Philosophy Optional · Paper I · Western Philosophy

Rationalism: Descartes, Spinoza, Leibniz Notes · PYQs

Free notes and every UPSC previous year question for Rationalism: Descartes, Spinoza, Leibniz, Unit 02 of Paper I, Section A: the official syllabus, 8 topic-wise notes in syllabus order, and all 55 questions from 1990 to 2026 grouped by sub-topic.

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55

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25

Asked since 2013

1990–2026

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Official UPSC syllabus

Rationalism: Descartes, Spinoza, Leibniz: syllabus

The syllabus text for this unit in Paper I, Section A (Western Philosophy) of Philosophy Optional. Every note and question on this page maps to it.

Cartesian Method and Certain Knowledge; Substance; God; Mind-Body Dualism; Determinism and Freedom.

Paper I · Section A · Unit 02

Rationalism: Descartes, Spinoza, Leibniz notes

Topic-wise notes for this unit in syllabus order, written for UPSC Mains in plain language, with diagrams and the previous year questions on each topic.

Free notes

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Previous year questions: Rationalism: Descartes, Spinoza, Leibniz

All 55 questions UPSC has set from this unit between 1990 and 2026, grouped by sub-topic with the most-asked first, newest first within each. Questions from 2013 onwards are shown; earlier ones open on a tap.

How often UPSC asks each sub-topic

Sub-topic	Questions	Since 2013	Last asked
Spinoza · Substance	11	4	2025
Leibniz · Monads	7	1	2026
Descartes · Method	5	2	2025
Spinoza · Freedom	5	3	2023
Descartes · Cogito	5	2	2022
Leibniz · Harmony	5	3	2020
Descartes · Dualism	5	1	2014
Rationalists · Comparative	4	3	2024
Descartes · Knowledge	3	3	2023
Leibniz · Indiscernibles	2	2	2015
Descartes · God	2	0	2011
Spinoza · Mind-Body	1	1	2026

Spinoza · Substance

11 questions · 4 since 2013 · last asked 2025

Asked since 2013 · 4

2025“All determination is negation.” Comment with reference to Spinoza. (15 marks)
2024How does Spinoza establish that God alone is absolutely real with his statement— “Whatever is, is in God”? Critically discuss. (15 marks)
2022Discuss the concept of substance according to Spinoza. Does his discussion on substance lead to pantheism? Substantiate your view. (15 marks)
2020“From the necessity of the divine nature there must follow infinitely many ways.” Explain this statement by Spinoza along with some possible criticisms. (15 marks)

Show 7 earlier questions (before 2013)

1997–2012 · 7 questions

2012If ‘every determination is negation’ then how can Substance have attributes? Explain (15 marks)
2010Why does Spinoza think that God alone is absolutely real? Explain (20 marks)
2006Explain Spinoza’s theory of Substance (60 marks)
2005Spinoza’s conception of the Ultimate Substance (20 marks)
2002State and critically examine Spinoza’s doctrine of the identity of the Substance, God and nature (60 marks)
1998Explain Spinoza’s concept of the Absolute and compare it with the Brahman of Samkara (60 marks)
1997Explain the nature of substance and its relation to attributes according to Spinoza (60 marks)

Leibniz · Monads

7 questions · 1 since 2013 · last asked 2026

Asked since 2013 · 1

2026Compare and contrast the notion of entelechy as presented in Aristotle’s and Leibniz’s philosophy. (10 marks)

Show 6 earlier questions (before 2013)

1990–2012 · 6 questions

2012Does Monadology sufficiently explain the nature of Substance? Are monads independent of each other? Explain (15 marks)
2009Compare the views of Leibnitz and Hume on the concept of substance (30 marks)
2008Explain Leibnitz’s notion of monad. Can monad be regarded as a basic particular in the Strawsonian sense? (60 marks)
2000Monadology of Leibniz (20 marks)
1999The monadism of Leibniz is the climax of the western rationalistic thought.” Present your own view after discussing this statement (60 marks)
1990Explain the views of Leibniz concerning substances, called monads (60 marks)

Descartes · Method

5 questions · 2 since 2013 · last asked 2025

Asked since 2013 · 2

2025What are the basic tenets of Rationalism? How does Descartes build a system of Philosophy in consonance with them? Discuss. (20 marks)
2013Explain Descartes’ method of doubt. Can this method be used to justify his belief in the existence of God? Argue your case. (12.5 marks)

Show 3 earlier questions (before 2013)

1990–2000 · 3 questions

2000Descartes’ method of doubt (20 marks)
1998Explain Cartesian method and evaluate its contribution to the development of human knowledge (60 marks)
1990Descartes Method of Doubt (20 marks)

