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June 2022

Home2022JunePage 13

10. Liquid ‘M’ and liquid ‘N’ form an ideal solution. The vapour pressure of pure liquids ‘M’ and ‘N’ are 450 and 700 mmHg, respectively at the same temperature. Then correct statement is

( x M  = Mole fraction of ‘M’ in solution; xN = Mole fraction of ‘N’ in solution; yM  = Mole fraction of ‘M’...

8. Colligative properties are used for the determination of

a. Molar Mass b. Equivalent weight c. Arrangement of molecules d. Melting point and boiling point e. Both (a) and...

6. At 300 K, when a solute is added to a solvent its vapour pressure over the mercury reduces from 50 mm to 45 mm. The value of mole fraction of solute will be

a.  0.005 b. 0.010 c. 0.100 d. 0.900 Ans. c   (16)

9. Whe n a substance is dissolved in a solvent, the vapour pressure of the solvent is decreased.. This results in

a. An increase in the boiling point of the solution b. a decrease in the boiling point of solvent c....

Assertion : Paroicous mosses have both sex organs intermingled together. Reason : Autoicous mosses bear sex organs on different branches.

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

2. Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

5. A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290mm at 300 K. The vapour pressure of propyl is 0.6 it vapour pressure at the same temperature will be

a. 350 b. 300 c. 700 d. 360 Ans. a (11)

4. Which of the following aqueous solutions has the highest boiling point

a. 0.1 M KNO3 b. 0.1 M Na3  PO4  c. 0.1 M BaCl2 d. 0.1 M K2 SO4 Ans. b...

22. Assertion : Unlike thallophytes, bryophytes show formation of embryo. Reason : The embryo gives rise to gametophyte plant of bryophytes.

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

3. In the above graph, point B indicates

(a) Breaking point                             (b)   Limiting point (c)   Yield point                       ...

32. Assertion : The young stem of Funaria is photosynthetic. Reason : It contain hydroids.

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

2. A graph is shown between stress and strain for a metal. The part in which Hooke’s law holds good is

(a)  OA                (b)   AB (c)   BC                                                         (d)   CD Answer-a (12)

3. Which graph represents the variation of surface tension with temperature over small temperature ranges for water

Ans. b (8)

Assertion : The sporogonium of Riccia is the simplest among the liverworts. Reason : Sporophyte consists of capsule only

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

10. “Relative lowering in vapour pressure of solution containing non-volatile solute is directly proportional to mole fraction of solute”. Above statement is

a. Henry law b. Dulong and petit law c. Raoult’s law d. Le – Chatelier’s principle Ans. c (21)

1. The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the

(a)  Spring did not obey Hooke’s Law (b)   Amplitude of the oscillations was too large (c)   Clock used needed regulating...

Assertion : Sperms of Riccia are biflagellate. Reason : Sperms show swimming nature.

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

2. A soap bubble is blown with the help of a mechanical pump at the mouth of a tube. The pump produces a certain increase per minute in the volume of the bubble, irrespective of its internal pressure. The graph between the pressure inside the soap bubble and time t will be-

Ans. a (15)

1. The correct curve between the height or depression h of liquid in a capillary tube and its radius is

Ans. b (17)

Assertion : The primary protonema of moss by death and decay of cells may break into fragments. Reason : Each fragment gives rise to leafy gametophyte.

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

12. Assertion : Sterss is the internal force per unit area of a body. Reason : Rubber is less elastic than steel.

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

11. Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring. Reason : Steel is more elastic than copper.

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

Assertion : Sporogonium of Riccia is totally dependent on the gametophyte. Reason : Sporogonium of Marchantia is partly dependent on the gametophyte.

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

63. NaClO solution reacts with

H2 SO 3 as, NaClO + H2SO 3   → NaCl + H2 SO4 . A solution of NaClO used in...

77. The molality of 90%

H2 SO4 solution is a. 1.8 b. 48.4 c. 91.83 d. 94.6 Ans. c (8)

2. Which of the following is a colligative property

a. Osmotic pressure b. Boiling point c. vapour pressure d. Freezing point Ans. a (15)

Assertion : All bryophytes are land dwellers. Reason : Water is necessary to complete their life-cycle.

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

Assertion : Meiospores form genetically and functionally different progenies. Reason : Mitospores form progenies identical to parents.

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

4. Assertion : A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink. Reason : The buoyancy of an object depends both on the material and shape of the object.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

85. 4 L of 0.02 M aqueous solution of NaCl was diluted by adding 1 L of water. The molality of the resultant solution is

a. 0.004 b. 0.008 c. 0.012 d. 0.016 Ans. d (10)

Assertion : Spirogyra shows anisogamy. Reason : Gametes are identified on the basis of their motility.

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

84. Calculate the molality of a solution that contains 51.2g of nephthalene, in 500 mL of carbon tetrachloride. The density of

CCl4  of 1.60 g/ml a. 0.250 m b. 0.500 m c. 0.750 m d. 0.840 m e. 1.69 m Ans. b...

80. Density of a 2.05 M solution of acetic acid in water is 1.02 g/ml. The molality of the solution is

a. 1.14 mol kg -1 b. 3.28 mol kg -1 c. 2.28 mol kg -1 d.0.44 molkg -1 Ans. c (11)

Assertion : Spermatangium of red algae bears trichogyne. Reason : Trichogyne helps in reproduction.

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

79. Calculate the molaity of 1 litre solution of 93%

H 2 SO4 . The density of the solution is 1.84 g/ml a. 10.43 b. 20.36 c. 12.05 d. 14.05 Ans....

Assertion : Riccia is many cells thick. Reason : Riccia has both assimilatory region and storage region.

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

3. The colligative properties of a solution depend on

a. Nature of solute particles present in it b. Nature of solvent used c. Number of solute particles present in...

14. Assertion : The shape of a liquid drop is spherical. Reason : The pressure inside the drop is greater than that of outside.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

Assertion : Liverworts fail to spread to a new locality through fragmentation. Reason : Gemmae are helpful in propagating liverworts in different locality.

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

13. Assertion : Hot soup tastes better than the cold soup. Reason : Hot soup has high surface tension and it does not spread properly on our tongue.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

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