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: 13/05/2022
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latest Book back QuestionsDownload 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.
State the Snell’s law of refraction
2.
State the laws of reflection.
3.
Give two applications of a concave and convex mirror.
4.
Define focal length?
5.
If two plane mirrors are inclined to each other at an angle of 45°, find the number of images formed.
1.
i) The incident ray, the reflected ray and the normal at the point of intersection all lie in the same plane.
ii) The ratio of the sine of the angle of incidence (i) to the sine of the angle of refraction (r) is equal to the refractive index of the medium, which is a constant.
\(\frac { \sin\ i }{ \sin\ r } \)= μ
2.
i) The incident ray, the reflected ray and the normal at the point of incidence, all lie in the same plane.
ii) The angle of incidence and the angle of reflection are always equal.
3.
Applications of a concave mirror:
i) Used as shaving mirror as they provides magnified image
ii) Used in torches, search lights as they direct the light to a long distance.
Applications of a convex mirror:
i) Used in vehicles as rear view mirror
ii) Used on roads where there are sharp curves and turns
4.
The distance between the pole and the principle focus is called focal length (f) of a spherical mirror.
5.
Angle of inclination (θ) = 45o
Number of images formed = \(\frac { { 360 }^{ o } }{ \theta } \)-1
= \(\frac { { 360 }^{ o } }{ { 45 }^{ o } } \)-1 = 8-1 = 7
Number of images = 7
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
