RRB NTPC flashcards
296 cards from 39 fact-checked topic notes · English
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Number System — Mathematics · 8 cards
- Natural Numbers (N)
- Counting numbers starting from 1: {1, 2, 3, 4, ...}. Used when counting discrete objects. Zero is not a natural number.
- Whole Numbers (W)
- Natural numbers plus zero: {0, 1, 2, 3, ...}. Represents quantities that can be zero (e.g., items in an empty basket).
- Integers (Z)
- All positive and negative whole numbers including zero: {..., -3, -2, -1, 0, 1, 2, 3, ...}. No fractions or decimals.
- Rational Numbers (Q)
- Any number expressible as p/q where p and q are integers and q ≠ 0. Includes terminating decimals (0.5 = 1/2) and repeating decimals (0.333... = 1/3). Every integer is rational (5 = 5/1).
- Divisibility
- A number a is divisible by b if a ÷ b leaves no remainder. Divisibility tests help you check this mentally without performing full division.
- Factors
- Numbers that divide a given number exactly. For 12: factors are 1, 2, 3, 4, 6, 12. Every number greater than 1 has at least two factors: 1 and itself.
- Multiples
- Results of multiplying a number by integers. Multiples of 5: 5, 10, 15, 20, ... A number has infinitely many multiples.
- Prime vs Composite
- A prime has exactly two factors (1 and itself); examples: 2, 3, 5, 7, 11. A composite has more than two factors; examples: 4, 6, 8, 9. Note: 1 is neither prime nor composite; 2 is the only even prime.
Decimals and Fractions — Mathematics · 8 cards
- Fraction representation
- A fraction a/b represents division of a by b. The numerator (a) is the part; denominator (b) is the whole. Proper fraction: a < b. Improper fraction: a ≥ b. Mixed number: whole number + proper fraction (e.g., 2 3/4).
- Decimal representation
- A decimal is another way to write fractions with denominators 10, 100, 1000, etc. The decimal point separates the whole part (left) from the fractional part (right). Each place to the right is one-tenth of the previous: tenths (0.1), hundredths (0.01), thousandths (0.001).
- Conversion fraction → decimal
- Divide numerator by denominator. Example: 3/4 = 3 ÷ 4 = 0.75. Terminating decimals end (like 0.5, 0.125); non-terminating decimals repeat forever (like 1/3 = 0.333...).
- Conversion decimal → fraction
- Write the decimal as a fraction with denominator 10, 100, 1000 (depending on decimal places), then simplify. Example: 0.6 = 6/10 = 3/5. For repeating decimals, use the algebraic method.
- Like and unlike fractions
- Fractions with the same denominator are like fractions (can add/subtract directly). Unlike fractions need a common denominator first (usually the LCM of denominators).
- Simplification
- Always reduce fractions to lowest terms by dividing numerator and denominator by their HCF. For decimals, remove trailing zeros after the decimal point (e.g., 2.500 = 2.5).
- Order of operations
- BODMAS applies to both fractions and decimals. Simplify brackets first, then division/multiplication (left to right), then addition/subtraction (left to right).
- Comparing values
- To compare fractions, cross-multiply or convert to decimals. To compare decimals, align decimal points and compare digit-by-digit from left.
LCM and HCF — Mathematics · 8 cards
- HCF (Highest Common Factor)
- is the largest number that divides all given numbers exactly. Think of it as the greatest measure that fits into each quantity without remainder.
- LCM (Least Common Multiple)
- is the smallest number that is a multiple of all given numbers. It represents the first point where all cycles align or the smallest quantity divisible by each number.
- Prime factorization method
- Express each number as a product of primes. HCF = product of common prime factors with lowest powers; LCM = product of all prime factors with highest powers.
- Division method (for HCF)
- Repeatedly divide the larger number by the smaller and replace the larger with the remainder until remainder is zero. The last divisor is the HCF. Also called Euclidean algorithm.
- Relationship formula
- For any two numbers a and b, LCM(a, b) × HCF(a, b) = a × b. This shortcut is gold for RRB NTPC MCQs when three of the four values are known.
- LCM/HCF of fractions
- HCF of fractions = HCF of numerators / LCM of denominators; LCM of fractions = LCM of numerators / HCF of denominators. Apply the standard methods to tops and bottoms separately.
- LCM/HCF of decimals
- Convert decimals to like decimals (same number of decimal places), remove the decimal to treat as whole numbers, find LCM/HCF, then reinsert the decimal at the same place.
- Co-prime numbers
- Two numbers with HCF = 1 (no common factor except 1). For co-primes, LCM = product of the numbers.
Ratio and Proportion — Mathematics · 7 cards
- Ratio
- expresses how many times one quantity contains another. If A:B = 3:5, then A = 3x and B = 5x for some common multiplier x. The ratio does not tell absolute values, only relative proportions.
- Proportion
- is an equation of two ratios: a:b = c:d means a/b = c/d, which gives ad = bc (cross-multiplication property). Use this to find any one unknown when three terms are known.
- Compound ratio
- of two ratios a:b and c:d is ac:bd. For three ratios a:b, c:d, e:f, compound ratio is ace:bdf. This appears when combining multiple conditions (e.g., age ratios at different times).
- Duplicate ratio
- of a:b is a²:b². Triplicate ratio is a³:b³. Sub-duplicate ratio is √a:√b. These may feature in geometry mensuration problems.
- Mean proportional
- between a and c is b where a:b = b:c, giving b² = ac, so b = √(ac). Third proportional to a and b is c where a:b = b:c. Fourth proportional to a, b, c is d where a:b = c:d.
- Partnership
- problems split profit/loss in the ratio of (capital × time). If A invests ₹3000 for 4 months and B invests ₹5000 for 6 months, profit ratio = (3000×4):(5000×6) = 12000:30000 = 2:5.
- Direct proportion
- when A increases, B increases proportionally (workers and output). Inverse proportion: when A increases, B decreases (speed and time for fixed distance). Identify the type before setting up the equation.
Percentage — Mathematics · 7 cards
- Definition
- Percentage means "out of 100." x% = x/100. It is a ratio or fraction with denominator 100.
- Conversion
- Fraction to percentage: multiply by 100. Decimal to percentage: shift decimal point two places right. Percentage to fraction: divide by 100 and simplify.
- Percentage of a quantity
- x% of N = (x/100) × N. To find "what percent A is of B," calculate (A/B) × 100.
- Percentage change formula
- Percentage change = [(New Value − Old Value) / Old Value] × 100. Positive result = increase, negative = decrease.
- Successive changes
- Two successive changes of a% and b% do not simply add. Net effect = a + b + (ab/100). Sign matters: increase is +, decrease is −.
- Reverse percentage problems
- If x% of a number gives result R, the number is R/(x/100) = (R × 100)/x.
- Comparison and ratios
- If A is x% more than B, then B is [x/(100+x)] × 100% less than A. Memorize this relationship to save time.
Mensuration — Mathematics · 3 cards
- Area
- measures the space inside a 2-D boundary; units are always square (cm², m², etc.). Perimeter measures the boundary length itself.
- Surface area
- for 3-D solids comes in two flavors: lateral (curved) surface area excludes the top/bottom bases; total surface area includes all faces.
- Volume
- measures the space a 3-D object occupies; units are cubic (cm³, m³). One cubic metre = 1000 litres; one litre = 1000 cm³.
Time and Work — Mathematics · 8 cards
- Work is always taken as 1 unit (or 100%).
- If A completes a job in 10 days, A's one-day work = 1/10. If B does it in 15 days, B's one-day work = 1/15. Work done is cumulative and additive.
- Rate of work = 1/Time.
