CBSE Class 9 Computer Science Question Paper SA 1 2011. Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.
1.What happens when you pour some acetone on your palm ?
2.In a high jump athletic event the athletes are made to fall on a cushioned bed. Why ?
3.Name the plastid which stores starch, oils and protein granules.
4.What is a solution ? On which factor does a solution said to be diluted, concentrated or saturated ?
5.Give reason : (a) Water droplets appear on the outer surface of a tumbler containing ice cold water. (b) People prefer to wear cotton clothes in summer. (c) On a hot sunny day people sprinkle water on the roof or open ground.
6.State the separation technique you would apply for the separation of the following ? (a) Sodium chloride from its solution in water (b) Tea leaves from tea (c) Iron pins from sand (d) Different pigments from an extract of leaves (e) Butter from curd (f) Fine mud particles suspended in water.
7.(a) State any two differences between mixture and compound.
(a) Draw a labelled diagram of the experimental set up used for fractional distillation. How is this set up different from simple distillation ?
(a) Write any two differences between chemical change and physical change. (b) State one instance where water undergoes a physical change and one in which it undergoes a chemical change.(c) Mention any two applications of chromatography.
8.List three characteristics of particles of matter. Describe one example for each characteristic to illustrate it. Name the characteristics which are responsible for (a) spreading of smell of scent in a room and (b) water taking shape of the vessel in which poured.
The temperature-time graph given below shows the heating curve for pure wax. From the graph answer the following.
(a) What is the physical state of the substance at the points A, B, C and D ?
(b) What is the melting point of the substance ?
(c) What is its boiling point ?
(d) Which portions of the graph indicate that change of state is taking place.
(e) Name the terms used for heat absorbed during change of states involved in above processes.
Please click the link below to download pdf file of CBSE Class 9 Chemistry Question Paper SA1 2011 (2).