(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
2. If common salt is added to an unsaturated solution of common salt in water it will
(a) Become a colloid
(b) Become a suspension
(c) start showing Tyndall effect
(d) remain a true solution
3. 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
4. When barium chloride solution is mixed with sodium sulphate solution
(a) a white precipitate is formed instantaneously
(b) a white precipitate is formed only after some time
(c) a yellow precipitate is formed instantaneously
(d) a yellow precipitate is formed
5. A student heats some water in a round bottomed flask for determining its boiling point. He keeps on recording its thermometer readings. On the basis of his observation he would
conclude that the temperature of water :
(a) keeps on increasing regularly.
(b) keeps on increasing irregularly.
(c) first increases slowly, then rapidly and eventually becomes constant.
(d) first increases rapidly, then slowly and finally becomes constant.
6. A student made a list of following four precautions for the experiment on determination of melting point of ice. The incorrect precaution is :
(a) The bulb of the thermometer should be kept surrounded with crushed ice.
(b) Ice should be stirred regularly.
(c) A small quantity of common salt should be added to the crushed ice to avoid quick melting.
(d) The temperature should be recorded keeping the eye in the level of mercury.
7. The sequence commonly followed for separating a mixture of sand, common salt and ammonium chloride is :
(A) use of magnet, dissolving in water, filtration, sublimation
(B) dissolving in water, filtration, evaporation, sublimation
(C) sublimation, use of magnet, dissolving in water, filtration
(D) sublimation, dissolving in water, filtration, evaporation
8. 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
9. The colour of the pure ammonium chloride powder is :
(a) White (b) Blue (c) Green (d) Red
10. Raisins swell up after being placed them in a beaker containing water for sometime because. (a) Water inside the raisins exits when placed in a beaker of water.
(b) The concentration of water in the cell sap is the same as that of water in the beaker.
(c) The concentration of water in the cell sap is higher than the water in the beaker.
(d) The concentration of water in the cell sap is lesser than that of water in the beaker
11. A student accidentally spilled a few drops of a solution over the shirt, the area became blue black because the solution was :
(a) potassium dichromate which oxidized the piece of shirt.
(b) HCl which reacted with metanil yellow pigment of the shirt.
(c) iodine which reacted with the starched part of the shirt
(d) an acid which burnt the patch of the shirt.
12. Metanil yellow is an adulterant of :
(a) cereals (b) milk products (c) turmeric powder (d) pulses
13. Animal cells are commonly stained with :
(a) methylene blue (b) acetocarmine (c) safranin (d) iodine solution
14. A student soaked 10 g raisins in 75 mL of distilled water in two beakers A and B. He maintained beaker A at 20C and beaker B at 40
C. After an hour, the percentage of water absorbed will be :
(a) same in beaker A and B
(b) more in A than in B
(c) more in B than in A
(d) twice as much in B as in A
15. The mixture of sand and water when filtered gives.
(a) pale brown solution (b) brown solution (c) transparent solution (d) grey solution
16. When we start heating mixture of sulphur powder and iron filings, we observe that :
(a) sulphur starts melting
(b) iron filings start melting
(c) mixture becomes red hot
(d) mixture evaporates
17. When barium chloride solution is added to sodium sulphate solution :
(a) no reaction takes place
(b) colourless solution is formed
(c) white precipitate is formed
(d) blue precipitate is formed
18. Which of the following would you choose to determine the melting point of ice in your laboratory ?
(a) dry crushed ice
(b) ice cubes
(c) ice added to water
(d) slab of ice
19. While determining the boiling point of water pumice stone pieces are added to :
(a) spread the heat uniformly.
(b) prevent loss of heat energy.
(c) to stop bumping of water.
(d) to avoid cracking of the glass container
20. A student by mistake mixed iron filings and sulphur powder. He wanted to separate them from each other. The method he should use is to dissolve the mixture in :
(a) boiling water (b) cold water (c) carbon disulphide (d) kerosene
SUMMATIVE ASSESSMENT– I (2012) SCIENCE Class –IX CBSE SAMPLE PAPER
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