- If time decreases, rate increases proportionally. A faster worker has a higher rate. This inverse relationship is the backbone of all problems.
- Combined work: add rates, not times.
- If A works at 1/10 per day and B at 1/15 per day, together they work at (1/10 + 1/15) per day. Never add 10 + 15 to find combined time.
- Work efficiency is the ratio of work rates.
- If A is twice as efficient as B, A's rate is double B's rate. Efficiency ratios directly convert to rate ratios.
- Man-days or worker-days measure total work.
- If 8 men complete work in 12 days, total work = 8 × 12 = 96 man-days. This quantity stays constant; if men increase, days decrease proportionally (and vice versa).
- Pipes and cisterns: inlets add, outlets subtract.
- An inlet pipe filling a tank in 6 hours has rate +1/6 per hour. An outlet (drain) emptying in 8 hours has rate –1/8 per hour. Net rate = sum of all rates with proper signs.
- LCM method simplifies fractions.
- When A finishes in 12 days and B in 18 days, assume total work = LCM(12,18) = 36 units. Then A does 3 units/day, B does 2 units/day. Integer arithmetic replaces messy fractions.
- Alternate-day work or work with breaks requires day-by-day tracking.
- If A and B work on alternate days, calculate work done in a 2-day cycle, find how many full cycles fit, then add remaining work.
Time, Distance and Speed — Mathematics · 8 cards
- Fundamental relationship
- Distance = Speed × Time. Any problem ultimately reduces to this equation or a variant. Speed = Distance/Time, Time = Distance/Speed.
- Unit conversions are non-negotiable
- km/h to m/s multiply by 5/18; m/s to km/h multiply by 18/5. Many train problems give platform/train length in metres and speed in km/h.
- Relative speed — same direction
- When two objects move in the same direction, relative speed = |Speed₁ - Speed₂|. Used when one train overtakes another or a man walks inside a moving train.
- Relative speed — opposite direction
- When two objects move toward each other, relative speed = Speed₁ + Speed₂. Critical for head-on train collisions or crossing problems.
- Average speed ≠ arithmetic mean of speeds
- For a journey with multiple legs at different speeds, Average Speed = Total Distance / Total Time. Never just average the speeds unless times are equal.
- Boats and streams logic
- Downstream speed = Boat speed in still water + Stream speed. Upstream speed = Boat speed in still water - Stream speed. Boat speed = (Downstream + Upstream)/2; Stream speed = (Downstream - Upstream)/2.
- Train crossing problems have two scenarios
- (a) Train crosses a stationary object (pole/man) — distance = train length; (b) Train crosses a platform/bridge — distance = train length + platform length.
- Time taken to cross when speeds are in opposite directions
- If two trains of lengths L₁ and L₂ move at speeds S₁ and S₂ toward each other, Time = (L₁ + L₂)/(S₁ + S₂).
Profit and Loss — Mathematics · 8 cards
- Cost Price (CP)
- The amount paid to acquire or produce a good. This is your baseline for profit or loss calculations.
- Selling Price (SP)
- The amount received when the good is sold. If SP > CP, there's a profit; if SP < CP, there's a loss.
- Profit
- Profit = SP − CP. Always expressed as a positive number. Profit% = (Profit / CP) × 100.
- Loss
- Loss = CP − SP. Loss% = (Loss / CP) × 100. Note the percentage is always calculated on CP, not SP, unless stated otherwise.
- Marked Price (MP)
- The price tag on an item before any discount. Shopkeepers mark goods above CP to absorb discount and still earn profit.
- Discount
- Reduction offered on the Marked Price. Discount = MP − SP. Discount% = (Discount / MP) × 100. The discount percentage is always on MP.
- Successive Discounts
- Two or more discounts applied one after another. You cannot simply add the percentages; use the formula: Net% = d₁ + d₂ − (d₁ × d₂)/100 for two discounts d₁% and d₂%.
- Break-even
- When SP = CP, there is neither profit nor loss. Break-even problems often involve finding the number of items to sell or the price to charge.
Geometry and Trigonometry — Mathematics · 8 cards
- Angle relationships
- Vertically opposite angles are equal; linear pair sums to 180°; angles around a point sum to 360°. Parallel lines cut by a transversal create equal corresponding angles, equal alternate interior angles, and co-interior angles summing to 180°.
- Triangle properties
- Sum of interior angles is 180°; exterior angle equals sum of two opposite interior angles. In isosceles triangles, angles opposite equal sides are equal. The area of a triangle equals ½ × base × height.
- Congruence and similarity
- Triangles are congruent if SSS (all sides equal), SAS (two sides and included angle), ASA (two angles and included side), or RHS (right angle, hypotenuse, and one side). Similar triangles have proportional sides and equal corresponding angles.
- Circle theorems
- Angle in a semicircle is 90°; angles subtended by the same arc at the circumference are equal; angle at the centre is twice the angle at the circumference; opposite angles in a cyclic quadrilateral sum to 180°.
- Trigonometric ratios
- In a right triangle with angle θ, sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse, tan θ = opposite/adjacent. The reciprocal ratios are cosec θ = 1/sin θ, sec θ = 1/cos θ, cot θ = 1/tan θ.
- Pythagorean identity
- sin²θ + cos²θ = 1 for all angles θ. This generates related identities: 1 + tan²θ = sec²θ and 1 + cot²θ = cosec²θ.
- Complementary angle relations
- sin(90° − θ) = cos θ, cos(90° − θ) = sin θ, tan(90° − θ) = cot θ.
- Heights and distances
- When observing an object, the angle of elevation is measured upward from horizontal; angle of depression is measured downward from horizontal. These angles are used with trigonometric ratios to find unknown heights or distances.
Analogies — General Intelligence and Reasoning · 7 cards
- Relationship identification
- The first pair establishes a rule (synonyms, antonyms, part-to-whole, cause-effect, mathematical operation, alphabet position). Your task is to identify this rule precisely before attempting to solve.
- Domain consistency
- Word analogies stay within semantic relationships; number analogies involve arithmetic/algebraic operations; letter analogies use alphabet positions (A=1, B=2...Z=26). Never mix domains when solving.
- Bidirectional checking
- Always verify your answer by checking if the relationship works in reverse. If A:B :: C:D, then the A→B transformation must exactly match the C→D transformation.
- Common word relationships
- Synonyms (happy:joyful), antonyms (hot:cold), part-to-whole (wheel:car), worker-to-tool (painter:brush), animal-to-young (cow:calf), category-to-example (furniture:chair), intensity levels (drizzle:downpour).
- Number patterns
- Operations (+, −, ×, ÷), squares and cubes, prime relationships, digit sums, place value manipulations, ratio patterns. Most number analogies involve one or two-step operations.
- Letter mechanics
- Positional values, forward/backward shifts, vowel-consonant patterns, positional arithmetic (A+B=C means 1+2=3), opposite letters (A↔Z, B↔Y), and alphabetical sequences.
- Elimination strategy
- When stuck between two options, create counter-examples. Test each option against the original relationship; the one that breaks the pattern is incorrect.
Completion of Number and Alphabetical Series — General Intelligence and Reasoning · 8 cards
- Number series
- typically use arithmetic operations (addition, subtraction, multiplication, division), perfect squares, cubes, primes, or factorial-based patterns. Some use differences of differences (second-order patterns).
- Alphabetical series
- rely on the position of letters in the alphabet (A=1, B=2, …, Z=26). Patterns include fixed jumps, increasing jumps, reverse order, or vowel-consonant alternation.
- Alphanumeric series
- mix numbers and letters. Solve the number part and letter part separately, then combine. Often one part is straightforward while the other has the trick.
- Alternating series
- have two interleaved sub-series. Separate odd-position and even-position terms and solve each independently.
