9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -விரிவானம் (துணைப்பாடம்) - தாய்மைக்கு வறட்சி இல்லை! Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கவிதை பேழை (செய்யுள்) - மார்கழி பெருவிழா Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர்-துணைப்பாடம் - ஆறாம்திணை 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 9 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 9th 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.
A body of voloume 100 cc is immersed completely in water contained in a jar. The weight of water and the jar before immersion of the body was 700 g. Calculate the weight of water and jar after immersion.
2.
What is meant by atmospheric pressure?
3.
Why does a helium balloon float in air?
4.
Calculate the apparent weight of wood floating on water if it weighs 100g in air.
5.
A block of wood of weight 200 g floats on the surface of water. If the volume of block is 300 cm3 calculate the upthrust due to water.
1.
Before the body is immersed,
The weight of water and jar = 700 grams.
A body of volume 100cc is immersed in water in the jar.
The weight of body = 100 grams.
Because 1cc = 19m.
(Since 51 unit for volume is 1m3 = 1000000 grams or 1000000 cc)
The weight of the water and jar after immersion = 700g + 100g = 800g or 0.8kg.
2.
The layer of the air around the earth upto certain height of about 300 km, is called as the atmosphere of the earth. Since air occupies space and has weight, it also exerts pressure. This pressure is called atmospheric pressure.
3.
Helium in the balloon is lighter than the air around it, it receives an upward thrust known as buoyancy. Because helium weighs less than the amount of air it has displaced. So it floats.
4.
Wood piece of mass 100g floating in water, it will experience an upthrust due to water displaced by the immersed part of the of the wood.
For a floating body, upthrust will be equal to the weight of the body. Therefore the apparent weight of the body will be zero.
(ie. the weight of the body in air - upthrust)
5.
Density of water (p) = 1000 km/m3
Volume of block (v) = 300 cm3 = 300 x 10-6 m3
Gravitational force (g) = 10 ms-2
Up thrust = pgv
= 1000 x 10 x 300 x 10-6
= 3000000 x 10-6 (10-6 = 1000000)
\(\frac{3000000}{1000000}\)
Upthrust due to water = 3N
9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - மணிமேகலை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - ஏறு தழுவுதல் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர் - தண்ணீர் Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
