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1. The term Parmanu was first used by
A. Democritus
B. Maharishi Kanad
C. John Dalton
D. Lavoisier
2. The Greek philosopher who called smallest particles atoms was
A. Leucippus
B. Aristotle
C. Democritus
D. Dalton
3. Antoine Lavoisier is known for establishing
A. Atomic theory
B. Law of definite proportions
C. Laws of chemical combination
D. Periodic law
4. Law of Conservation of Mass was established by
A. Joseph Proust
B. John Dalton
C. Antoine Lavoisier
D. Rutherford
5. The Law of Constant Proportions was stated by
A. Boyle
B. Proust
C. Dalton
D. Mendeleev
6. According to the Law of Constant Proportions, elements in a compound are present
A. In any ratio
B. In variable proportions
C. In definite proportions by mass
D. In equal amounts
7. Water always contains hydrogen and oxygen in the mass ratio of
A. 1:1
B. 1:2
C. 1:8
D. 2:8
8. Dalton’s atomic theory explains
A. Only Law of definite proportions
B. Only Law of conservation of mass
C. Both above laws
D. None of these
9. Atoms are
A. Visible to naked eyes
B. Made of protons only
C. Very small indivisible particles
D. Larger than molecules
10. Dalton’s theory stated that atoms of the same element are
A. Different in mass
B. Identical in mass and properties
C. Unstable
D. Charged
11. The smallest particle of matter that takes part in chemical reactions is
A. Electron
B. Atom
C. Molecule
D. Proton
12. The unit used to measure atomic radius is
A. Millimeter
B. Centimeter
C. Nanometer
D. Angstrom
13. 1 nm equals
A. 10⁻⁹ m
B. 10⁻⁶ m
C. 10⁻³ m
D. 10⁻⁸ m
14. The symbol of Iron is derived from its Latin name
A. Ferrous
B. Ferrum
C. Iridium
D. Fero
15. The Latin name of sodium is
A. Sodum
B. Natrium
C. Sodius
D. Naterium
16. The Latin name of potassium is
A. Potasium
B. Kalium
C. Kalos
D. Poten
17. The atomic mass unit is based on
A. Hydrogen
B. Carbon-12 isotope
C. Oxygen
D. Nitrogen
18. Relative atomic mass is the mass of an atom compared to
A. Hydrogen atom
B. Carbon-12 atom
C. Oxygen atom
D. Nitrogen atom
19. The atomic mass of oxygen is
A. 12 u
B. 14 u
C. 16 u
D. 18 u
20. The atomic mass of sodium is
A. 20 u
B. 21 u
C. 23 u
D. 25 u
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