- Difference method
- is your most powerful tool. Write the differences between consecutive terms. If differences themselves form a pattern, you've found your rule.
- Check for special sequences
- early: primes (2,3,5,7,11…), squares (1,4,9,16,25…), cubes (1,8,27,64…), Fibonacci (1,1,2,3,5,8…), factorials (1,2,6,24,120…).
- Letter position mapping
- is essential. Memorize: E=5, J=10, O=15, T=20. This speeds up calculation. Also remember reverse positions: A=26 (reverse), Z=1 (reverse).
- Mixed operations
- appear in tougher questions: one term may multiply, the next may add. Look for two-step or alternating operation patterns.
Coding and Decoding — General Intelligence and Reasoning · 8 cards
- Letter Position Values
- Every letter has a position in the English alphabet: A=1, B=2, C=3...Z=26. Many coding schemes rely on these position values, either directly or after arithmetic operations.
- Forward and Reverse Alphabets
- In reverse alphabet coding, A↔Z, B↔Y, C↔X and so on. Position of a letter + position of its reverse counterpart always equals 27. This is a common transformation rule.
- Fixed Shift (Caesar Cipher)
- Each letter is replaced by a letter a fixed number of positions ahead or behind in the alphabet. For example, shift +3 means A→D, B→E, C→F.
- Conditional Rules
- The coding rule changes based on a condition — e.g., "if the word starts with a vowel, reverse the entire code; if consonant, shift each letter by +2." Identifying the condition is the key challenge.
- Number-Letter Correspondence
- Words may be coded as sequences of numbers corresponding to letter positions, or through arithmetic (sum, product, difference of positions).
- Substitution with Symbols or Words
- Each letter, digit, or word is replaced by a specific symbol, different word, or number. Build a substitution table from the given examples to decode new words.
- Pattern Consistency
- The same rule must apply to every example given in the question. Use this to eliminate wrong answer choices — if a rule doesn't fit all examples, discard it.
- Mixed Operations
- Some questions combine two operations, such as reverse alphabet + shift, or position sum followed by digit reversal. Look for two-step logic if single rules don't fit.
Mathematical Operations — General Intelligence and Reasoning · 7 cards
- BODMAS hierarchy
- Brackets > Orders (powers/roots) > Division = Multiplication (left to right) > Addition = Subtraction (left to right). This order never changes even when symbols are substituted.
- Sign substitution
- The question defines a new meaning for standard operators. Example: "If + means ×, then solve 5 + 3". You must translate 5 + 3 into 5 × 3 = 15 using the given mapping.
- Conditional operations
- Sometimes a custom symbol (like ⊗ or #) is defined with a formula. Example: "a ⊗ b means 2a + 3b". You substitute values into the formula to compute.
- Missing operator problems
- Given an equation with blanks where operators should be, find which combination of +, −, ×, ÷ makes the equation true. Test systematically using BODMAS.
- Equation balancing
- Some questions ask "which two signs should be interchanged to make this equation correct?" You try swaps and verify using BODMAS.
- Read carefully
- The most common trap is misreading the substitution. If the question says "+ means −", then every + in the expression becomes − in your working.
- Work in two steps
- First translate the expression using the new rules. Second, calculate using standard BODMAS. Keep these steps separate to avoid confusion.
Similarities and Differences — General Intelligence and Reasoning · 7 cards
- Odd One Out principle
- In a set of 4-5 items, exactly one does not share the defining property of the others. Your job is to identify the common property first, then find the exception.
- Classification by number properties
- Numbers can be grouped by divisibility (multiples of 3, 5), type (prime, composite, perfect square, perfect cube), digit sum, or mathematical operations (sum of digits, product of digits).
- Letter-based patterns
- Letters may be classified by position in alphabet (vowels vs consonants, first half vs second half), alphabetical order, positional values (A=1, B=2...), or letter clusters.
- Word classification
- Words are grouped semantically (fruits, animals, metals, rivers) or by linguistic properties (starting letter, number of syllables, gender in nouns, verb vs noun).
- Mixed item classification
- Questions may mix numbers with letters, or use real-world items (months, capitals, scientists, historical events) requiring general knowledge to identify categories.
- Multiple valid groupings
- Sometimes 3 items share one property and a different set of 3 shares another. Always pick the grouping where the odd one is most clearly different — the examiner's intended answer usually has the strongest contrast.
- Elimination strategy
- When stuck, test each option as the "odd one" and see if the remaining items share an obvious property. The option that leaves the cleanest group behind is your answer.
Relationships — General Intelligence and Reasoning · 8 cards
- Direct relations
- Father, mother, son, daughter, brother, sister, husband, wife. These form the foundation of all other relationships.
- One-generation extended relations
- Uncle (father's or mother's brother), aunt (father's or mother's sister), nephew (brother's or sister's son), niece (brother's or sister's daughter). Always distinguish paternal (father's side) from maternal (mother's side).
- Two-generation relations
- Grandfather, grandmother, grandson, granddaughter, great-grandfather, great-grandson. Count the generation jumps carefully.
- In-law relations
- Created by marriage. Brother-in-law (spouse's brother OR sister's husband), sister-in-law (spouse's sister OR brother's wife), father-in-law, mother-in-law, son-in-law, daughter-in-law.
- Cousin relations
- Children of your uncle or aunt are your cousins. The exam may test whether you recognize "my father's brother's son" as "my cousin."
- Gender sensitivity
- "Only son" means no brothers. "Only child" means no siblings at all. "Only daughter" means no sisters but may have brothers. Read carefully.
- Chain principle
- If A is B's father and B is C's mother, then A is C's maternal grandfather. Break complex statements into step-by-step links.
- Symmetry check
- If X is Y's brother, then Y is X's brother or sister (depending on Y's gender). Use this to verify your answer.
Analytical Reasoning — General Intelligence and Reasoning · 8 cards
- Linear Seating Arrangements
- People sit in a row facing North/South. Track left-right relations, positions from ends, and direction of facing. Questions ask "Who sits third from left?" or "How many sit between X and Y?"
- Circular Seating Arrangements
- People sit around a round/square table, facing center or outward. Relations are clockwise/anticlockwise, immediate neighbors, and opposite positions. Always note facing direction—it changes who is "to the left."
- Ranking and Ordering
- Items or people arranged by height, weight, marks, age, or performance. Typically: "A is taller than B but shorter than C" chains. Deduce the full sequence, then answer positional queries like "Who ranks 4th?"
- Floor-Based Puzzles
- People live on different floors of a building (ground = 1st floor or 0, depending on problem statement). Track who lives above/below whom, gaps between floors, and floor-specific conditions.
- Day/Month Scheduling
- Events occur on different days of the week or months of the year. Mind the cyclic nature—Sunday wraps to Monday, December to January. Conditions like "two days gap" or "immediately before" need careful counting.
- Multi-Variable Puzzles
- Combine multiple attributes—person, color, fruit, city—and match them using clues. Use a grid (rows = persons, columns = attributes) to eliminate impossibilities systematically.
- Constraint-Based Logic
- Every puzzle gives positive and negative constraints. Mark definite placements first, then use "if-then" reasoning for uncertain cases. When stuck, test extreme positions (corners, ends) to force contradictions.
- Question Types After Solving
- Once the arrangement is fixed, questions ask direct facts (who sits where?), neighborhood queries (who is X's neighbor?), counting problems (how many between?), or "cannot be determined" traps when data is insufficient.
Syllogism — General Intelligence and Reasoning · 7 cards
- Universal Affirmative (All A are B)
- Every member of set A is contained within set B. Venn diagram shows circle A completely inside circle B.
