8th 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: 08/08/2019
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.
Binominal Nomenclature was first introduced in the year of
1970
1975
1978
1623
2.
Pencil lead contains
graphite
diamond
aluminium
sulphur
3.
Matter is composed of
atoms
molecules
ions
all of the above
4.
Unit of pressure is
pascal
Nm–2
poise
Both (a) & (b)
5.
SI unit stands for
International system of units
Integrated System of units
International symbol of units
Integrated symbol of units
6.
Which one the following systems of unit is the British System of unit?
CGS
MKS
FPS
SI
7.
The size of the cells are measured in units of __________.
8.
The first true land plant is ______
9.
The symbol of Tungsten is ________
10.
_______ is used to measure electric current.
11.
In gymnosperms ovules are developed from the flowers.
12.
Yeast is used in the large scale production of alcohol.
13.
CFC is a pollutant.
14.
A body will sink if the weight of the body is greater than the buoyant force.
15.
SI units are metric system of units.
16.
Amino acids
17.
Tungsten
18.
Multiple reflection
19.
Lubricants
20.
Plane Angle
21.
The radius of curvature of a spherical mirror is 20 cm. Find its focal length.
22.
What is cell differentiation?
23.
Who discovered penicillin?
24.
Define catalysis
25.
Give two examples for metalloids.
26.
What is the unit of mass in FPS system?
27.
Define focal length?
28.
Why is a ball bearing used in a cycle hub?
29.
Define - mole.
30.
Differentiate between inhalation and exhalation.
31.
Explain the three types of pollution.
32.
List out the base quantities with their units.
33.
Calculate the pressure exerted by the foot of an elephant using the following data. Average weight of an elephant is 4000 N. Surface area of the sole of its foot is 0.1m2.
1.
(d)
1623
2.
(a)
graphite
3.
(d)
all of the above
4.
(d)
Both (a) & (b)
5.
(a)
International system of units
6.
(c)
FPS
7.
( )
Micron
8.
( )
pteridophytes
9.
( )
ω
10.
( )
Ammeter
11.
(b)
12.
(a)
13.
(a)
14.
(a)
15.
(a)
16.
enzymes, hormone, protein
17.
Making the filament of a bulb
18.
Kaleidoscope
19.
reduce friction
20.
Angle formed by the intersection of two planes
21.
Radius of curvature = 20 cm
Focal length (f) =\(\frac { Radius\quad of\quad curvat }{ 2 } \)
=\(\frac { R }{ 2 } =\frac { 20 }{ 2 } \)=10 cm
22.
► Th foetus consists of multitude of cells of different shape, size and content.
► Foetal cells gradually attain change in structure and function.
► This process is known as cell differentiation.
23.
Sir Alexander Fleming discovered penicillin
24.
Chemical substance used to alter the speed of the reaction is called a catalyst and the process is called catalysis.
25.
Two examples for metalloids are Germanium, Boron, Silicon
26.
Pound
27.
The distance between the pole and the principle focus is called focal length (f) of a spherical mirror.
28.
i) The rolling friction is smaller than sliding friction
ii) By using ball bearings sliding friction is replaced by rolling friction
iii) A ball bearing is used in a cycle hub to reduce friction.
29.
Mole is defined as The amount of substance which contains 6.023 x 1023 entities.
30.
| S.No | Inhalation | Exhalation |
|---|---|---|
| 1. | The muscles of the diaphragm | The muscles of the diaphram relax. |
| 2. | The diaphram goes downward. | The diaphram goes upwards |
| 3. | The ribs move upwards and outwards. | The ribs move downwards. |
| 4. | The volume of thoracic cavity increases. | the volume of thoracic cavity decreases. |
| 5. | air enteres the lungs through the nose | Air goes out of the lungs through the nose. |
31.
| S.No | Type of pollution | Chemical substances responsible for the pollution | Effects |
|---|---|---|---|
| 1 | Air pollution | Carbon dioxide, Carbon monoxide, oxides of sulphur, oxides of nitrogen, Chlorofluorocarbons, methane etc. | Acid rain, Global warming, respiratory problems etc |
| 2 | Water pollution | Wastewater containing chemical substances (eg. dyeing industries), detergents, oil spillage etc. | Decrease in quality of water, skin diseases etc |
| 3 | Land pollution | Fertilizers like urea, various pesticides, herbicides etc | Spoilage of land, cancer, respiratory diseases etc. |
32.
| Quanitity | Unit | Symbol |
| Length | Metre | m |
| Mass | Kilogram | kg |
| Time | Second | s |
| Temperature | Kelvin | K |
| Electric current | Ampere | A |
| Amount of substance | Mole | mol |
| Luminous intensity | Candela | cd |
33.
Average weight of the elephant = 4000 N
Weight of one leg = force exerted by one leg = 4000/4 = 1000 N
Area of the sole of one foot = 0.1 m2.
Pressure = \(\frac { Force }{ Area } =\frac { 1000 }{ 0.1 } \) =10000\(\frac { N }{ { m }^{ 2 } } \)=104 Nm-2
Pressure exerted by one leg of the elephant is 10,000 newton on one square metre.
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
