GUESS PAPER SUMMATIVE ASSESSMENT –I (2011) SCIENCE- Class – IX (Chemistry)

GUESS PAPER SUMMATIVE ASSESSMENT –I (2012)  Class – IX (Chemistry

Section A

1.What is dry ice ? What happens when the pressure under which it is stored is decreased to

1 atmosphere ?

2.Why is glass or chinaware packed with straw ?

3.Name the processes by which CO2 and H2O move into and out of the cell ?

4.List in tabular form any two differences between homogeneous and heterogeneous mixtures.

5. (a) Define evaporation.  (b) Explain how the following factors affect the rate of evaporation of a liquid:

(i) temperature of the liquid.                             (ii) area of the exposed surface.

(iii) moisture in the surrounding air.                  (iv) Increase in wind speed.

6.(i) Name the process or the separation technique you would follow to separate : (a) Dyes in black ink (b) Butter from cream (c) Ammonium chloride and common salt (d) Iron filings and sand (ii) State the principle used in separation by centrifugation.

7. Based on the following characteristics distinguish in tabular form the behavior of true solution, suspension and colloidal solution. (a) appearance (b) visibility (c) filterability (d) Tyndall effect (e) particle size                OR

(a) What is distillation ? List the two conditions essential for using this as a method of separation of components of a mixture. (b) Draw a labelled diagram of the apparatus used to separate a mixture of two miscible liquids.

8..Compare in tabular form , the properties of Solids, Liquids and Gases with respect to : (i) Shape (ii) Volume (iii) Compressibility (iv) Diffusion (v) Fluidity or Rigidity

OR ,

Account for the following : (a) For any physical state of a substance, the temperature remains constant during its change of state. (b) Water kept in an earthen pot becomes cool in summer. (c) We are able to sip hot tea from a saucer rather than from a cup.

Section B

09.If common salt is added to the unsaturated solution of water and common salt it will

(a) become a colloid (b) become a suspension (c) start showing Tyndall effect (d) remain a true solution

10.A student was asked to mix the white of an egg with water and stir well. The student observed that

(a) a transparent solution is formed.                 (b) a translucent mixture is formed.

(c) egg white settles down at the bottom.        (d) egg white floats on the surface.

11.The reaction of iron and sulphur to form iron sulphide takes place at :

(a) at high temperature                                   (b) in the presence of a catalyst

(c) at moderate temperature                         (d) in the presence of an acid

12.Which of the following compounds when dissolved in water gives coloured solution ?

(a) barium chloride (b) sugar solution (c) sodium chloride (d) copper sulphate

13.For determining the accurate melting point of ice we should prefer

(a) ice made from distilled water                   (b) ice made from tap water

(c) crushed dry ice mixed with salt                (d) a mixture of ice and salt

14.Mohan used a thermometer having 20 divisions between 30degC mark and 40degC mark. While determining boiling point of water using this thermometer he observed that the level of mercury becomes constant just 3 division below the 100o C mark. Mohan should record in his note book

(a) Least count=0.5degC, B.P.=97degC              (b) L.C.=0.5degC, B.P.=98.5degC

(c) L.C.=1degC, B.P.=98.5degC                          (d) L.C.=1degC , B.P.=97degC

15.Ramu was asked to separate a mixture of common salt and ammonium chloride. Sublimation is used to separate ammonium chloride because :

(a) ammonium chloride sublimes

(b) ammonium chloride changes directly from solid to gaseous state on heating

(c) mixture contain a sublimable volatile component and a non Sublimable impurity (salt)

(d) all the above

16.Which is the correct colour sequence of iron filings, sulphur and iron sulphide ?

(a) Greyish black, yellow, black             (b) Black, yellow, brown

(c) Brown, yellow, black                         (d) Black , yellow, greyish black

17.The colour of magnesium after rubbing with sand paper is

(a) Silvery white          (b) Grey           (c) Black         (d) Brown

18.Common salt and sand can be separated by :

(a) Filtration                 (b) Crystallisation          (c) Sedimentation and Decantation

(d) First dissolving in water, then by filtration and followed by crystallisation.

19.A student put five raisins each in two beakers A and B. Beaker A contained 20 mL of distilled water and beaker B has 20 mL of saturated sugar solution. After some time the student would observe that :

(a) raisins in beaker A were more swollen than those in beaker B.

(b) raisins in beaker B were more swollen than those in beaker A.

(c) raisins in both beakers A and B were equally swollen.

(d) raisins in beaker A did not swell up at all.

20.In the preparation of temporary mount of onion peel which of the following is not used :

(a) water (b) glycerine (c) safranin (d) alcohol

21.Arun, Deepa, Uma and Priya were asked to select a plant material which would not give blue black colour with iodine solution. Who did not select the right material ?

(a) Arun selected maize grains.              (b) Deepa selected wheat grains.

(c) Uma selected ground nut seeds.       (d) Priya selected potato.

22.Deepak washed a few grains of tur dal in water. The water became yellow. He then added a few drops of HCl to the same test tube, the water turned pink in colour. From the above test Deepak concluded that tur dal contains. (a) proteins (b) starch (c) turmeric (d) metanil yellow HCl

23.A student recorded the mass of dry raisins as 2.5g and the mass of raisins after soaking in water as 4 g . While performing the above experiment. The percentage of water absorbed by raisin is :

(a) 20% (b) 30% (c) 60% (d) 40%

24.The mixture of sand and water when filtered gives.

(a) pale brown solution                               (b) brown solution

(c) transparent solution                               (d) grey solution

25. When a mixture of sulphur powder and iron filings is heated.

(a) iron filings starts melting      (b) sulphur sublimates leaving iron filling behind

(c) ferrous sulphide is formed.   (d) sulphur melts