- Universal Negative (No A are B)
- Sets A and B have no common members. Venn diagram shows two separate, non-overlapping circles.
- Particular Affirmative (Some A are B)
- At least one member of A is also a member of B. Venn diagram shows overlapping circles with intersection marked; "some" means "at least one," not "only a few."
- Particular Negative (Some A are not B)
- At least one member of A is outside B. Part of circle A extends beyond circle B.
- Complementary pairs
- "All A are B" and "Some A are not B" cannot both be true. "No A are B" and "Some A are B" cannot both be true. These help in either-or conclusion questions.
- Valid conclusion rule
- A conclusion is valid only if it is true in every possible Venn diagram representation of the premises. If you can draw even one diagram where the premises hold but the conclusion fails, the conclusion is invalid.
- "Some" is bidirectional
- "Some A are B" automatically means "Some B are A." Both statements are logically equivalent and interchangeable.
Jumbling — General Intelligence and Reasoning · 8 cards
- Mandatory pairs
- Certain sentences/words naturally follow one another due to pronouns (he/she referring to a previously named person), demonstratives (this/that/these referring to prior concepts), or cause-effect relationships (because, therefore, hence).
- Opening sentence identification
- Look for independent statements introducing a topic without referring to unstated information. Avoid sentences starting with pronouns, connectors like "however" or "moreover," or demonstratives without antecedents.
- Closing sentence recognition
- Final sentences often contain concluding markers (thus, finally, in conclusion) or provide summary statements that wrap up the discussion without leaving threads open.
- Chronological and logical flow
- Events should follow temporal order (past → present → future) or logical progression (problem → analysis → solution, or general statement → specific example).
- Subject consistency
- Track the main subject through sentences. Pronouns must have clear antecedents in preceding sentences. Sudden subject changes signal incorrect ordering.
- Connector words as signposts
- Words like "but," "however," "moreover," "furthermore," "on the other hand" indicate relationships with previous sentences and cannot appear first in a sequence.
- Word rearrangement fundamentals
- In jumbled word questions, identify the subject first, then verb, then object/complement. Articles (a, an, the) help identify noun phrases. Prepositions signal relationships between words.
- Elimination strategy
- For both types, eliminate obviously wrong sequences first. Test remaining options by reading them aloud mentally—the correct sequence will "sound right" grammatically and contextually.
Venn Diagrams — General Intelligence and Reasoning · 8 cards
- Set
- A collection of distinct objects or elements. Denoted by capital letters like A, B, C.
- Universal Set (U)
- The superset containing all elements under consideration. In diagrams, represented by a rectangle enclosing all circles.
- Intersection (A ∩ B)
- Elements common to both sets A and B. Shown by the overlapping region of two circles. "Students who play both cricket AND football."
- Union (A ∪ B)
- All elements in A or B or both. The combined area covered by both circles. "Students who play cricket OR football or both."
- Complement (A')
- Elements in the universal set but NOT in A. The region outside circle A but inside the rectangle.
- Disjoint Sets
- Sets with no common elements. Their circles do not overlap; A ∩ B = ∅.
- Three-Set Diagrams
- For sets A, B, C, the diagram has 8 regions: only A, only B, only C, A∩B only, B∩C only, A∩C only, A∩B∩C (all three), and none. Always start filling from the center (A∩B∩C) and work outward.
- Cardinality
- The number of elements in a set, written as |A| or n(A). Calculating n(A ∪ B) = n(A) + n(B) − n(A ∩ B) is the most common formula.
Puzzle — General Intelligence and Reasoning · 6 cards
- Constraint-based solving
- Each statement eliminates possibilities. Mark definite placements first, then use remaining constraints to narrow options until only one arrangement fits all conditions.
- Visual representation
- Always draw. For linear seating, draw a horizontal line with positions. For circular seating, draw a circle. For scheduling, create a day/month table. For ranking, use a vertical ladder or number line.
- Reference point technique
- Identify one person/item mentioned in multiple constraints as your anchor. Fix their position first (or try both possibilities if two options exist), then place others relative to them.
- Elimination over construction
- When options are given, test each option against constraints rather than constructing the full solution from scratch.
- Negative constraints matter
- "A is not next to B" or "C is not on Wednesday" are as valuable as positive constraints. Track what cannot happen alongside what must happen.
- Double-check definite answers
- Questions often ask "Who sits second from left?" or "Which day is the meeting?" Verify your answer matches exactly what's asked — students lose marks answering a different question than what was posed.
Statement and Conclusion — General Intelligence and Reasoning · 8 cards
- Statement
- A declarative sentence assumed to be true for the purpose of the question. You must accept it as given, even if it contradicts reality.
- Conclusion
- A proposition that may or may not follow logically from the statement(s). A conclusion "follows" if it must be true whenever the statements are true.
- Logical Following vs. Possibly True
- A conclusion follows only if the statements guarantee it. If a conclusion could be true or could be false based on the statements, it does not follow.
- Definite vs. Probable
- Conclusions using words like "all," "no," "definitely" make strong claims. Conclusions with "some," "may," "possibly" make weaker claims. Weaker claims are easier to satisfy but still must be logically supported.
- Complementary Pairs
- If one conclusion says "All X are Y" and another says "Some X are not Y," both cannot follow simultaneously. Watch for mutually exclusive conclusion pairs.
- Implicit Information
- Sometimes a statement implies additional facts through logical necessity (e.g., "All cats are animals" implies "Some animals are cats"), but you cannot add information not implied by the statements.
- Common Question Formats
- (a) Only conclusion I follows. (b) Only conclusion II follows. (c) Either I or II follows. (d) Neither I nor II follows. (e) Both I and II follow.
- "Either-Or" Case
- When two conclusions are complementary (one must be true if the statements are true, but you can't tell which), the answer is "Either I or II follows."
Decision Making — General Intelligence and Reasoning · 8 cards
- Eligibility criteria structure
- Typically 4–6 conditions covering age limits, educational qualifications, work experience, marks/percentages, physical standards, and sometimes domicile or language requirements.
- Main decision categories
- (a) Candidate satisfies all conditions → Eligible/Selected; (b) Candidate satisfies all except one specific condition for which an exception/referral clause exists → Refer to Authority X; (c) Candidate fails one or more conditions with no exception → Not Eligible/Reject.
- Exception clauses
- Watch for phrases like "However, if the candidate...", "In case a candidate...", "Provided that...". These create referral paths when a candidate narrowly misses one criterion but compensates with another strength.
- Date calculations
- Age and experience are often stated as "as on 01-01-2023" or "as on the closing date". Calculate precisely — being 27 years 364 days old is NOT the same as being 28 years old.
- AND logic dominance
- Unless explicitly stated otherwise, ALL conditions must be satisfied. A candidate who meets 5 out of 6 conditions is NOT eligible unless the failed condition has an exception clause.
- Information sufficiency
- If the candidate's profile lacks information needed to verify a condition (e.g., marks not given when minimum 60% is required), assume data is insufficient → cannot be selected.
- Boundary conditions
- Pay special attention to inclusive vs exclusive limits. "Between 21 and 28 years" usually means 21 ≤ age ≤ 28, but verify from context. "Above 60%" typically means > 60, not ≥ 60.
- Multiple exception clauses
- Some questions have 2–3 referral categories (refer to GM, refer to VP, refer to Board). Match the candidate's shortfall to the correct exception clause — don't mix them up.
Maps and Graphs — General Intelligence and Reasoning · 8 cards
- Cardinal directions
- The four main directions are North (N), South (S), East (E), and West (W). Pairs are opposite: N-S and E-W. When facing North, right is East and left is West.
- Inter-cardinal directions
- The diagonal directions are North-East (NE), South-East (SE), South-West (SW), and North-West (NW). Each lies exactly between two cardinal directions at 45° angles.
