Matter Around Us

Samacheer Book Back Questions And Answers For Science Standard 8 “Matter Around Us“

I. Choose the best answer:
1. The liquid metal used in thermometers is
a) copper
b) mercury
c) silver
d) gold

2. The pictorial symbol for water given by the alchemists was

Answer: c)

3. Which one of the following element name is not derived from planet?
a) Plutonium
b) Neptunium
c) Uranium
d) Mercury

4. Symbol of mercury is
a) Ag
b) Hg
c) Au
d) Pb

5. A form of non-metal which has high ductility is
a) nitrogen
b) oxygen
c) chlorine
d) carbon

6. The property which allows the metals to be hammered into their sheets is _____.
a) ductility
b) malleability
c) conductivity
d) shining strength

7. The non-metal which conducts electric current is
a) carbon
b) oxygen
c) aluminium
d) sulphur

8. Pencil lead contains
a) graphite
b) diamond
c) aluminium
d) sulphur

9. Identify the state of matter based on the arrangement of the molecules.

a) A – Gas, B – Solid, C – Liquid
b) A – Liquid, B – Solid, C – Gas
c) A – Gas, B – Solid, C – Liquid
d) A – Liquid, B – Gas, C – Solid

II. Fill in the blanks:
1. The element which possesses the character of both metals and non metals are called _____.
2. The symbol of tungsten is _____.
3. Melting point of most metal is _____ than non-metal.
4. Water contains _____ and _____ element.
5. _____ is used as semiconductor.

Answers:
1. metalloids
2. W
3. higher
4. hydrogen and oxygen
5. Silicon / Germanium

III (A) Match the following:
1. Iron              A. For making wires
2. Copper         B. Sewing needle
3. Tungsten      C. As a fuel for ignition in rocket
4. Boron           D. Making the filament of a bulb

Answers:
1. B
2. A
3. D
4. C

III (B) Match the following:
1. Atom               A. Building block of matter
2. Element           B. Atoms of different kinds
3. Compound      C. Atoms of the same kind
4. Molecule         D. Smallest unit of a substance

Answers:
1. A
2. C
3. B
4. D

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