CCE SAMPLE QUESTION PAPER - Educomp Online

,.; 52 U-Like Science-IX eSSE eeE Sample Question Paper A-53(iii) Wider adaptability: Developing varieties for wider adaptability will help in stabilisingthe crop production under different envirorunental conditions. One variety can then be grownunder different climatic conditions in different areas.Most corrunon method is Hybridisation which involves crossing two varities having genes fordesired characteristics and bringing them together into a new \'ariety called hybrid.OrA poultry farmer wants to increase his broiler production. Explain three managementpractices he must follow to enhance the yield.In what way is the daily food requirement of broilers different from those of egg layers?Ans. (a) Management practices the farmer must follow to enhance the yield are:(i) Maintenance of temperature: To much high or low temperature affects the growth ofbroilers.(ii) Provision of hygienic conditions in housing and broiler feed.(iii) Prevention and control of diseases and pests.(b) Broiler chickens must be fed with protein rich with adequate fat, vitamins A and K dietsfor good growth rate and better feed efficiency.SECTIONQ.25. Four students prepared mixtures in wat~r by taking sugar, sand, chalk powder andstarch respectively, in four different test tubes. After stirring, the mixture that appeared clearand transparent was that of (1)(a) starch and water.(b) chalk powder and water.(c) sand and water.(d) sugar and water.Ans. (d) Out of sugar, sand, chalk powder and starch, only sugar is soluble in water.Q.26. Rohit mixed starch with water, boiled the mixture well and stirred it. He observedthat(l)(a) starch floats on the surface of water.(b) starch settles down at the bottom.(c) starch forms a translucent mixture.(d) starch forms a transparent mixture.Ans. (c) Starch forms a colloidal solu?on with water, which is translucent.Q.27. You are provided with a mixture of iron filings and sulphur powder. When you addcarbon disulphide to the mixture, you would observe (1)(a) iron particles dissolve and the solution turns black.(b) sulphur powder dissolves and the solution turns colourless.(c) sulphur powder dissolves and the solution turns yellow.(d) iron particles dissolve and the solution turns grey.Ans. (c) Iron particles do not dissolve in carbon disulphide. Sulphur dissolves in carbondisulphide forming a yellow solution.Q.~8. A strip of magnesium metal is burnt in the flame. It is observed that (1)(a) a yellow light appears.(b) a white dazzling light appears.B(c) magnesium starts melting.(d) lot of black smoke is produced.Ans. (b) Magnesium metal burns in the flame with a white dazzling light.Q.29. For determining the melting point of ice, the thermometer should be kept (l)(a) with its bulb in the ice cubes.(b) in contact with the inner wall of the beaker.(c) a little above the ice cubes.(d) in touch with the beaker from outside.Ans. (a) A correct melting point will be obtained only if the thermometer is kept with itsbulbs in the ice cubes. In any .other conditions (b), (c) or (d), the temperature obtained will bedifferent from melting point.Q.30. A student takes some water in a beaker· and heats it over a flame for determining itsboiling point. He keeps on taking its temperature reading. He observes that the temperatureof the water (1)(a) keeps on increasing regularly.(b) keeps on increasing irregularly.(c) first increases slowly, then decreases rapidly and eventually becomes constant.(d) first increases gradually and then becomes constant.Ans. (d) The temperature keeps increasing till the boiling points is reached. At the boilingpoint, the temperature becomes constant.Q.31. The colour of sodium chloride 'and ammonium chloride respectively is (1)(a) yellow and white.(b) white and yellow.(c) both are white.(d)' grey and yellow.Ans. (c) Both sodium chloride and arrunonium chloride are white coloured compounds.Q.32. In the laboratory, carbon disulphide is used as a solvent to separate a mixure of ironfilings and sulphur powder. What precaution has to be taken with carbon disulphide 7 (1)(a) Keep away from water.(b) Keep away from flame.(c) Keep away from air.(d) Keep away from iron sulphide.Ans. (b) Carbon disulphide is an inflarrunable compound. Therefore, it has to be kept awayfrom flame.Q.33. When iron nails are placed in copper sulphate solution, after 10 minutes, its bluecolour disappears and the solution appears (1)(a) reddish brown (b) blue(c) light blue (d) greenishAns. (d) The following reaction takes placeFe + CuS04 ~ FeS04 + CuFerrousSulphate(green colour)