- Distance calculation
- For movements along cardinal directions (N, S, E, W), use simple addition/subtraction. For diagonal paths or mixed movements, apply Pythagoras theorem: distance² = horizontal² + vertical².
- Shadow problems
- Morning shadows fall westward; evening shadows fall eastward. The shadow always points opposite to the sun's position. If a person faces their shadow in morning, they face west.
- Bar graphs
- show discrete categories as vertical or horizontal bars. Height/length represents quantity. Use them to compare values across categories or time periods.
- Line graphs
- display trends over continuous time periods. The slope indicates rate of change—steep slope means rapid change, flat means stable. Read intersections carefully when multiple lines are present.
- Pie charts
- represent parts of a whole as sectors. The entire circle is 100% or 360°. To find a value: (sector angle ÷ 360) × total, or (sector percentage ÷ 100) × total.
- Data interpretation operations
- Most questions ask for percentage increase/decrease, ratio between quantities, average of multiple values, difference between categories, or ranking items from highest to lowest.
Current Events of National and International Importance — General Awareness · 7 cards
- 12-Month Window
- Focus on events from approximately one year before the exam. If your exam is in March 2025, focus on April 2024–March 2025 developments. Avoid outdated information from earlier years.
- National Emphasis
- Indian appointments (governors, CMs, judges), central government schemes, defence acquisitions, space missions, economic indicators (GDP, inflation, repo rate), and state-specific developments are key areas.
- Awards and Honours
- Know the Padma Awards (announced Republic Day), Bharat Ratna, Nobel Prizes (October), and international honours received by Indians. Know the field/contribution for which the award was given.
- International Relations
- Bilateral summits between India and major powers (US, Russia, Japan, France), India's participation in multilateral forums (G20, BRICS, SCO, ASEAN), and defence/trade agreements are important.
- Appointments
- Chief Justice of India, Cabinet Ministers after reshuffle, Heads of Defence Forces, RBI Governor, Election Commissioners, State Governors—memorize names with their exact positions and appointment dates.
- Economic Events
- Union Budget highlights, RBI monetary policy decisions (repo rate changes), India's GDP growth figures, inflation rates, and major economic reforms (GST changes, subsidy schemes) are testable.
- Science and Technology
- ISRO missions (satellite launches, manned missions), DRDO defence technology, India's supercomputers, and major scientific breakthroughs by Indian institutions are also relevant.
Games and Sports — General Awareness · 8 cards
- Olympic Games
- Held every four years (Summer and Winter separately); governed by IOC. India's best Olympic performance came in Tokyo 2020 (held in 2021) with 7 medals. Paris 2024 Olympics is the next Summer Games; memorize India's medal winners and their events.
- Commonwealth Games
- Held every four years among Commonwealth nations. India traditionally performs well in wrestling, weightlifting, shooting, and badminton. The 2022 edition was in Birmingham, UK.
- Asian Games
- Continental multi-sport event held every four years. China, Japan, and South Korea dominate; India ranked fourth in 2022 (eighth in 2018). The 2022 edition (held in 2023) took place in Hangzhou, China.
- Cricket Tournaments
- ICC Cricket World Cup (ODI, every four years), T20 World Cup (every two years), Champions Trophy, IPL (annual franchise league), Asia Cup (ODI/T20 alternating, usually biennial). India won T20 World Cup in 2007 and 2024, ODI World Cup in 1983 and 2011.
- Football Tournaments
- FIFA World Cup (every four years), UEFA Champions League (annual club tournament), Indian Super League (ISL), I-League. FIFA World Cup 2022 was won by Argentina; Qatar hosted. Euro 2024 held in Germany.
- Badminton
- Major tournaments include All England Championship, World Championships, Thomas Cup (men's team), Uber Cup (women's team), Sudirman Cup (mixed team). PV Sindhu and Saina Nehwal are India's top shuttlers; Lakshya Sen and HS Prannoy lead men's singles currently.
- Tennis
- Grand Slams are Australian Open, French Open, Wimbledon, US Open. Davis Cup (men's team), Billie Jean King Cup (women's team). Rohan Bopanna is India's top doubles player; he won Australian Open 2024 men's doubles.
- Hockey
- India's national sport (traditionally); men's team won Olympic bronze in Tokyo 2020. FIH Hockey World Cup, Champions Trophy, Asia Cup are major events. Indian men won Asian Champions Trophy 2023.
Biology / Life Science (Class 10) — General Awareness · 8 cards
- Life Processes
- All living organisms perform seven key life processes — nutrition, respiration, transportation, excretion, control and coordination, reproduction, and growth. These maintain life and distinguish living from non-living.
- Nutrition Types
- Autotrophic nutrition (plants make food via photosynthesis using chlorophyll, sunlight, CO₂, water) versus heterotrophic nutrition (animals consume ready-made organic food). Photosynthesis equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
- Human Digestive System
- Sequential organs — mouth (salivary amylase breaks starch), oesophagus, stomach (pepsin digests protein in acidic medium), small intestine (maximum absorption, villi increase surface area), large intestine (water absorption). Liver secretes bile (emulsifies fats); pancreas secretes digestive enzymes.
- Respiration
- Cellular process releasing energy from glucose. Aerobic respiration (with oxygen): C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (38 ATP). Anaerobic respiration (without oxygen): produces lactic acid in muscles or ethanol + CO₂ in yeast (less energy).
- Circulatory System
- Heart is a four-chambered muscular pump (two atria, two ventricles). Blood consists of plasma (55%), RBCs (carry oxygen via haemoglobin), WBCs (immunity), and platelets (clotting). Arteries carry blood away from the heart (oxygenated, except the pulmonary artery);
- Excretory System
- Kidneys filter blood to remove urea and excess water forming urine. Nephron is the functional unit. Urine stored in urinary bladder. Dialysis artificially filters blood when kidneys fail.
- Nervous System
- Brain (cerebrum, cerebellum, medulla) and spinal cord form CNS. Neurons transmit electrical impulses. Reflex actions are rapid, involuntary responses bypassing brain (e.g., touching hot object).
- Endocrine System
- Ductless glands secrete hormones directly into blood. Key glands: pituitary (growth hormone), thyroid (thyroxine regulates metabolism), pancreas (insulin regulates blood sugar), adrenal (adrenaline for emergency), testes (testosterone), ovaries (oestrogen, progesterone).
Indian Literature — General Awareness · 8 cards
- Indian literature is multilingual
- India has 22 scheduled languages and rich literary traditions in each. Examinations focus on major languages—Hindi, Bengali, Tamil, Urdu, Kannada, Malayalam, Marathi, Telugu, Odia, Gujarati, Punjabi, Assamese, and Sanskrit.
- Classical vs. modern
- Classical works include Vedas, Upanishads, Ramayana, Mahabharata, Sangam poetry (Tamil), and Kalidasa's plays (Sanskrit). Modern literature (19th century onward) includes novels, short stories, and poetry in regional languages and English.
- Jnanpith Award
- is India's highest literary honour, given annually since 1965 for outstanding contribution to Indian literature. Winners include G. Sankara Kurup (first, 1965) and Amitav Ghosh (2018).
- Sahitya Akademi Award
- is a yearly award for the best book in each of the 24 languages recognised by the Akademi. Instituted in 1954, it is more common than the Jnanpith and easier to test in exams.
- Nobel Prize in Literature
- has been won by only one Indian—Rabindranath Tagore in 1913 for "Gitanjali" (Song Offerings), a collection of poems originally in Bengali, later translated by Tagore himself into English.
