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The National Defence Academy entrance exam is conducted by the UPSC, twice a year. Comprehensive topic-wise preparation is available, separately under Mathematics, Science, English, GK, apart from Mock and Sectional tests.


This thread is dedicated to preparation for Science section of NDA. You may share questions from subjects like Physical Chemistry, Organic Chemistry, Inorganic Chemistry, Physics of Semiconductors, Nuclear Physics, Atomic Physics, Wave Optics, Ray Optics, Electromagnetic Induction, Electrodynamics, Electrostatics, Thermodynamics, Heat, Sound, Waves, Mechanics etc.

Posted 21 days ago

Solution of sodium metal in liquid ammonia is strongly reducing due to the presence of

This thread is dedicated to preparation for Mathematics section of NDA. You may share questions related to topics like Integral Calculus, Complex Numbers, Matrices and Determinants, Vectors, 3-D Geometry, Sequence/Series, Trigonometry, Co-Ordinate Geometry, Exponential and Logarithmic Series, Modern Algebra, Statistics, Differential Calculus, Functions and Equations, Permutation and Combination, Probability etc.

Lop Lobo
Posted 2 months ago

Let a, b, c be distinct numbers in G.P. such that a2 + b2 + c2 = s2 and a + b + c = s. The sum of common ratio and its reciprocal is t. The value of t in terms of  is

This thread is dedicated to preparation for Objective English section of NDA. You may post questions related to topics like Error identification, Reading Comprehension, Syllogisms, Logical Reasoning, Sentence Completion, Verbal Analogy, Odd Word Out, Paragraph Completion, Jumbled Sentence, Sentence Completion, Antonyms, Synonyms etc.

Navin Kumar Acharya
Posted 3 months ago

Find error in underlined parts (a), (b) or (c) and mark the answer accordingly. If you feel that there is no error in a sentence, then mark (d) which signifies no error.

(a) If it were not (b) for you, (c) I would not be alive today. (d) No error

This thread is dedicated to preparation for GK section of NDA.

Posted 3 months ago

How many hill stations are there in India

This thread is dedicated to discuss general NDA queries

Wasim Raza Tadamari Sheik
Posted 4 months ago

How many women were elected to the 16th Lok Sabha consisting of 543 members?

Manish Jaiswal
Posted 3 years ago

If the sum of two numbers be multiplied by each number separately, the products so obtained are 247 and 114. The sum of the numbers is