1. .................. is used in electric bulbs and flourescent lamps

2. A solution consisting of two substances is called

3. Ability to do work is called

4. Which gass is used in photosynthesis?

5. The particles are settled down at the bottom of the container.

6. The part of the solution which is less in quantity called

7. A spherical mirror whose inner surface is reflecting is called

8. The protective layer of leaf is called

9. Which substance is called universal solvent

10. Meteoroid which burns after entering earth's atmosphere is called

11. Matter consisting of one kind of atoms is called

12. Gear system is an advanced shape of

13. Which factor affects the soulbality of substances

14. The speed of sound is........... Meter per second in iron

15. ................. Cell has only one large vacule

16. ....................... Is a friendly relationship between two organisms

17. The structural and functional unit of life is called ....................

18. The animals which kill and hunt other animals for food called

19. America launched its first space station skylab into space in

20. The energy in an object due its motion is called

21. Air contains 0.03%...........

22. The number of naturally occurring elements is

23. Which of the following is not detected by skin?

24. Olfactory nerves links....... and...........

25. Air contain.................. Nitrogen

26. The energy in an object due its pissition is called

27. How Many types of mixture

28. What is receptor

29. The main components of environment are

30. The biotic components of the environment Include..............