1. Which philosophers used the word ‘atom’?
(A) Greeks
(B) Latin
(C) Indian
(D) French
2. Example of an element is:
(A) Salt
(B) Water
(C) Carbon
(D) Glucose
3. Number of natural elements are:
(A) 120
(B) 125
(C) 118
(D) 111
4. Number of artificial / manmade elements are:
(A) 26
(B) 28
(C) 20
(D) 30
5. Symbol of Barium is:
(A) B
(B) none of these
(C) Be
(D) Ba
6. Valency of Zinc is:
(A) 4
(B) 2
(C) 3
(D) 5
7. Empirical formula of Benzene is:
(A) C₂H₂
(B) C₃H₃
(C) CH
(D) none
8. Avogadro’s number is represented as:
(A) Ma
(B) CH
(C) Ba
(D) Na
9. Proton number is also called:
(A) Valency
(B) None
(C) Mass number
(D) Atomic number
10. 1 amu is equal to:
(A) none
(B) 16.6 × 10²⁷ Kg
(C) 1.66 × 10²⁷ g
(D) 1.66 × 10⁻²⁷ g