Course Content
UPSC Notes Samples
Full Syllabus Covered | 100% as per Official UPSC Syllabus
0/46
1. Art & Culture Sample
Covered under topic 1. Indian culture will cover the salient aspects of Art Forms, Literature and Architecture from ancient to modern times.
0/67
1. Indian culture will cover the salient aspects of Art Forms, Literature and Architecture from ancient to modern times. (copy)
0/67
2. Modern Indian history from about the middle of the eighteenth century until the present- significant events, personalities, issues. (copy)
0/66
5. History of the world will include events from the 18th century such as Industrial revolution, World wars, Redrawal of national boundaries, Colonization, Decolonization, Political philosophies like Communism, Capitalism, Socialism etc.- their forms and effect on the society.
0/59
7. Role of women and women’s organizations, Population and associated issues, Poverty and developmental issues, Urbanization, their problems and their remedies.
0/41
10.2. Introduction to Maps
0/1
GS2
All topics that need updates are given below.
2. Functions and responsibilities of the Union and the States, issues and challenges pertaining to the federal structure, devolution of powers and finances up to local levels and challenges therein.
All topics that need updates are given below.
0/36
5. Parliament and State Legislatures – structure, functioning, conduct of business, powers & privileges and issues arising out of these.
All topics that need updates are given below.
0/31
6. Structure, organization and functioning of the Executive and the Judiciary; Ministries and Departments of the Government; pressure groups and formal/informal associations and their role in the Polity.
All topics that need updates are given below.
0/47
12. Welfare schemes for Vulnerable Sections of the Population by the Centre and States and the Performance of these schemes; Mechanisms, Laws, Institutions and Bodies constituted for the Protection and Betterment of these Vulnerable Sections.
All topics that need updates are given below.
0/33
GS3
All topics that need updates are given below.
11. Science and Technology- developments and their applications and effects in everyday life.
0/1
GS3: BIODIVERSITY AND ENVIRONMENT
All topics that need updates are given below.
1. Environment
0/151
GS4
All topics that need updates are given below.
GS3: SCIENCE AND TECHNOLOGY
All topics given below
0/1
1. Motion & Measurements
0/46
9. Metals & Non-Metals
0/23
10. Energy
0/49
12. Plant Organisms
0/33
14. Life Processes
0/42
18. Biotechnology
0/88
19. Information Technology
0/59
20. Space Technology
0/64
National & International Current Affairs (CA) 2025
Current affairs of all months are given below
delete UPSC Sample Notes [English]

ii.2. Can Atoms and Molecules explain the Laws of Conservation of Mass and Definite Proportions in Chemical Combinations?

The following two laws were established after much experimentation by Lavoisier and Joseph L. Proust.

Law of Conservation of Mass in Chemical Transformations:

  • It states that mass can neither be created nor destroyed in a chemical reaction.

Law of Constant Proportions or the law of definite proportions  in Chemical Compounds:

  • Developing Understanding: Lavoisier, along with other scientists, noted that many compounds were composed of two or more elements and each such compound had the same elements in the same proportions, irrespective of where the compound came from or who prepared it. 
  • Statement: This law was stated by Proust as “In a chemical substance the elements are always present in definite proportions by mass”. 
    • Example: In a compound such as water, if 9 g of water is decomposed, 1 g of hydrogen and 8 g of oxygen are always obtained i.e the ratio of the mass of hydrogen to the mass of oxygen is always 1:8. 
    • Similarly in ammonia, nitrogen and hydrogen are always present in the ratio 14:3 by mass. 

To explain this, British chemist John Dalton provided the basic theory about the nature of matter.