CBSE Class 10 Science Sample Paper 2012 Set D

1] Name the type of spherical mirror which

   (a) has +ve focal length.

   (b) always forms a virtual image.

2] "Save the Tiger" campaign is being over emphasized these days by our Government. What may be the possible reason?

3] Give any two ways in which biodegradable substances would affect the environment.

4] What are sexually transmitted diseases? Name four such diseases. Which one of them damages the immune system of human body?

    (i) HIV-AIDS (ii) Warts

    (iii) Syphilis (iv) Gonorrhea

5] Both carbon and silicon belong to group 14 of the periodic table. But the tendency to exhibit catenation in carbon is much more than in silicon. Explain.

6] List any two causes of our failure to sustain availability of underground water.

7] (a) Refractive indices of media A, B, C and D are given below : Medium Refractive Index

Please refer to attached file for CBSE Class 10 Science Sample Paper 2012 Set D