CBSE Class 10 Science Question Paper SA 1 2011 (4)

CBSE Class 10 Science Question Paper SA 1 2011 (4). 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.

SUMMATIVE ASSESSMENT - I (2011)

SCIENCE Class – X

SECTION-A

1. State one basic difference between a physical change and a chemical change.

2. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify Y and Z. 

3. List two main constituents of biogas.

4. How is an ammeter connected in a circuit to measure current flowing through it ?

5. The way metals like sodium, magnesium and iron react with air and water is an indication of their relative positions in the „reactivity series‟. Is this statement true ? Justify your answer with examples.

6. Though the compounds such as glucose and alcohol have hydrogen atoms in their molecule yet they are not categorized as acids, why ?

7. Using balanced chemical equation explain the difference between a displacement reaction and a double displacement reaction.

8. Using a suitable chemical equation justify that some chemical reactions are determined by :

     (i) change in colour

     (ii) change in temperature. 

9. What is saliva ? State its role in the digestion of food.

10.Biogas is considered to be a boon to the farmers. Give reasons.

11. An electric heater draws a current of 10A when connected to a 200 V supply. What current will the heater draw when it is connected to 220 V supply. 

12. Insulation cover of which colour is conventionally used for earth wire ? Why is an earth wire connected to metallic parts of appliances ?

13. A 9 om resistance is cut into three equal parts and connected in parallel. Find the equivalent resistance of the combination. 

14. (a) Classify the following reactions into different types

      (i) AgNO3 (aq)+NaCl(aq) ->AgCl(s)+NaNO3(aq)

      (ii) CaO(s)+H2O -> Ca(OH)2

      (iii) 2KClO3 (s) ->2KCl+3O2

15.  (a) What is universal indicator ?

      (b) Write the chemical equation involved in the preparation of sodium hydroxide. Name the process.

16. What are the final products of carbohydrates, proteins and fats after their digestion.

17.  (a) Which plant hormone is present in greater concentration in the areas of rapid cell division ?

      (b) Give one example of a plant growth promoter and a plant growth inhibitor.

18. Which organ secrets a hormone when blood sugar rises in our body ? Name the hormone and name one enzyme released by this organ.

19. (a) “The breathing cycle is rhythmic whereas, exchange of gases is a continuous process”. Justify this statement.

     (b) What happens if conducting tubes of circulatory system develops a leak ? State in brief, how could this be avoided ?

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