Reason : Pinus bear winged pollen grains.

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

20. The action of a nib split at the top is explained by

(a)  Gravity flow (b)  Diffusion of fluid (c)   Capillary action (d)  Osmosis of liquid Ans. c (17)

Assertion : Angiosperms are most recent plants. Reason : Angiosperms lack archegonia.

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

21. The correct relation is

(a)   r= 2T cos θ/hdg (b)  r= hdg/2T cos θ (c) r= 2T dgh/cos θ (d) r= T cos θ/2hdg...

Assertion : Double fertilization is unique to angiosperms. Reason : Triple fusion occurs in double fertilization.

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

cAssertion : Angiosperm and Gymnosperms both are spermatophyta. Reason : Angiosperm and Gymnosperms both form triploid endosperm.

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

22. Water rises upto a height h in a capillary on the surface of earth in stationary condition. Value of h increases if this tube is taken

(a)  On sun (b)  On poles (c)   In a lift going upward with acceleration (d)  In a lift going downward...

Assertion : Flower is aggregation of sporophylls. Reason : Sporophylls are modified in angiosperms

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

Assertion : Angiosperms lack flagellate male gametes. Reason : Sperms are not dependent on water for fertilization.

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

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 (7)
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