- Booker Prize
- (now called the Booker Prize and Booker International) has been won by Indian English authors Arundhati Roy (1997, "The God of Small Things"), Salman Rushdie (1981, "Midnight's Children"), Kiran Desai (2006, "The Inheritance of Loss"), and Aravind Adiga (2008, "The White Tiger").
- Regional language literature
- is vibrant. Bengali Renaissance produced Tagore, Bankim Chandra, Sarat Chandra. Hindi heartland gave us Premchand, Mahadevi Varma, Harivansh Rai Bachchan. South India has Subramania Bharati (Tamil), Kuvempu (Kannada), Thakazhi (Malayalam), Viswanatha Satyanarayana (Telugu).
- Themes and genres
- Social reform, nationalism, partition trauma, rural life, women's issues, historical epics, and mythological retellings dominate Indian literature. Genres include poetry, novels, short stories, plays, essays, and devotional hymns (bhakti literature).
Monuments and Places of India — General Awareness · 8 cards
- UNESCO World Heritage Sites in India
- India currently has 40 UNESCO World Heritage Sites (32 cultural, 7 natural, 1 mixed). These include Taj Mahal, Qutub Minar, Ajanta-Ellora Caves, Kaziranga National Park, and Western Ghats. Knowing the classification (cultural/natural) and year of inscription helps in exams.
- Mughal Architecture
- Characterized by large bulbous domes, slender minarets, Persian gardens (charbagh), red sandstone and white marble. Key examples: Taj Mahal (Agra), Red Fort (Delhi), Humayun's Tomb (Delhi), Fatehpur Sikri.
- Ancient Rock-Cut Architecture
- Temples and monasteries carved directly from rock faces. Major sites include Ajanta Caves (Buddhist paintings), Ellora Caves (Hindu-Buddhist-Jain), Elephanta Caves (Shiva temple), and Mahabalipuram (Shore Temple and rathas).
- Temple Architecture Styles
- Nagara style (North India) features beehive-shaped shikhara; Dravidian style (South India) has pyramid-shaped vimana and tall gopurams (gateway towers); Vesara style blends both. Examples: Khajuraho (Nagara), Brihadeeshwara Temple (Dravidian), Hoysala temples (Vesara).
- Colonial Architecture
- British-era buildings combining European styles with Indian elements. Notable examples: Victoria Memorial (Kolkata), Gateway of India (Mumbai), Rashtrapati Bhavan (Delhi), and numerous railway stations like Chhatrapati Shivaji Terminus (Mumbai, UNESCO site).
- Buddhist Monuments
- Stupas (hemispherical structures containing relics), viharas (monasteries), and chaityas (prayer halls). Key sites: Sanchi Stupa (Madhya Pradesh), Nalanda University ruins (Bihar), Bodh Gaya (Buddha's enlightenment site).
- Forts and Palaces
- India's military and royal heritage. Major forts include Agra Fort, Golconda Fort (Hyderabad), Mehrangarh Fort (Jodhpur), and Amber Fort (Jaipur). The Hill Forts of Rajasthan are collectively a UNESCO site.
- Modern Memorials
- Sites commemorating national leaders and events. India Gate (Delhi, war memorial), Raj Ghat (Gandhi's cremation site), Jallianwala Bagh (Amritsar massacre site), and Cellular Jail (Andaman, freedom fighters' prison).
History of India and Freedom Struggle — General Awareness · 8 cards
- Periodization
- Ancient India (3300 BCE–650 CE), Medieval India (650–1757 CE), Modern India (1757–1947). The transition points are Harappan decline, start of Sultanate rule, and Battle of Plassey respectively.
- Indus Valley Civilization
- (3300–1300 BCE): Urban planning, drainage systems, trade with Mesopotamia. Major sites: Harappa, Mohenjo-Daro, Lothal, Dholavira. No deciphered script yet; possibly ended due to climate change or Aryan migration.
- Vedic Period
- (1500–500 BCE): Rigvedic (early) and Later Vedic phases. Society evolved from tribal to settled agriculture. Four Vedas composed. Varna system emerged in later phase.
- Mauryan Empire
- (322–185 BCE): Chandragupta Maurya founded it; Ashoka (268–232 BCE) most famous for Kalinga War, Buddhist conversion, and rock edicts. First pan-Indian empire with organized administration.
- Gupta Period
- (320–550 CE): "Golden Age" — Aryabhata, Kalidasa, Nalanda University. Declined due to Huna invasions. Major achievements in science, mathematics (zero, decimal system), and Sanskrit literature.
- Delhi Sultanate
- (1206–1526): Five dynasties — Slave, Khilji, Tughlaq, Sayyid, Lodi. Qutub Minar built. Alauddin Khilji repelled Mongol invasions. Muhammad bin Tughlaq shifted capital to Daulatabad (failed experiment).
- Mughal Empire
- (1526–1857): Founded by Babur (Battle of Panipat, 1526). Akbar (1556–1605) consolidated empire with religious tolerance. Aurangzeb (1658–1707) expanded territory but created religious tensions. Empire declined after Aurangzeb; Mughal emperor Shah Alam II was defeated at Buxar (1764).
- Freedom Struggle milestones
- Revolt of 1857, formation of Indian National Congress (1885), Partition of Bengal (1905), Non-Cooperation Movement (1920–22), Civil Disobedience (1930), Quit India (1942), Independence (15 August 1947).
Physical, Social and Economic Geography of India and World — General Awareness · 8 cards
- Physical Divisions of India
- India has six major physiographic divisions — the Northern Mountains (Himalayas), Northern Plains (Indo-Gangetic), Peninsular Plateau (Deccan), Coastal Plains (Eastern and Western), Islands (Andaman-Nicobar, Lakshadweep), and the Indian Desert (Thar). Each has distinct relief, drainage, and economic significance.
- Climate Zones
- India experiences a tropical monsoon climate with four main seasons — winter (December-February), summer (March-May), southwest monsoon (June-September), and northeast monsoon (October-November). The monsoon contributes 75% of annual rainfall and governs agricultural cycles.
- River Systems
- Rivers are classified as Himalayan (perennial, fed by snow and rain — Ganga, Brahmaputra, Indus) and Peninsular (seasonal, rain-fed — Godavari, Krishna, Kaveri, Narmada, Tapi). The Ganga-Brahmaputra system forms the world's largest delta in Bangladesh-West Bengal.
- Agricultural Geography
- Agriculture employs nearly 45% of India's workforce. Major crops include rice (West Bengal, Punjab, Uttar Pradesh), wheat (Punjab, Haryana, Uttar Pradesh), cotton (Gujarat, Maharashtra), sugarcane (Uttar Pradesh, Maharashtra), tea (Assam, West Bengal), coffee (Karnataka, Kerala), and pulses (Madhya Pradesh, Rajasthan).
- Economic Geography Fundamentals
- Economic geography links physical resources to economic activities. India's mineral belt lies in Chhattisgarh-Jharkhand-Odisha (iron ore, coal, bauxite). Industrial clusters include Mumbai-Pune (textiles, chemicals), Bengaluru (IT), Chennai-Coimbatore (automobiles, textiles), and Jamshedpur-Bokaro (steel).
- World Geography Essentials
- Focus on continents (largest: Asia; smallest: Australia), major mountain ranges (Andes, Rockies, Alps, Himalayas — highest), longest rivers (Nile, Amazon, Yangtze), largest deserts (Sahara), and key countries by area (Russia, Canada, USA, China, Brazil, Australia, India).
- Latitude-Longitude Significance
- The Tropic of Cancer (23.5°N) passes through 8 Indian states (Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, Mizoram). The Standard Meridian (82.5°E) passes through Mirzapur (Uttar Pradesh) and determines Indian Standard Time.
