Basic Concepts - 11
1.
Atom is the smallest particle of an element which have independent existence.
a) False
b) True
2.
Democritus called the basic unit of matter as atom.
a) True
b) False
3.
John Dalton determined the atomic masses of elements.
a) True
b) False
4.
An ordinary optical micro scope can measure the size of an object upto 400 nm
a) False
b) True
5.
Diameter of atoms are of the order of 2 X10
-10
m.
a) True
b) False
6.
1 amu is 1.661 X 10
-24
kg.
a) True
b) False
7.
Masses of atoms range from 10
-27
to 10
-25
kg.
a) False
b) True
8.
A fullstop can have about twenty million of atoms.
a) True
b) False
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