1. The basic unit of matter is:
A. atom
B. molecule
C. compound
D. mixture

2. Electron was discovered by:
A. J J Thomson
B. Dalton
C. Rutherford
D. Bohr

3. Proton carries:
A. positive charge
B. negative charge
C. no charge
D. double charge

4. Neutron has:
A. no charge
B. positive charge
C. negative charge
D. double charge

5. The center of an atom is called:
A. nucleus
B. shell
C. molecule
D. orbit

6. Rutherford experiment used:
A. gold foil
B. copper foil
C. silver foil
D. iron foil

7. Atomic number equals:
A. number of protons
B. number of neutrons
C. number of electrons only
D. mass

8. Mass number equals:
A. protons plus neutrons
B. electrons plus protons
C. electrons plus neutrons
D. neutrons only

9. Bohr proposed:
A. fixed energy levels
B. gravity law
C. motion law
D. cell theory

10. Electrons move around:
A. nucleus
B. neutron
C. proton
D. molecule

11. Protons are found in:
A. nucleus
B. shell
C. orbit
D. molecule

12. Neutrons contribute to:
A. mass of atom
B. charge
C. color
D. size

13. Isotopes have:
A. same atomic number
B. same mass number
C. same electrons
D. same neutrons

14. Isobars have:
A. same mass number
B. same atomic number
C. same protons
D. same electrons

15. Atom is mostly:
A. empty space
B. solid
C. liquid
D. gas

16. Atomic number determines:
A. element identity
B. color
C. size
D. shape

17. Hydrogen has:
A. one proton
B. two protons
C. three protons
D. four protons

18. Oxygen has:
A. eight protons
B. six protons
C. two protons
D. four protons

19. Electrons carry:
A. negative charge
B. positive charge
C. neutral charge
D. double charge