MANOJ KUMAR (SHELFORD)

Sunday, September 9, 2012

summative assessment- 1 cbse class x science, revision sample paper.


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Read the instructions carefully before answering
·         Try to answer in your own words as far as possible.
·         Include diagrams wherever required.
·         Diagrams should be drawn and  labeled with pencil only.
·         
1 marks X 9 = 9 marks (A)
1.      Why should a magnesium ribbon be cleaned before burning in air?
2.      Why do ionic compounds have high melting points?
3.      Why does an aqueous solution of an acid conduct electricity?
4.      What processes would you consider essential for maintaining life?
5.      Which part of the brain maintains posture and equilibrium of the body?
6.      What is meant by saying that the potential difference between two points is 1 V?
7.      What is a good source of energy?
8.      What is a good fuel?
9.      What is the role of the acid in our stomach?
2 marks X 9 =  18 marks (B)
10.  Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
11.  Why should curd and sour substances not be kept in brass and copper vessels?
12.  What are plant hormones? Give two examples?
13.  Why is the use of iodised salt advisable?
14.  How is the small intestine designed to absorb digested food?
15.  A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit.
16.  Draw magnetic field lines around a bar magnet.
17.  If you could use any source of energy for heating your food, which one would you use and why?
18.  what are the disadvantages of fossil fuels?
3 marks x 6 = 18 marks (C)  
19.  3. Identify the substances that are oxidised and the substances that are reduced in the following reactions.
20.  (i) 4Na(s) + O2(g) 2Na2O(s)
(ii) CuO(s) + H2(g) Cu(s) + H2O(l)
21.  What are the different ways in which glucose is oxidized to provide energy in various organisms?
22.  What is a balanced chemical equation? Why should chemical equations be balanced?
23.  What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.
24.  Compare and contrast bio-mass and hydro electricity as sources of energy.
5 marks X 3 = 15 marks (D)
25.  Write the balanced chemical equations for the following reactions.
(a)   Calcium hydroxide + Carbon dioxide    Calcium
carbonate + Water
(b) Zinc + Silver nitrate    Zinc nitrate + Silver
(c) Aluminium + Copper chloride    Aluminium chloride +
      Copper
(d) Barium chloride + Potassium sulphate Barium sulphate
      + Potassium chloride
26.  Describe double circulation in human beings. Why is it necessary?
27.  (1) The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?
(2)  Resistance of a metal wire of length 1 m is 26 Ω at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature? Using Table 12.2, predict the material of the wire.

Total marks = 9(A) + 18(B) + 18(C) + 15(D)   = 60 marks

“Best of luck”           
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