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: 06/08/2019
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.
Assertion (A): Some algae are living as colonial form.
Reason (R): Some of the algae are Symbionts.
a. Both are correct
b. Both are wrong
c. A is correct R is wrong
d. A is wrong R is correct
2.
Assertion: Algae are heterotrophic.
Reason: They don’t have chlorophyll.
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.
3.
Assertion: Broad straps are used in bags.
Reason: Broad straps last for long life.
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. Both assertion and reason are false.
4.
Assertion: Avogadro’s number is the number of atoms in one mole of substance.
Reason: Avogadro’s number is a constant
a. If both assertion and reason are true and reason is the correct explanation of the assertion.
b. If both assertion and reason are true but reason is not the correct explanation of the assertion.
c. Assertion is true, but reason is false.
d. Assertion is false, but reason is true.
5.
Assertion: The SI system of units is the suitable system for measurements.
Reason: The SI unit of temperature is Kelvin.
a. Both assertion and reason are true and reason is the correct explanation of the assertion.
b. Both assertion and reason are true but reason is not the correct explanation of the assertion.
c. Assertion is true, but reason is false.
d. Both assertion and reason are false.
6.
Name some things which exert larger pressure on a smaller area?
7.
Who founded the Book "On Burning Mirrors"?
8.
What is rusting?
9.
What are metals?
10.
Define Arithmetic Logic Unit.
11.
Define SCP
12.
The radius of curvature of a spherical mirror is 20 cm. Find its focal length.
13.
What is cell differentiation?
14.
Write any two characters of dicotyledons.
15.
Who discovered penicillin?
16.
Name the bacteria used in the production of vinegar.
17.
Define catalysis
18.
Give two examples for metalloids.
19.
Name two soft metals that can be cut with a knife.
20.
Which has greater viscosity, oil or honey? Why?
21.
Give two examples to verify that a force changes the shape of a body.
22.
Mention the types of clocks based on their display.
23.
What is the unit of mass in FPS system?
24.
Explain why are you not able to breathe normally when you are in closed and crowded places?
25.
Refractive index of water is 4/3 and the refractive index of glass is 3/2. Find the refractive index of glass with respect to the refractive index of water.
1.
a. Both are correct
2.
(d) If both Assertion and Reason are false
3.
c. Assertion is true, but reason is false.
4.
a. If both assertion and reason are true and reason is the correct explanation of the assertion.
5.
b. Both assertion and reason are true but reason is not the correct explanation of the assertion.
6.
Axe, nail, knife, injection needle, bullet.
7.
Mathematician Diodes.
8.
Rusting is a chemical reaction in which iron objects form hydrated ferric oxide in the presence of oxygen and water.
9.
Elements which are shiny, hard and good conductors of heat and electricity are called metals
10.
Arithmetic and Logic unit performs all the arithmetic computations like addition, subtraction, multiplication and division.
11.
Some of the single cell algae and blue green algae are used to produce protein. Eg: Chlorella, Spiralina
12.
Radius of curvature = 20 cm
Focal length (f) =\(\frac { Radius\quad of\quad curvat }{ 2 } \)
=\(\frac { R }{ 2 } =\frac { 20 }{ 2 } \)=10 cm
13.
► 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.
14.
Characters of dicotyledons:
i) Seed has two cotyledons
ii) Plants have tap root system, leaves with reticulate venation
15.
Sir Alexander Fleming discovered penicillin
16.
Acetobacter is a genus of bacteria that oxidize ethanol and produce acetic acid.
17.
Chemical substance used to alter the speed of the reaction is called a catalyst and the process is called catalysis.
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.
Honey. Honey flows slower than oil. So it has greater viscosity.
21.
i) When force is exerted on raw rice, it gets grind to form rice flour
ii) When force is exerted on an inflated balloon at different angles, the shape of the balloon gets changed.
22.
1. Analog clocks
2. Digital clocks.
23.
Pound
24.
In a closed room there will be poor ventilation. The oxygen in the closed room or crowded area will be used up by the people. As a respiration the concentration of carbon di oxide in air increases. There will no supply of oxygen. As oxygen is necessary for respiration we feel suffocated in closed and crowded places.
25.
wμg = \(\frac { Refractive\ index\ of\ glass }{ Refractive\ index\ of\ water } \)
\(=\frac { \frac { 3 }{ 2 } }{ \frac { 4 }{ 3 } } =\frac { 9 }{ 8 } \)=1.125
8th Standard Syllabus & Materials
8th Standard
TN 8th Tamil இயல் 3 - கல்வி கரையில - பாடறிந்து ஒழுகுதல் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 3-கல்வி கரையில - பல்துறைக் கல்வி Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
TN 8th Tamil இயல் 3-கல்வி கரையில - புத்தியைத் தீட்டு Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
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
