1. The lightest part of atom is

2. What is the mode of  transferring of heat for energy of sun reaching  us

3. What is the name of our Galaxy

4. Sound can not pass through

5. The rate of flow of charge is called

6. which of the following is not used in human respiratory system

7. What is the unit of frequency

8. In which waves particles of medium move perpendicularly

9. By addition of what food becomes soft and fine

10. The largest artery is

11. The reverse process of peristalsis is called

12. Where are pollen grains located in

13. Human heart has ...............chambers

14. Water is essential for

15. Which circuit is used in domestic wiring

16. flowers are .................part of plant

17. There are ...............major habitats.

18. Bile is released by

19. Food for algae is

20. Blood is carried from lungs to heart by