Spinoza · Freedom

5 questions · 3 since 2013 · last asked 2023

Asked since 2013 · 3

2023“That thing is said to be free which exists solely from the necessity of its own nature, and is determined to action by itself alone-” Discuss Spinoza’s views on freedom and determinism in the light of the above statement. (10 marks)
2019What do you understand by Spinoza’s statement that what is, cannot be other than what it is? Explain. (15 marks)
2013Write a short critical essay on Spinoza’s conception of freedom of the individual. (12.5 marks)

Show 2 earlier questions (before 2013)

2009–2011 · 2 questions

2011Is the concept of freedom consistent with the theory of determinism of Spinoza? Support your answer with arguments (30 marks)
2009Compare the views of Spinoza and Sartre on Freedom (30 marks)

Descartes · Cogito

5 questions · 2 since 2013 · last asked 2022

Asked since 2013 · 2

2022How does Rene Descartes explain the notion of certainty with reference to knowledge of the self? Critically discuss the way it differs from the knowledge of the world. (15 marks)
2015Does Descartes Cogito principle entail that he is an essentialist? Discuss. (15 marks)

Show 3 earlier questions (before 2013)

1997–2012 · 3 questions

2012How does Descartes’ ‘ cogito ergo sum’ affect Hume and Kant’s transcendental philosophy? Explain (12 marks)
2004I think, therefore I am (20 marks)
1997I think, therefore I am. (20 marks)

Leibniz · Harmony

5 questions · 3 since 2013 · last asked 2020

Asked since 2013 · 3

2020How does Leibniz’s conception of monads bear upon his views on determinism and freedom? Discuss with your own comments. (10 marks)
2018Is there any place for freedom in Leibniz’s philosophy, when he speaks of “pre-established harmony’? Discuss. (10 marks)
2014Does Leibniz’s theory of pre-established harmony necessarily lead to determinism ? Discuss. (10 marks)

Show 2 earlier questions (before 2013)

1992–2012 · 2 questions

2012Does Leibnitz succeed in combining the mechanical with the teleological view of the world? Explain his theory of Pre- Established Harmony (15 marks)
1992Everything in the universe is so perfectly timed and so harmonious : God must be a mathematician (20 marks)

Descartes · Dualism

5 questions · 1 since 2013 · last asked 2014

Asked since 2013 · 1

2014Explain the doctrine of Cartesian dualism and examine critically arguments in favour of it. (15 marks)

Show 4 earlier questions (before 2013)

1998–2009 · 4 questions

2009Interactionism in the philosophical context (20 marks)
2006Discuss Descarte’s Dualism (60 marks)
2005Mind and Body as two interacting substances (20 marks)
1998Interactionism. (20 marks)

Rationalists · Comparative

4 questions · 3 since 2013 · last asked 2024

Asked since 2013 · 3

2024Among the rationalists, whose account of mind-body problem is compatible with the notion of human freedom and free will? Critically discuss. (15 marks)
2018What is the reason for the difference in the definitions and classifications of substances made by Descartes, Spinoza and Leibniz in spite of the fact that they all belonged to the rationalist school of thought? Discuss. (20 marks)
2016Discuss the various stances on God taken by Rationalists and Empiricists. (15 marks)

Show 1 earlier question (before 2013)

1997 · 1 question

1997State, explain and discuss the various theories in traditional European philosophy regarding the relationship of body and mind (60 marks)

Descartes · Knowledge

3 questions · 3 since 2013 · last asked 2023

Asked since 2013 · 3

2023Discuss Descartes’ theory of innate ideas and the grounds on which Locke refutes it. (15 marks)
2019How does Descartes prove the existence of things other than himself and God? Discuss. (10 marks)
2017What, according to Descartes, is a ‘clear and distinct idea’? What is the epistemological status of clear and distinct ideas? Does this account help Descartes prove that material objects exist? Explain. (15 marks)

Leibniz · Indiscernibles

2 questions · 2 since 2013 · last asked 2015

Asked since 2013 · 2

2015Explain Leibnitz’s principle of ‘identity of indiscernibles’. (15 marks)
2013Give a critical account of Leibnitz’s’ principle of the identity of indiscernibles. (12.5 marks)

Descartes · God

2 questions · 0 since 2013 · last asked 2011

1997–2011 · 2 questions

2011Why does Descartes not doubt the existence of God? Explain (15 marks)
1997The idea of an all-perfect, omnipotent being implies also that it or He exists (20 marks)

Spinoza · Mind-Body

1 question · 1 since 2013 · last asked 2026

Asked since 2013 · 1

2026How does Spinoza explain the relationship between states of mind and bodily processes? (10 marks)

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