CBSE Class 10 Science Question Paper 2007 (1)

CBSE Class 10 Science Question Paper 2007 (1). 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.

SCIENCE AND TECHNOLOGY (Theory)

SECTION A

1. The pH values of three solutions A, B and C having equal molar concentration are respectively 2.0, 7.0 and 13.0 at 298 K. Which of the three solutions represents an acid solution ? 

2. Write the chemical formula of simplest ketone. 

3. Why is our galaxy called ‘Milky Way’ ? 

4. If the distance between two electric charges is doubled, how much will the force exerting between them change to ? 

5. State four characteristic features of ‘Dynamic Equilibrium’. 

6. What is Fehling’s reagent ? What would you observe on heating formalin with Fehling’s reagent in a test tube ? 

7. Distinguish between a ‘geosynchronous’ and a ‘polar’ satellite. What is the usual time period of a 

(a) geosynchronous satellite ?

(b) polar satellite ?

8. An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use. 

9. What is ‘Plaster of Paris’ chemically ? How is it obtained from gypsum ? Write the condition and chemical equation involved in its manufacture. 

10. Define the term, ‘allotropy’. In which kind of properties are the two allotropes of an element (i) similar, (ii) different ? How can the two allotropes of sulphur be distinguished from one another ? 

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