1. A_______ is the smallest particle of an element.
(A) Matter
(B) Element
(C) Substance
(D) Atom
2. An atom is the _______ of an element that retains its characteristics.
(A) Biggest
(B) Largest
(C) Smallest
(D) Heaviest
3. The central part of atom is _______.
(A) Electron
(B) Nucleus
(C) Neutron
(D) Proton
4. Proton has _______ charge.
(A) Negative
(B) Neutral
(C) Positive
(D) Random
5. Proton is _______ times heavier than electron.
(A) 1836
(B) 1842
(C) 1840
(D) 1974
6. The number of _______ and protons are equal in an atom.
(A) Shells
(B) Neutrons
(C) Nucleus
(D) Electrons
7. A neutron is _______ times heavier than electron.
(A) 1842
(B) 1836
(C) 1846
(D) 1850
8. Electron has _______ charge.
(A) Positive
(B) Negative
(C) No
(D) Constant
9. Electron is _______ than the mass of proton.
(A) Heavier
(B) Smaller
(C) Bigger
(D) Lighter
10. An atom has _______ number of electrons and protons.
(A) Greater
(B) Equal
(C) Lesser
(D) Unequal
11. The shells around the nucleus are named as _______.
(A) A, B, C...
(B) X, Y, Z...
(C) K, L, M...
(D) None of above
12. K shell has _______ electrons.
(A) 6
(B) 4
(C) 2
(D) 8
13. The electron in incomplete outermost orbit is called _______ electron.
(A) Heavy
(B) Lighter
(C) Unique
(D) Valance
14. The _______ is the closest shell to the nucleus.
(A) N
(B) L
(C) M
(D) K
15. Valance electrons are _______ tightly bound to the atom.
(A) Very
(B) Also
(C) Less
(D) None of above
16. The material that does not conduct current is called _______.
(A) Conductor
(B) Insulator
(C) Semi conductor
(D) Composite
17. The material between conductor and insulator is called _______.
(A) Matter
(B) Composite
(C) Ceramics
(D) Semiconductor
18. A conductor is a material that _______ conducts electrical current.
(A) Swiftly
(B) Easily
(C) Sharply
(D) Fast
19. The unit of current is _______.
(A) Joule
(B) Ampere
(C) Volt
(D) Ohm
20. The unit of potential is _______.
(A) Current
(B) Volt
(C) Ampere
(D) Ohm