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.
Give two differences between music and noise.
2.
To increase the loudness of sound by four times, how much should the amplitude of vibration be changed?
3.
What is vibration?
4.
A wave with a frequency of 500 Hz is traveling at a speed of 200 ms-1. What is the wavelength?
5.
A sound wave travels 2000 m in 8 s. What is the velocity of the sound?
1.
| 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 |
2.
Loudness ∝ amplitude2
Amplitude ∝ \(\sqrt{Loudness} \)
Amplitude ∝ \(\sqrt{4} \)
Amplitude is increased by 2 times.
3.
i) Vibration is a kind of rapid to and fro motion of an object.
ii) This to and fro motion of the body causes the substances around it to vibrate.
4.
\(\mathrm{v} =200 \mathrm{~ms}^{-1} \quad \mathrm{n}=500 \mathrm{~Hz} \)
\(\mathrm{v} =\mathrm{n} \lambda \)
\(\lambda =\mathrm{v} / \mathrm{n} \)
\(=200 / 500=0.4 \)
\(\lambda =0.4 \mathrm{~m} \text { or } 40 \mathrm{~cm} \)
5.
\(\mathrm{d}=2000 \mathrm{~m} \mathrm{t}=8 \mathrm{~s}\)
\(\mathrm{v}= distance/time =\mathrm{d} / \mathrm{t}\)
\(\mathrm{v}=2000 / 8=250\)
\(\mathrm{v}=250 \mathrm{~ms}^{-1}\)
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
