Matter Around Us Book Back Questions 8th Science Lesson 9
8th Science Lesson 9
9] Matter Around Us
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
| Compounds | Common name |
| Copper sulphate | Blue Vitriol |
| Ferrous sulphate | Green Vitriol |
| Potassium nitrate | Saltpetre |
| Sulphuric acid | Oil of Vitriol |
| Calcium sulphate | Gypsum |
| Calcium sulphate hemi hydrate | Plaster of Paris |
| Potassium chloride | Muriate of potash |
Choose the best answers:
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
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 – Gas
(d) A – Liquid, B – Gas, C – Solid
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.
Match the following:
(a)
1. Iron – for making wires
2. Copper – sewing needle
3. Tungsten – as a fuel for ignition in rocket
4. Boron – making the filament of a bulb
(b)
1. Atom – building block of matter
2. Element – atoms of different kinds
3. Compound – atoms of the same kind
4. Molecule – smallest unit of a substance
Answers:
Choose the best answers:
1. Mercury 2. 
3. Mercury 4. Hg 5. Carbon 6. Malleability 7. Carbon
8. Graphite 9. A – Gas, B – Solid, C – Liquid
Fill in the blanks:
1. Metalloids 2. W 3. Higher 4. Hydrogen, Oxygen 5. Silicon/ Germanium
Match the following:
a)
1.Iron- Sewing needle
2.Copper- For making wires
3.Tungsten- Making the filament of a bulb
4.Boron- As a fuel for ignition in rocket
b)
1.Atom- Building block of matter
2.Element- Atoms of same kinds
3.Compound- Atoms of different kinds
4.Molecule- Smallest unit of a substance