Classical

1. Difference between "Mass", "Matter" and "Energy"
2. How is Blood Pressure measured?
3. Does Energy is associated with Intrinsic Inertia, the Rest Mass?
4. Explanation of words in "The Special Theory of Relativity"
5. Principles of Special Theory of Light 
6. Centripetal and Centrifugal Force 
7. Difference between Kinematics & Dynamics 
8. Universal Law of Gravitation 
9. Nature of Orbits for a body projected with different speeds
10. Why is the sky blue?
11. How does mass depend on speed?
12. What is wave motion?
13. How does an atomic clock work?
14. What is the technical difference between Gravity & Gravitation? 
15. What are the differences between Jet Air Planes & Rockets
16. What is an Event? Relativity of Simultaneity
17. What is Fluid?
18. What is the difference between Absolute Pressure, Gauge Pressure & Vacuum Pressure?
19. Properties of Longitudinal Waves