- Soil Types of India
- Major soil types are Alluvial (most fertile, Indo-Gangetic plains), Black (cotton-growing Deccan), Red (Tamil Nadu, Karnataka — less fertile), Laterite (heavy rainfall areas, Kerala, Odisha — poor fertility), Arid (Rajasthan, Gujarat), and Mountain soils (Himalayas).
Indian Polity and Governance — Constitution and Political System — General Awareness · 8 cards
- Constitution of India
- Adopted on 26 November 1949, came into force on 26 January 1950. Dr. B.R. Ambedkar is known as the Father of the Indian Constitution and chaired the Drafting Committee. The Constitution originally had 395 Articles, 22 Parts, and 8 Schedules (now 12 Schedules, 448 Articles, 25 Parts after amendments).
- Preamble
- The introduction to the Constitution declaring India a Sovereign, Socialist, Secular, Democratic Republic. The words "Socialist," "Secular," and "Integrity" were added by the 42nd Amendment (1976).
- Fundamental Rights (Part III, Articles 12–35)
- Seven categories originally; Right to Property removed by 44th Amendment. Now six remain: Right to Equality, Right to Freedom, Right against Exploitation, Right to Freedom of Religion, Cultural and Educational Rights, Right to Constitutional Remedies (Article 32).
- Fundamental Duties (Part IV-A, Article 51A)
- Introduced by the 42nd Amendment in 1976. Originally 10 duties; the 86th Amendment (2002) added the 11th duty (parents to provide education to children aged 6–14).
- Directive Principles of State Policy (Part IV, Articles 36–51)
- Non-justiciable guidelines for the state to establish social and economic democracy. Cover welfare state principles like free legal aid, uniform civil code, prohibition of cow slaughter, etc.
- Parliament
- Bicameral legislature consisting of Lok Sabha (House of the People, 550 members maximum) and Rajya Sabha (Council of States, 250 members maximum). President is part of Parliament. Lok Sabha elected directly for 5 years; Rajya Sabha is permanent, one-third retire every 2 years.
- Judiciary
- Three-tier system with Supreme Court at the apex, High Courts at state level, and subordinate courts below. Supreme Court established on 26 January 1950 with 1 Chief Justice and 7 judges initially (now 34 judges including CJI). Articles 124–147 deal with the Supreme Court.
- Panchayati Raj
- The 73rd Amendment (1992) gave constitutional status to Panchayati Raj institutions, establishing a three-tier system in rural areas: Gram Panchayat (village), Panchayat Samiti (block), Zila Parishad (district). Added Part IX and 11th Schedule listing 29 subjects under Panchayat purview.
UN and Other Important World Organisations — General Awareness · 8 cards
- United Nations (UN)
- Established 24 October 1945 with 51 founding members (now 193 member states); headquarters in New York; maintains international peace, develops friendly relations among nations, promotes human rights and social progress. India is a founding member.
- Six Principal UN Organs
- General Assembly (main deliberative body, all members), Security Council (15 members, 5 permanent with veto power—USA, UK, France, Russia, China), Economic and Social Council (54 members), Trusteeship Council (suspended operations 1994), International Court of Justice (The Hague, Netherlands), and UN Secretariat …
- Specialised UN Agencies
- Autonomous organisations linked to UN through special agreements—WHO (health), UNESCO (education/culture), ILO (labour), FAO (food/agriculture); UNICEF (children) and UNDP (development) are UN funds and programmes, not specialised agencies. Each has separate membership, budget, and headquarters.
- Bretton Woods Institutions
- IMF and World Bank Group created in 1944 Bretton Woods Conference to rebuild post-WWII economy. IMF focuses on monetary cooperation and exchange rate stability; World Bank provides long-term development loans. Both headquartered in Washington DC.
- World Trade Organization (WTO)
- Established 1 January 1995 replacing GATT (General Agreement on Tariffs and Trade); headquarters Geneva, Switzerland; 166 members; regulates international trade, resolves trade disputes, negotiates trade agreements. India is a founding member of WTO.
- World Health Organization (WHO)
- UN specialised agency for international public health; established 7 April 1948; headquarters Geneva; 194 member states; coordinates responses to health emergencies, sets health standards, fights communicable diseases. Played central role in COVID-19 pandemic response.
- Regional Organisations India Participates In
- SAARC (South Asian regional cooperation, Kathmandu), BRICS (Brazil-Russia-India-China-South Africa cooperation), G20 (major economies forum), Non-Aligned Movement (120+ developing nations), Commonwealth of Nations (56 members, mostly former British colonies).
- Functional Groupings
- Financial institutions (IMF, World Bank, ADB), trade bodies (WTO), health/humanitarian (WHO, UNICEF, Red Cross), security (UN Security Council, NATO), development (UNDP, UNEP), labour/social (ILO, UNESCO). Group organisations by their primary mandate for easier recall.
Environmental Issues Concerning India and the World — General Awareness · 8 cards
- Climate Change
- Long-term shift in global temperature and weather patterns caused primarily by greenhouse gas emissions (CO₂, CH₄, N₂O) from burning fossil fuels, deforestation, and industrial activity. Effects include rising sea levels, extreme weather events, glacier melting, and disrupted agriculture.
- Greenhouse Effect
- Natural process where gases like CO₂, methane, and water vapour trap heat in Earth's atmosphere. Human activities have intensified this effect, leading to global warming.
- Air Pollution
- Contamination of air by particulate matter (PM2.5, PM10), nitrogen oxides (NOₓ), sulphur dioxide (SO₂), carbon monoxide, and ozone. Major sources: vehicular emissions, industrial discharge, crop burning. Health impacts include respiratory diseases and cardiovascular problems.
- Water Pollution
- Contamination of rivers, lakes, groundwater by industrial effluents, sewage, agricultural runoff (pesticides, fertilisers), and plastic waste. Leads to eutrophication, loss of aquatic life, and waterborne diseases.
- Biodiversity
- Variety of life forms (species, genes, ecosystems) on Earth. India is a megadiverse country with four biodiversity hotspots. Loss of biodiversity threatens ecosystem services, food security, and medical resources.
- Deforestation
- Clearing of forests for agriculture, urbanisation, logging. Causes habitat loss, soil erosion, disrupted water cycles, and increased CO₂ levels. India loses thousands of hectares of forest cover annually despite afforestation efforts.
- Ozone Layer Depletion
- Thinning of the stratospheric ozone layer (which shields Earth from harmful UV radiation) due to chlorofluorocarbons (CFCs) and halons. Montreal Protocol successfully phased out most ozone-depleting substances.
- Sustainable Development
- Development that meets present needs without compromising future generations' ability to meet theirs. Balances economic growth, environmental protection, and social equity.
Transport Systems in India — General Awareness · 7 cards
- Indian Railways
- is the world's fourth-largest railway network by size and one of the largest employers globally. It is organized into 18 zones, each with a zonal headquarters and general manager.
- National Highways (NH)
- form the backbone of India's road network, managed by the National Highways Authority of India (NHAI). State highways and district roads complement this network.
- Major and Minor Ports
- India has 13 major ports (under central government) and over 200 minor/intermediate ports (under state governments). Major ports handle the bulk of cargo.
- Civil Aviation
- is regulated by the Directorate General of Civil Aviation (DGCA), while the Airports Authority of India (AAI) builds and manages airports. India has international and domestic airports across all regions.
- Golden Quadrilateral (GQ)
- and North-South and East-West Corridors (NS-EW) are flagship highway projects connecting the four metropolitan cities and improving connectivity.
- Dedicated Freight Corridors (DFC)
- are high-capacity rail lines exclusively for freight, improving cargo speed and reducing congestion on passenger routes.
