CBSE Class 10 Science Question Paper SA2 2010 (8)

CBSE Class 10 Science Question Paper SA 2 2010 (8). 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.  Which  one is  a stronger acid,  with  pH=5  or with  pH=2  ?

2.  Construction of dams submerges large areas of forests, how does this contribute to the green house effect ?

3.  What is the lowest resistance that can be obtained by combining four coils of resistors of  4 Ω , 8 Ω , 12 Ω and 24 Ω ?

4.   If copper metal is  heated over a flame, it develops  a coating.    What is  the colour  and composition  of this  coating  ?

5.   What change will you observe if white silver chloride is placed in sunlight ?  Write an equation  for the reaction  and the type of the reaction.

6.    Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source  ?  Why ? Name the factors on which the resistance of a wire depends.

7.    Write the general principle involved in generating nuclear energy. Name one fuel used in a nuclear  reactor.

8.    What is a solenoid ?  Draw a sketch to show the pattern of field lines due to a solenoid carrying current.

9.    What is the function of the trachea ?  Why do its walls not collapse even when there is less air in it ?

10.   A chemical  compound having  a strong smell  of chlorine  is  used to disinfect  water. Name the compound and write a chemical  equation  to show its  preparation.    Give  its one uses.

11.   What are olfactory  indicators  ? Dry HCl gas does not change the colour  of dry blue litmus. Give reason.

12.   An electric  lamp  is  marked 22OV, 1OOW.  It is  used for 5 hours daily.  Calculate

(a)    Its resistance  while  glowing

(b)    Energy consumed in kWh/day.

13.   Most metals do not react with bases, but Zinc metal does. Suggest a reason. Write an equation for the reaction  between Zn and NaOH.

14.   Giving a schematic  diagram  of bio-gas  plant explain the production of bio-gas  and manure.  Give the composition of bio-gas.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2010 (8).