10th Class Model Paper

Model Paper

Refraction of light at Plan Surface

Periodic Table 

Marks 50

I Answer the following questions. Each question carries half mark.    12 x 1/2 = 6M 

1. Write Snell's law?

2. What is the value of speed of light in vaccum?

3. What is the refractive index of diamond?

4. Write the units of refractive index?

5. On which principle optical fibres work?

6. Critical angle of diamond is?

7. Write the examples of Dobereiner's triad?

8. How many elements are there in 6th period?

9. What are representative elements?

10. 18th group elements are known as?

11. Which group elements are known as Halogens?

12. Eka Boron is called as?

II Answer the following questions. Each question carries one mark.          8 x 1=8M

13. Define refraction?

14. Define critical angle?

15. Define total internal reflection of light?

16. Define relative refractive index of light?

17. Define Dobereiner's law of triads?

18. I A and II A group elements are known as?

19. f- block elements are known as?

20. VI A group elements are known as?

III Answer the following questions. Each question  carries two  mark.       8 x 2=16M

21. Why is it difficult to shoot a fish swimming in water?

22. The speed of light in diamond is 1,24,000 km/s. Find the refractive index of diamond?

23. Why do stars appear twinkling?

24. State the laws of refraction?

25. Define periodic law?

26. Define Newlands law of octaves?

27. An element has atomic number 19. Where would you expect in the periodic table. 

28. How do metallic and non metallic characters vary in groups and in periods?

IV Answer the following questions. Each question carries four mark.       5 x 4=20M

29. How do you verify sin i/ sin r is a constant?

                                  Or 

Define Modern Periodic law? Discuss the construction of long form of periodic table?

30. Explain the formation of Mirage?

                                  Or 

Write the silent features of Meendeleev's periodic table?

31. Explain the refraction of light through a glass slab with a neat ray diagram.

                                  Or 

Define atomic radius ionization energy electron affinity electro negativity

32. Explain the phenomenon of total internal reflection with one or two activities.

                                   Or 

How does atomic radius ionization energy electron affinity and electro negativity vary in groups and in periods?

33. Write the applications of total internal reflection?

                                   Or 

Explain how the elements are classified in to s,p,d,f block elements in the modern Periodic table?