1. Name the extremely small particles which constitute matter.

2. What do we call the negatively charged particles emitted from the cathode?

3. What is a cathode ray tube?

4. What is an anode?

5. Why the canal rays obtained by using different gases have different e/m values?

6. Who proposed the nuclear model for the structure of atom?

7. Define nucleus.

8. What is a proton?

9. What is a neutron?

10. How many neutrons are present in the alpha-particle?