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Published on: 02/09/2019
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Download Tamil Nadu 7th 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.
Which of the following is a short and scientific way of representing one molecule of an element or compound?
Mathematical formula
Chemical formula
Mathematical symbol
Chemical symbol
2.
Which one of the following is an example for a metal?
Iron
Oxygen
Helium
Water
3.
Elements are the________ form of pure substances.
4.
________of some elements are derived from Latin or Greek names of the elements.
5.
The smallest particle of matter that can exist by itself is ______.
6.
Classify the following as metals, non-metals and metalloids .
Sodium, Bismuth, Silver, Nitrogen, Silicon, carbon, chlorine, Iron, copper.
7.
Write the chemical formula and name the elements present in the following compounds:
a. Sodium chloride
b. Potassium hydroxide
c. Carbon dioxide
d. Calcium oxide
e. Sulphur dioxide
8.
What is atomicity of elements?
9.
Give an example for the elements derived from their Latin names
10.
Write the chemical formula for the following elements
a. Hydrogen
b. Nitrogen
c. Ozone
d. Sulphur
11.
Differentiate between elements and compounds
12.
Differentiate metals and non metals.
13.
Assertion: Oxygen is a compound.
Reason: Oxygen cannot be broken down into anything simpler
a. Both assertion and reason are true and reason is the correct explanation of assertion.
b. Both assertion and reason are true, but reason is not the correct explanation of assertion.
c. Assertion is true but reason is false.
d. Assertion is false but reason is true.
1.
(b)
Chemical formula
2.
(a)
Iron
3.
( )
simplest
4.
( )
The Symbol
5.
( )
atom
6.
Metals: Sodium, Bismuth, Silver, Iron, Copper.
Non-metals: Nitrogen, Carbon, Chlorine.
Metalloids: Silicon.
7.
| Compound | Chemical fromula | Name of the elements | |
| a. | Sodium chloride | NaCI | Sodium (Na), Chlorine (CI) |
| b. | Potassium hydroxide | KOH | Potassium (K), Oxygen (O), Hydrogen(H) |
| c. | Carbon dioxide | CO2 | Carbon (C), Oxygen (O2) |
| d. | Calcium oxide | CaO | Calcium (C), Oxygen (O2) |
| e. | Sulphur dioxide | SO2 | Sulphur (S), Oxygen (O2) |
8.
The total number of atoms present in one molecule of an element, Compound or a substance is called atomicity
9.
| Name | Latin Name | Symbol |
| Copper | Cuprum | Cu |
| Gold | Aurum | Au |
| Potassium | Kalium | K |
10.
| Elements | Chemical Formula |
| Hydrogen | H2 |
| Nitrogen | N2 |
| Ozone | O3 |
| Sulphur | S8 |
11.
| Elements | Compunds |
| (i) An element is the simplest substance | (i) They formed by the cornbination of two or more elements. |
| (ii) They combine to form compounds | (ii) They can be splited into elements. |
| (iii) Atoms are the fundamental particle of an element | (iii) Molecules are the fundamental particles of a compound. |
12.
| Metals | Non-metals |
| (i) Lustrous and have shiny surface. | (i) Non-lustrous and have non-shiny surface. |
| (ii) They are generally hard. | (ii) They are generally Soft. |
| (iii) They are ductile. | (iii) They are non-ductile. |
| (iv) Good conductors of heat and electricity. | (iv) Bad conductors of heat and electricity. |
| (v) Metals are making sound when struck.(Sonorous) | (v) Non-metals do not make sound when struck. (Non-sonorous) |
13.
d. Assertion is false but reason is true.
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
