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

9th Chemistry : MCQ Is Matter around us pure Practical based Guess Questions

9th  Chemistry : MULTIPLE CHOICE QUESTION ON PRACTICLE SKILLS

EXPERIMENT NO –2

1. Which one of the following is an example of heterogeneous mixture

a. NaCl + water                                               b. kerosene + water

c. sugar + water                                   d. alum + water

2. Which one of the following is a mixture of two elements

a. iron fillings + sulphur powder         b. sugar + common salt

c. water +milk                                                d. air

3. Which one is not the property of a mixture

a. heterogeneous                                 b. variable composition

c . constant composition                    d. none of these

4.Correct method of separating iron fillings from sulphur powder

a. heating in china dish                       b. heating in boiling tube

c. heating in water                               d. moving magnet

5. In the formation of which one a large quantity of heat is involved

a. compound                                       b. colloid

c. true solution                                                d. each one

6. When a magnet is moved through of iron fillings and sulphur powder , then

a. iron fillings will cling to magnet     b. black mass is produced

c. sulphur will cling to magnet            d. none of these

7.When a mixture of iron fillings is heated with sulphur powder

a. nothing happens                              b. black mass is formed

c. yellow mass is formed                     d. white mass is formed

8. which one is a mixture

a. salad of fruits                                  b. air

c. sea water                                         d. all of the above

9. Name the process of conversion of solid to vapor

a. evaporation                                      b. fusion

c. distillation                                       d. sublimation

10.Which one of the following is a pure substance

a.milk                                                  b.cold drink

c .carbon d oxide                                d. brass

11.What is observed when iron fillings and sulphur powder is heated in a china dish

a. sulphur melts                                   b. iron melts

c. mixture evaporates                          d.. yellow mass is formed

12. Mixture is always –

a. homogenous                                                b. heterogeneous

c. homogenous or heterogeneous        d. none of these

13. Compound is always –

a. homogenous                                                b. heterogeneous

c. homogenous or heterogeneous        d. none of these

14..Which of the following is a compound

a. blood                                               b. air

c. soil                                                   d. water

15.On heating iron and sulphur in a china dish

a. mixture is formed                            b. compound is formed

c. both are formed                               d. no change

MCQ 9th Questions on Practical Skills Experiment No.--1 Chemistry: Is Matter around us Pure

MULTIPLE CHOICE QUESTION ON PRACTICLE SKILLS EXPERIMENT NO --1

1. Which one of the following does not form true solution in water

a. common salt b. alum c. albumin d. cane sugar

2. Which one of the following forms a colloid in water

a . common salt b. alum c. albumin d. cane sugar

3.. Which one of the following forms a colloid in water

a. soil b. sand c. chalk powder d .none of these

4. Which one of the following is highly soluble in water

a. common salt b. potash alum c. cane sugar d. starch

5. Which one of the following does not form true solution in water at room temperature

(a) common salt b. alum c. albumin d. cane sugar

6. . Which one of the following is least soluble in water

a. common salt b. potash alum c. cane sugar d. starch

7.Which one of the following can be separated by filtration

a. common salt and water b. sugar and water

c. soil and water d. starch and water

8. In which one of the following the particle size is in the range of 0.1 nm to 1.0 nm

a. true solution b . suspension c. colloid d. none of these

9. .. Which one of the following forms a colloid in water

a. sugar b. sand c. chalk powder d. none of these

10.Tyndall effect is observed in which one of the following

a. true solution b . suspension c. colloid d. none of these

11.Sedimention does not take place in which one of the following

a. common salt and water b. sugar and water

c. soil and water d. starch and water

12.Which one will boil at a constant temperature ?

a. true solution b. colloid c. compound d. each one ..

13.Which represents a constant composition

a. true solution b. colloid c. suspension d.. none of these