- Metro Rail
- systems now operate in multiple Indian cities (Delhi, Mumbai, Bengaluru, Kolkata, Chennai, Hyderabad, etc.), with more under construction.
Indian Economy — General Awareness · 8 cards
- Mixed Economy
- India follows a mixed economic system combining private enterprise with public sector participation and government regulation. The balance has shifted toward liberalization since 1991 reforms.
- Reserve Bank of India (RBI)
- India's central bank, established in 1935 (nationalized 1949). Controls monetary policy, issues currency, regulates banks, manages foreign exchange reserves, and acts as banker to the government.
- Banking Structure
- Three-tier system consisting of scheduled commercial banks (public sector, private sector, foreign banks), cooperative banks, and regional rural banks. Nationalization occurred in two phases (1969 and 1980).
- Taxation System
- Comprises direct taxes (income tax, corporate tax) collected by Central Board of Direct Taxes, and indirect taxes (GST, customs, excise) under Central Board of Indirect Taxes and Customs. GST implemented from July 1, 2017.
- Union Budget
- Annual financial statement presented in Parliament (usually February 1), detailing government's revenue and expenditure for the fiscal year (April 1 to March 31). Includes tax proposals and allocation to ministries.
- Economic Indicators
- Quantitative measures of economic performance including GDP (Gross Domestic Product), inflation rate (CPI and WPI), unemployment rate, fiscal deficit, current account deficit, and foreign exchange reserves.
- Fiscal Policy vs. Monetary Policy
- Fiscal policy involves government spending and taxation decisions (managed by Finance Ministry). Monetary policy controls money supply and interest rates (managed by RBI).
- Financial Inclusion
- Government initiatives like Jan Dhan Yojana, Aadhaar-enabled payments, and priority sector lending aim to bring unbanked population into formal banking system.
Flora and Fauna of India — General Awareness · 8 cards
- National Parks
- are IUCN Category II protected areas where human activity (except tourism and research) is strictly prohibited. India has over 100 national parks; they are declared by State (or Central) Government notification under the Wild Life (Protection) Act, 1972, and their boundaries can be altered only on the recommendation …
- Wildlife Sanctuaries
- allow limited human activity like grazing and collection of forest produce, but killing or capturing wildlife is banned. India has about 550 wildlife sanctuaries.
- Biosphere Reserves
- are multi-use areas with core zones (strict protection), buffer zones (limited activity) and transition zones (human settlements). India has 18 notified Biosphere Reserves, 12 of which are on UNESCO's World Network.
- Endangered species
- are classified under IUCN categories: Critically Endangered (CR), Endangered (EN), Vulnerable (VU). India's Wildlife Protection Act 1972 lists species in Schedules I to IV (four since the 2022 amendment); Schedule I offers maximum protection.
- Biodiversity hotspots
- India hosts parts of four out of 36 global hotspots—Western Ghats & Sri Lanka, Indo-Burma (Northeast), Himalaya, and Sundaland (Nicobar Islands). These are defined by high endemism and significant habitat loss.
- Project Tiger
- (1973) and Project Elephant (1992) are flagship conservation programmes. As of 2023, India has 53 tiger reserves under Project Tiger.
- Endemic species
- are found only in India or specific regions within India. Examples: Lion-tailed Macaque (Western Ghats), Sangai deer (Manipur), Nilgiri Tahr (Western Ghats).
- Migratory species
- Siberian cranes (now extinct in India), Amur falcons (Nagaland), flamingos (Rann of Kutch, Chilika) and bar-headed geese (wetlands) come seasonally; protected under international conventions like CMS and Ramsar.
Important Government Programmes and Schemes of India — General Awareness · 7 cards
- Flagship vs. Umbrella schemes
- Flagship schemes are standalone programmes (e.g., PM-KISAN). Umbrella schemes bundle multiple sub-schemes under one framework (e.g., National Social Assistance Programme includes old-age pensions, widow pensions).
- Nodal Ministry
- Each scheme is administered by a specific Union Ministry. Knowing this helps eliminate wrong options. For example, agriculture schemes are under Ministry of Agriculture & Farmers Welfare, health schemes under Ministry of Health & Family Welfare.
- Beneficiary eligibility
- Most welfare schemes target specific groups — small/marginal farmers, BPL families, women, SC/ST, youth. Income ceilings (e.g., annual income below ₹1.5 lakh) and asset limits (e.g., landholding up to 2 hectares) are worth knowing.
- Launch year and renaming
- Some schemes are continuations or rebranding of older programmes. For example, PM Awas Yojana – Gramin (2016) replaced Indira Awas Yojana. Know both the current name and the year of launch/rebranding.
- Direct Benefit Transfer (DBT)
- Many schemes (PM-KISAN, PAHAL) use DBT to transfer benefits directly into beneficiaries' bank accounts via Aadhaar linkage. This reduces leakage.
- Convergence
- Some schemes converge multiple objectives — Ayushman Bharat addresses health insurance and primary care. Questions may test whether you understand the dual components (PM-JAY for insurance, Health and Wellness Centres for primary care).
- Centrally Sponsored vs. Central Sector
- Centrally Sponsored Schemes (CSS) involve cost-sharing between Centre and States (e.g., PMAY-Gramin 60:40, or 90:10 for North-Eastern and Himalayan States). Central Sector Schemes (CS) are 100% funded by the Centre (e.g., PM-KISAN).
Awards and Honours — General Awareness · 8 cards
- Civilian Awards
- India's civilian honours recognize exceptional service in any field. The hierarchy (highest to lowest) is Bharat Ratna → Padma Vibhushan → Padma Bhushan → Padma Shri. Padma Awards are announced on the occasion of Republic Day each year; the Bharat Ratna has no fixed date.
- Gallantry Awards
- Military and civilian bravery awards have three tiers. Wartime (descending): Param Vir Chakra, Maha Vir Chakra, Vir Chakra. Peacetime: Ashoka Chakra, Kirti Chakra, Shaurya Chakra. Param Vir Chakra is India's highest military decoration.
- Sports Awards
- Conferred by Ministry of Youth Affairs and Sports. Major categories: Khel Ratna (now renamed Major Dhyan Chand Khel Ratna, highest sports honour), Arjuna Award (outstanding performance), Dronacharya Award (coaches), Dhyan Chand Award (lifetime achievement), Rashtriya Khel Protsahan Puraskar (promotion of sports).
- Literary Awards
- Jnanpith Award is the highest literary honour in India, given for lifetime contribution to Indian literature in any of the 22 scheduled languages or English. Sahitya Akademi Awards recognize outstanding literary works annually in each language.
- Award Bodies
- President of India confers Bharat Ratna, Padma Awards and gallantry decorations. Sahitya Akademi (autonomous body under Ministry of Culture) gives Sahitya Akademi Awards. Jnanpith Award is given by Bharatiya Jnanpith organization (private trust). Sports Ministry confers National Sports Awards.
- Posthumous and Foreign Recipients
- Bharat Ratna and Padma Awards can be given posthumously and to foreign nationals. Examples: Nelson Mandela (Bharat Ratna), Khan Abdul Ghaffar Khan (Bharat Ratna). Gallantry awards are frequently posthumous.
- Award Frequency
- Bharat Ratna has a maximum of three awardees per year (often fewer). Padma Awards collectively can be up to 120 per year. Gallantry awards are announced twice yearly (Republic Day and Independence Day). Sports awards were traditionally presented on National Sports Day (29 August, birth anniversary of Dhyan Chand).
- Exam Pattern
- Know the most recent year's awardees and the highest award in each category. Questions on award order of precedence (e.g., "Which is higher: Padma Bhushan or Padma Vibhushan?") may also be asked. Always revise the current year's Republic Day and National Sports Day award lists.