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: 09/12/2020
9th Standard Science Atomic Structure English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021
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.
Our bodies contain radioisotopes such as ___________which continuously emit radiation.
Potassium 40
Iodine 131
Cobalt 60
Carbon 14
2.
Elements which have valence electrons 1 or 2 or 3 are ____________
metal
non-metal
rare metal
valuable metal
3.
The outermost shell of an atom is called its________ shell.
inner
outer
valence
sub shell
4.
Protons and neutrons are collectively called as ________
mesons
neutrino
Nucleons
Positrons
5.
Maximum number of electrons that can be accommodated in an energy level is given by the formula ___________
n2
2n2
3n2
2n3
6.
Most of the fast moving \(\alpha \) particles passed straight through the gold foil explains __________
An atom has nucleus
There is a large empty space around the nucleus.
Electrons move in circular paths
Nucleus is in the centre
7.
The compounds N2O, NO2, N2O4, N2O5 explains___________ law.
Law of definite proportion
Law of multiple proportion
Law of reciprocal proportion
Law of conservation of mass
8.
Law of multiple proportions was proposed by _________
J. Ritcher
Rutherford
John Dalton
J.J Thomson
9.
The correct electronic configuration of potassium is
2,8,9
2,8,1
2,8,8,1
2,8,8,3
10.
The term nucleons refer to
Protons and electrons
only Neutrons
electrons and neutrons
Protons and neutrons
1.
(a)
Potassium 40
2.
(a)
metal
3.
(c)
valence
4.
(c)
Nucleons
5.
(b)
2n2
6.
(b)
There is a large empty space around the nucleus.
7.
(b)
Law of multiple proportion
8.
(c)
John Dalton
9.
(c)
2,8,8,1
10.
(d)
Protons and neutrons
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
