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7. The stress versus strain graphs for wires of two materials A and B are as shown in the figure.

The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If Y1 and Y2 are the Young ‘s modulii of the materials, then (a) YB = 2YA (b) YA …

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’ in vapour phase; yN = Mole fraction of ‘N’ in vapour phase) a. xM/xN < yM / yN b. (yM – yM ) …

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 (b) Ans.a (6)

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 (13)

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. The solution having a higher freezing point than the solvent d. The solution having a lower osmotic pressure than the …

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

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 (9)

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 (36)

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

3. In the above graph, point B indicates

(a) Breaking point (b) Limiting point (c) Yield point (d) None of the above Answer-c (12)

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

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 (8)

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

Ans. b (7)

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

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 (17)

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 (d) Mass of the pan was neglected Answer-d (5)

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

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 (12)

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

Ans. b (14)

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

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

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.

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

63. NaClO solution reacts with

H2 SO 3 as, NaClO + H2SO 3 → NaCl + H2 SO4 . A solution of NaClO used in the above reaction contained 15 g of NaClO per litre. The normality of the solution would be a. 0.8 b. …