8th Standard Syllabus & Materials
8th Standard
Tamilnadu 8th Standard கணிதம் இயற்கணிதம் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard கணிதம் எண்கள் Important Questions And Answers Study Material - QB365 Set B
NEW8th Standard
Tamilnadu 8th Standard கணிதம் எண்கள் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
Tamilnadu 8th Standard Social Science பொருளியல் - பொது மற்றும் தனியார் துறைகள் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science குடிமையியல் - நீதித்துறை Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science குடிமையியல் - பாதுகாப்பு மற்றும் வெளியுறவுக் கொள்கை Important Questions And Answers Study Material - QB365
Published on: 13/05/2022
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Questions + Answers key
Take MCQ Science Test1.
Give an example to show that light travels faster than sound?
2.
What is an ultrasonic sound?
3.
Give two differences between music and noise.
4.
What is the frequency of a mechanical wave that has a velocity of 25 ms-1 and a wavelength of 12.5 m?
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.
Even though both thunder and lightning produced at same time, we can hear thunder after lightning.
2.
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.
3.
| 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 |
4.
Given Data.
Velocity = 25 mls.
Wavelength = 12.5 m
Frequency = ?
Frequency = \(\cfrac { velocity }{ wavelength } \)
= \(\cfrac { 25 }{ 12.5 } \)
=2Hz
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
Tamilnadu 8th Standard Social Science புவியியல் - புவிப்படங்களைக் கற்றறிதல் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - கண்டங்களை ஆராய்தல் (ஆப்பிரிக்கா, ஆஸ்திரேலியா மற்றும் அண்டார்டிகா) Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - தொழிலகங்கள் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science வரலாறு - காலங்கள் தோறும் இந்தியப் பெண்களின் நிலை Important Questions And Answers Study Material - QB365
Tamilnadu Stateboard 8th Standard Subjects
Tamilnadu Stateboard Standards
