"FORCE & NATURAL": HTML5 Crossword

Across

4. Like charges ............ each other (7)
5. Example for contact force (8)
10. What is the name of the instrument used to measure atmospheric pressure? (9)
11. What is the SI unit of pressure? (6)
12. What kind of force is an electrostatic force? (3,7)
13. Who discovered the static electricity or lightning in clouds (8,8)
14. Waves produced on the Earth’s surface because of tremors. (7,5)
15. Name the device used to protect buildings from lightning. (9,9)
17. A device used to test whether an object is carrying a charge or not (12)
18. What is the uppermost layer of the earth called? (5)

Down

1. The electric charges generated by rubbing are called ............ charges (6)
2. SI unit of force (6)
3. The strength of a force is usually expressed by its (9)
6. Sudden shaking and trembling of earth is called (10)
7. Force per unit area (8)
8. What are weak zones called? (7,5)
9. Name the force due to which every object falls on earth (13,5)
16. A push or pull on an object is called................. (5)