CBSE Class 10 Science Sample Paper 2014 Set K

SECTION-A 

1. Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire. why.?

2. Name any one metal which is found in its free state in nature.

3. List any two advantages of burning charcoal over burning wood.

4. What happens to resistance of a conductor when its area of cross-section is increased ?

5. Using the electronic configurations, explain how Magnesium atom combines with Oxygen atom to form magnesium oxide by transfer of electrons.

6. State in brief the preparation of washing soda from baking soda. Write balanced chemical equation of the reaction involved.

7. Write the balanced equation for the following reaction and identify the type of reaction in each case.

(i) Potassium bromide + Barium Iodide → Potassium iodide + Barium bromide.

(ii) Hydrogen (g) + Chlorine(g) → Hydrogen Chloride (g)

8. What is the colour of FeSO₄. 7H₂O crystals ? How does this colour change upon heating ? Give balanced chemical equation for the changes. FeSO₄. 7H₂O

9. Explain the process of nutrition in amoeba.

10. Give two advantages of using nuclear energy.

11. The wattage of a bulb is 24 W when it is connected to a 12V battery. Calculate its effective wattage if it operates on a 6 V battery (Neglect the change in resistance due to unequal heating of the filament in the two cases).

Please refer to attached file for CBSE Class 10 Science Sample Paper 2014 Set K