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Problem Solving Assessment(PSA)

Question-1
Atomic radius is measured in

(A) Centimetres	(B) Nanometres
(C) Decimetres	(D) Picometres

Question-2
The theory based on the laws of chemical combination is

(A) Avogadro's	(B) Dalton's
(C) Charle's	(D) Boyle's

Question-3 _______________ of an element gives us the mass of one atom of that element in atomic mass unit.

(A) Atomic mass	(B)Molecular mass
(C)Isotopic mass	(D)Relative atomic mass

Question-4
The law of definite proportions was proposed by

(A) John Dalton	(B) Richter
(C) Joseph Proust	(D) A.Lavoisier

Question-5
The number of atoms constituting a molecule is known as its

(A) Atomicity	(B) Atomic number
(C) Molecular mass	(D) Isotopic mass

Question-6
Formula of calcium oxide is

(A) CaO	(B) CaO₂
(C) Ca₂O	(D) Ca₂O₃

Question-7
The scientist who first use the symbols for elements in a very specific sense.

(A) John Dalton	(B) Rutherford
(C) Charles	(D) Boyle

Question-8
A negatively charged ion is called an

(A) Cation	(B) Anion
(C) Electron	(D) Proton

Question-9
The mass unit equal to exactly one-twelfth (1/12^th) the mass of one atom of carbon-12 is

(A) Molecular mass	(B) One atomic mass unit
(C) Chemical composition	(D) Chemical properties

Question-10
The ratio of given mass to the molar mass gives

(A) Atomic number	(B) Number of moles
(C) Molecular mass	(D) Atomic mass

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Std 9

CBSE

Practice in Related Chapters
Matter In Our Surroundings
Is Matter Around Us Pure
Atoms And Molecules
Structure Of The Atom