100% FREE ACCESS8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - வினைமுற்று Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - மயங்கொலிகள் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை -பட்டமரம் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - இயற்கையை போற்றுவோம் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 1 - தமிழ் இன்பம் - ஆழிக்கு இணை Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 2-ஈடில்லா இயற்கை - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
Published on: 29/07/2019
Matter
Download Tamil Nadu 8th 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.
The non-metal which conduct current is
carbon
oxygen
aluminium
sulphur
2.
Which one of metal possess low tensile strength?
Silver
Copper
Zinc
Aluminium
3.
Symbol of Mercury is
Ag
Hg
Au
Pb
4.
The Pictorial symbol for water given by the alchemists was
5.
Matter is composed of
atoms
molecules
ions
all of the above
6.
_______is the hardest naturally occurring substance.
7.
_______is so hard that it can scratch glass.
8.
Water contains _______ and ______ element
9.
The symbol of Tungsten is ________
10.
The element which possess character of both metals and non metals are called_______.
11.
Sodium
12.
Compound
13.
Atom
14.
Tungsten
15.
Iron
16.
What is matter?
17.
Write three properties of metalloids.
18.
Give two examples for metalloids.
19.
Name two soft metals that can be cut with a knife.
20.
Write the symbols for these elements
a) Oxygen b) Gold
c) calcium d) cadmium e) Iron
21.
What is ductility?
22.
Name the metals that are used in jewellery.
23.
Name the elements for following symbols.
a) Na b) W c) Ba d) Al e) U
24.
Define tensile strength.
25.
Sodium bicarbonate; Baking Soda;Sodium Carbonate___________
26.
Mercury: liquid metal_________liquid non-metal
27.
write the uses of some metals
28.
Explain the physical properties of metals.
1.
(a)
carbon
2.
(c)
Zinc
3.
(b)
Hg
4.
(c)
5.
(d)
all of the above
6.
( )
Diamond
7.
( )
Osmium
8.
( )
Hydrogen and Oxygen
9.
( )
ω
10.
( )
metalloids
11.
Natrium
12.
Atoms of different kinds
13.
building block of matter
14.
Making the filament of a bulb
15.
Sewing needle
16.
Any thing which occupies space and has mass is called matter
17.
i) Metalloids are all solid at room temperature.
ii) Metalloids can form alloys with other metals.
iii) The physical properties of metalloids tend to be metallic but their chemical properties tend to be non-metallic
18.
Two examples for metalloids are Germanium, Boron, Silicon
19.
Two soft metals that can be cut with a knife are (i) Sodium and (ii) Potassium.
20.
| Element | Symbol | |
|---|---|---|
| a | Oxygen | O |
| b | Gold | Au |
| c | Calcium | Ca |
| d | Cadmium | Cd |
| e | Iron | Fe |
21.
Metals can be drawn into thin wires. This property of metals is called ductility.
Example: Copper wires.
22.
i) Metals like gold, silver, platinium, copper, titanium are used in making jewellery.
ii) Nowadays metals like Iron, nickel are used in making costume jewellery
23.
| Symbol | Name | |
| a | Na | Sodium |
| b | W | Tungsten |
| c | Ba | Barium |
| d | Al | Aluminium |
| e | U | Uranium |
24.
| S.No | Property | Metal | Non-metal |
| 1. | Malleability | Good | Poor-usually soft or brittle |
| 2. | Ductility | Good | Poor-Usually soft or brittle |
| 3. | Melting point | Usually high | Usually low |
| 4 | Boiling point | Usually high | Usually low |
25.
Washing soda
26.
Bromine
27.
| S.No | Metals | Uses |
|---|---|---|
| 1 | Iron | for making bridges, engine parts iron sheet and bars |
| 2 | Copper | electrical wires, coins, statues |
| 3 | Silver and gold | Jewels, decorative purposes, photo graphy |
| 4 | Mercury | thermometers and barometers |
| 5 | Aluminium | electrical wires, cables,aerospace industries |
| 6 | Lead | automobile batteries, X-ray machines |
28.
| S.No | Property | Metals | Exceptions |
|---|---|---|---|
| 1 | Physical State | Solids at room tempe | Mercury, Cesium Rubidiu Francium, Gallium liquids at or above room tempe |
| 2 | Hardness | Hard, Osmium can scratch glass | Sodium and potassium are soft |
| 3 | Lustre | Shiny | Calcium |
| 4 | Density | High | Sodium and potassium |
| 5 | Melting point & boiling point | High | Sodium potassium mercUT¥, gallium |
| 6 | Tensile strength | High | Zinc |
| 7 | Malleability | Malleable | - |
| 8 | Ductility | Ductile | - |
| 9 | Conductivity | Good conductors | Bismuth, tungsten |
| 10 | Sonorous | Governing sound | - |
8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - பாடறிந்து ஒழுகுதல் Important Questions And Answers Study Material - QB365 Set A
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TN 8th Tamil இயல் 3-கல்வி கரையில - புத்தியைத் தீட்டு Important Questions And Answers Study Material - QB365 Set A
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TN 8th Tamil இயல் 2 - ஈடில்லா இயற்கை - தமிழர் மருத்துவம் ( நேர்காணல்) Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 8th Standard Subjects
Tamilnadu Stateboard Standards
