1. A ______ is the smallest particle of an element
(A) atom
(B) element
(C) substance
(D) matter
2. An atom is the ______ of an element that retains its characteristics
(A) smallest
(B) biggest
(C) largest
(D) heaviest
3. The central part of atom is ______
(A) electron
(B) nucleus
(C) neutron
(D) proton
4. Proton has ______ charge
(A) positive
(B) negative
(C) neutral
(D) random
5. Proton is ______ times heavier than electron
(A) 1842
(B) 1974
(C) 1840
(D) 1836
6. The number of ______ and protons are equal in an atom
(A) neutrons
(B) electrons
(C) nucleus
(D) shells
7. A neutron is ______ times heavier than electron
(A) 1836
(B) 1842
(C) 1850
(D) 1846
8. Electron has ______ charge
(A) positive
(B) constant
(C) no
(D) negative
9. Electron is ______ than the mass of proton
(A) lighter
(B) heavier
(C) bigger
(D) smaller
10. An atom has ______ number of electrons and protons
(A) unequal
(B) greater
(C) lesser
(D) equal
11. The shells around the nucleus are named as ______
(A) A, B, C…
(B) K, L, M…
(C) X, Y, Z…
(D) none of above
12. K shell has ______ electrons
(A) 4
(B) 2
(C) 6
(D) 8
13. The electron in incomplete outermost orbit is called ______ electron
(A) heavy
(B) lighter
(C) valance
(D) unique
14. The ______ is the closest shell to the nucleus
(A) K
(B) L
(C) M
(D) N
15. Valance electrons are ______ tightly bound to the atom
(A) very
(B) less
(C) also
(D) none of above
16. The material that does not conduct current is called ______
(A) conductor
(B) composite
(C) semiconductor
(D) insulator
17. The material between conductor and insulator is called ______
(A) semiconductor
(B) composite
(C) matter
(D) ceramics
18. A conductor is a material that ______ conducts electrical current
(A) easily
(B) swiftly
(C) sharply
(D) fast
19. The unit of current is ______
(A) ohm
(B) joule
(C) volt
(D) ampere
20. The unit of potential is ______
(A) current
(B) ampere
(C) volt
(D) ohm