CBSE Class 10 Science Question Paper SA1 2010 (4)

CBSE Class 10 Science Question Paper SA 1 2010 (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.

SECTION A

1.  What do we call the movement of shoot towards light ?

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. Write two different  ways of harnessing energy from ocean

4. What is the minimum  resistance which can be made using five resistors each of 1/5 Ω?

5. What is Plaster of Paris ? How  it is obtained from Gypsum. Write chemical reaction.Give its one use.

6.  A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed.  Write the chemical reaction involved and also mention the type of the chemical reaction ?

7.  Write chemical equations for the reactions taking place when

(i) zinc sulphide is heated in air

(ii)calcination of zinc carbonate is done.

8.Three 2Ω resistors, A, B and C, are connected as shown in Figure. Each of them dissipates energy and can withstand  a maximum  power of 18 W without  melting. Find the maximum  current that can flow  through the three resistors.

9.  Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light.  Which one will  live longer ?  Give reasons.

10.   What is the role of fuse, used in series with  any electrical appliance ?  Why should a fuse with  defined rating not be replaced by one with  a larger rating ?"

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 1 2010 (4).