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Published on: 05/12/2020
10th Standard Science Atoms and Molecules English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
How many molecules are present in one gram of hydrogen?
6.023 x 1023
3.0115 x 1023
2.5 x 1023
1.5 x 1023
2.
The total number of atoms represented by the compound CuSO4. 5H2O is
27
21
5
8
3.
Adding electrons to an atom will result in a (an):
Molecule
Anion
Cation
Salt
4.
The number of molecules in 16.0 g of oxygen is:
6.023 x 1023
6.023 x 10-23
3.01 x 10-23
3.0115 x 1023
5.
The number of particles present in one mole of any substance is equal to
6.023 x 1023
60.23 x 1023
6.023 x 1027
60.23 x 1027
6.
The total number of electrons present in 16 g of methane gas is
96.352 x 1023
48.176 x 1023
6.023 x 1023
30.11 x 1023
7.
The relative atomic masses of many elements are not whole number because
they are not determined accurately
they exist as isotopes
due to impurities
atoms ionize
8.
The atomic number of an element is 12 and its mass number is 24. The number of electrons, protons and neutrons respectively will be
12, 12, 24
24,12,12
12,12,12
12, 24,12
9.
Which of the following statement regarding an atom is always correct?
An atom has equal number of electrons and protons
An atom has equal number of electrons and neutrons
An atom has equal number of electrons, protons and neutrons
An atom has equal number of protons and neutrons
10.
Identify the 'hetero nuclear tri atomic molecule' among the following.
P4
H2SO4
CO2
O3
11.
Atoms of different elements with different atomic numbers, but same mass number are known as _________
isobars
isotopes
isotones
isomers
12.
1 mole of any substance contains __________ molecules
6.023 × 1023
6.023 × 10-23
3.0115 × 1023
12.046 × 1023
13.
The volume occupied by 1 mole of a diatomic gas at S.T.P is
11.2 liters
5.6 liters
22.4 liters
44.8 liters
14.
Which of the following represents 1 amu?
Mass of a C – 12 atom
Mass of a hydrogen atom
1/12th of the mass of a C – 12 atom
Mass of O – 16 atom
15.
The volume occupied by 4.4 g of CO2 at S.T.P
22.4 liter
2.24 liter
0.24 liter
0.1 liter
1.
(b)
3.0115 x 1023
2.
(b)
21
3.
(b)
Anion
4.
(d)
3.0115 x 1023
5.
(a)
6.023 x 1023
6.
(c)
6.023 x 1023
7.
(b)
they exist as isotopes
8.
(c)
12,12,12
9.
(a)
An atom has equal number of electrons and protons
10.
(c)
CO2
11.
(a)
isobars
12.
(a)
6.023 × 1023
13.
(c)
22.4 liters
14.
(c)
1/12th of the mass of a C – 12 atom
15.
(b)
2.24 liter
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
