Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.

ISC Class 12 Physics Solved Question Paper 2012

Short Answer Type

11. Which electromagnetic radiation has wavelength greater than that of X rays and smaller than that of visible light?

649 Views

12. How did Fresnel construct a biprism in order to study interference of light?

864 Views

13. State Brewster’s law of polarisation of light.

939 Views

14. A thin convex lens (L₁) of focal length 80 cm and a thin concave lens (L₂) of focal length f are kept co-axially, 20 cm apart as shown in figure 3 below. When a narrow and parallel beam of light is incident on the convex lens, bean emerging fron the concave lens is also a parallel beam. Find f.

358 Views

15. What condition must be satisfied by two thin lenses kept in contact so that they form an achromatic doublet, i.e. a combination free from chromatic aberration ?

2211 Views

16. Threshold frequency of a certain metal for photo-electric emission is 5x10¹⁴Hz. Calculate its work function.

429 Views

17. What conclusion was drawn by Rutherford based on Geiger-Marsden’s experiment on scattering of alpha particles?

790 Views

18. Write a balanced nuclear reaction showing emission of a β- particle by 90Th²³⁴ (Symbol of daughter nucleus formed in the process is Pa.)

The balanced nuclear reaction is as given below:

$Th presubscript 90 presuperscript 234 space rightwards arrow space Pa presubscript 91 presuperscript 234 space plus space straight beta presubscript negative 1 end presubscript superscript straight o space plus space straight nu with bar on top$