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: 16/06/2021
QB365 provides detailed and simple solution for every Book back Questions in class 8 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
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.
What is the frequency of a mechanical wave that has a velocity of 25 ms-1 and a wavelength of 12.5 m?
2.
Give two differences between music and noise.
3.
What is an ultrasonic sound?
4.
Give an example to show that light travels faster than sound?
5.
Ruthvik and Ruha hear a gunshot 2 seconds after it is fired. How far away from the gun they are standing? (Speed of sound in air is equal to 330ms-1)
1.
Given Data.
Velocity = 25 mls.
Wavelength = 12.5 m
Frequency = ?
Frequency = \(\cfrac { velocity }{ wavelength } \)
= \(\cfrac { 25 }{ 12.5 } \)
=2Hz
2.
| Music | Noise |
| Pleasant to the ear. | unpleasant to the ear. |
| Produced by the regular and periodic vibration | Produced by the irregular and non-periodic vibration |
3.
i) A sound with a frequency greater than 20000 Hz is called as ultrasonic sound.
ii) Animals such as bats, dogs, dolphins etc., are able to hear certain ultrasonic sounds.
4.
Even though both thunder and lightning produced at same time, we can hear thunder after lightning.
5.
\(v =331 \mathrm{~ms}^{-1} t=2 \mathrm{~s} \)
\(v =\text { distance } \text { time }=\mathrm{d} / \mathrm{t} \)
\(\mathrm{d} =v \times \mathrm{t} \)
\(=330 \times 2=660 \)
\(\mathrm{v} =660 \mathrm{~m} \)
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
