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Published on: 05/12/2020
10th Standard Science Atoms and Molecules English Medium Free Online Test 1 Mark Questions 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.
Isotopes have
Same physical properties and different chemical properties
Same chemical properties and different physical properties
Same physical and chemical properties
Different physical and chemical properties
2.
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
3.
The total number of atoms represented by the compound CuSO4. 5H2O is
27
21
5
8
4.
5.
The formula of a chloride of a metal M is MCl3 the formula of the phosphate of metal M will be:
MPO4
M2PO4
M3PO4
2 (PO4)3
6.
Which of the following has largest number of particles?
8g of CH4
4.4g of CO2
34.2g of C12H22P11
2g of H2
7.
What mass of hydrogen and oxygen will be produced on complete electrolysis of 18 g of water
2 g hydrogen and 32 g oxygen
2 g hydrogen and 16 g oxygen
4 g hydrogen and 32 g oxygen
4 g hydrogen and 14 g oxygen
8.
9.
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
10.
Mass of an electron is
9.1083 x 10-31kg
9.1083 x 10-24kg
1.67262 x 10-27kg
1.67 x 10-24gm
11.
Mass number is the
Number of protons
Sum of protons and electrons
Number of neutrons
Sum of protons and neutrons
12.
Pick out the isotopes among the following pairs
6C13, 7N14
18Ar4, 20Ca4
6C12, C614
5B12, 6C13
13.
In the nucleus of 20Ca40, there are
20 protons and 40 neutrons
20 protons and 20 neutrons
20 protons and 40 electrons
40 protons and 20 electrons
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.
Which of the following has the smallest mass?
6.023 × 1023 atoms of He
1 atom of He
2 g of He
1 mole atoms of He
1.
(b)
Same chemical properties and different physical properties
2.
(b)
3.0115 x 1023
3.
(b)
21
4.
(b)
5.
(a)
MPO4
6.
(d)
2g of H2
7.
(b)
2 g hydrogen and 16 g oxygen
8.
(c)
9.
(b)
they exist as isotopes
10.
(a)
9.1083 x 10-31kg
11.
(d)
Sum of protons and neutrons
12.
(c)
6C12, C614
13.
(b)
20 protons and 20 neutrons
14.
(c)
1/12th of the mass of a C – 12 atom
15.
(b)
1 atom of He
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
