A shelf has 20 books. 6 are borrowed and 3 returned. How many books are on it now?
Show answer and explanation
Answer: 17
Subtract borrowed books, then add returned books: 20 − 6 + 3.
LEARN · PRACTISE · CHALLENGE YOURSELF
NCERT quiz practice for Classes 1–12
Revise school concepts with original class-specific quizzes. Read sample questions with worked explanations, then practise a topic or review your mistakes.
Choose a class and revise one concept
Read the lesson, solve a few questions, and check the explanation before moving on. Mathematics and science practice support concept revision; English quizzes focus on language skills. The bank does not cover every exercise or every literature chapter in every NCERT edition.
Class 1 NCERT practice
Mathematics topics available: Number sense and place value, Addition and subtraction, Length and comparisons, Weight and capacity, Time and calendar, Money, Shapes and geometry.
Start Class 1 practice →A toy car moves when pushed. A seed does not move from place to place, but grows when cared for. Which is living?
Show answer and explanation
Answer: The seed
Growth and other life processes identify the seed as living. Movement caused by a push does not make the car living.
Class 2 NCERT practice
Mathematics topics available: Number sense and place value, Addition and subtraction, Multiplication and division, Length and comparisons, Weight and capacity, Time and calendar, Money, Shapes and geometry, Data handling and pictographs, Temperature.
Start Class 2 practice →A shelf has 80 books. 6 are borrowed and 3 returned. How many books are on it now?
Show answer and explanation
Answer: 77
Subtract borrowed books, then add returned books: 80 − 6 + 3.
An animal has six legs and three main body parts. A second has eight legs. Which one is an insect?
Show answer and explanation
Answer: Only the first
Insects have six legs. An eight-legged spider is not an insect.
Class 3 NCERT practice
Mathematics topics available: Number sense and place value, Addition and subtraction, Multiplication and division, Length and comparisons, Weight and capacity, Time and calendar, Money, Shapes and geometry, Fractions, Data handling and pictographs, Temperature.
Start Class 3 practice →A shelf has 120 books. 6 are borrowed and 3 returned. How many books are on it now?
Show answer and explanation
Answer: 117
Subtract borrowed books, then add returned books: 120 − 6 + 3.
A sealed packet of food is past its use-by date and smells unusual. Which is the sensible choice?
Show answer and explanation
Answer: Do not eat it; tell an adult
Sealing does not preserve every food forever. An unusual smell and expired use-by date are reasons not to eat it.
Class 4 NCERT practice
Mathematics topics available: Number sense and place value, Addition and subtraction, Multiplication and division, Length and comparisons, Weight and capacity, Time and calendar, Money, Shapes and geometry, Fractions, Perimeter and area, Symmetry, Data handling and pictographs.
Start Class 4 practice →A shelf has 160 books. 6 are borrowed and 3 returned. How many books are on it now?
Show answer and explanation
Answer: 157
Subtract borrowed books, then add returned books: 160 − 6 + 3.
A crowded room has closed windows and poor ventilation. Which change directly improves replacement of stale air?
Show answer and explanation
Answer: Open suitable windows or improve ventilation
Ventilation allows air exchange. Decoration does not address stale air.
Class 5 NCERT practice
Mathematics topics available: Number sense and place value, Addition and subtraction, Multiplication and division, Length and comparisons, Weight and capacity, Time and calendar, Money, Shapes and geometry, Fractions and decimals, Perimeter and area, Symmetry, Data handling and pictographs, Temperature, Angles, Decimals and conversions.
Start Class 5 practice →A shelf has 200 books. 6 are borrowed and 3 returned. How many books are on it now?
Show answer and explanation
Answer: 197
Subtract borrowed books, then add returned books: 200 − 6 + 3.
Plastic bags block a town’s drains before heavy rain. Which effect becomes more likely?
Show answer and explanation
Answer: Local flooding because runoff cannot drain easily
Blocked drains restrict flow; water can collect rapidly during rain.
Class 6 NCERT practice
Mathematics topics available: Patterns in Mathematics, Lines and Angles, Number Play, Data Handling and Presentation, Prime Time, Perimeter and Area, Fractions, Playing with Constructions, Symmetry, The Other Side of Zero.
Start Class 6 practice →Angles around a point are 40°, 20° and x°. Find x.
Show answer and explanation
Answer: 300
A complete turn is 360°. Subtract the two known angles.
Two seedlings are tested: P has fibrous roots and leaves with parallel veins; Q has a taproot and net-like veins. Which grouping fits these observations?
Show answer and explanation
Answer: P fits a typical monocot; Q fits a typical dicot
Parallel venation and fibrous roots are typical monocot features; taproots and reticulate venation are typical dicot features.
Class 7 NCERT practice
Mathematics topics available: Large Numbers Around Us, Arithmetic Expressions, Expressions using Letter-Numbers, Lines and Angles, Number Play, Triangles, Congruence of Triangles, Fractions, Decimals, Integers, Factors and Multiples, Data Handling, Constructions and Tilings, Simple Equations.
Start Class 7 practice →Evaluate 6 × 6 − 12 ÷ 3.
Show answer and explanation
Answer: 32
Do multiplication and division before subtraction.
On a sunny day the land warms faster than the nearby sea. Near the surface, which air movement helps form a sea breeze?
Show answer and explanation
Answer: Cooler air moves from sea toward land
Warm air rises over the warmer land; cooler sea air moves in near the surface.
Class 8 NCERT practice
Mathematics topics available: A Square and A Cube, Exponents and Powers, A Story of Numbers, Quadrilaterals, Number Play, We Distribute, Yet Things Multiply, Proportional Reasoning, Fractions in Disguise, The Baudhayana–Pythagoras Theorem, Exploring Some Geometric Themes, Data Handling, Algebra Play, Area.
Start Class 8 practice →Find the exponent x if 3ˣ = 3² × 3⁵ ÷ 3³.
Show answer and explanation
Answer: 4
For the same base, add exponents on multiplication and subtract on division: 2+5−3=4.
A test is repeated five times and gives 11, 10, 12, 11 and 40 units. What should be done with 40 first?
Show answer and explanation
Answer: Investigate a possible measurement or procedural error
An unusual value warrants checking the procedure and measurement. Transparent reasons are needed for excluding data.
Class 9 NCERT practice
Mathematics topics available: Number Systems, Polynomials, Algebraic Identities, Coordinate Geometry, Linear Equations in Two Variables, Introduction to Euclid’s Geometry, Lines and Angles, Sequences and Progressions, Triangles, Quadrilaterals, Areas of Parallelograms and Triangles, Circles, Area and Perimeter, Constructions, Surface Areas and Volumes, Statistics, Introduction to Probability.
Start Class 9 practice →Find the remainder when x³ + 2x + 1 is divided by x − 2.
Show answer and explanation
Answer: 13
By the remainder theorem use x=2: 8+4+1.
A 2 kg trolley at 3 m/s collides and sticks to a stationary 1 kg trolley. Ignore external horizontal forces. Find their common speed.
Show answer and explanation
Answer: 2 m/s
Momentum is conserved: 2×3=(2+1)v, so v=2 m/s.
Class 10 NCERT practice
Mathematics topics available: Real Numbers, Polynomials, Pair of Linear Equations in Two Variables, Quadratic Equations, Arithmetic Progressions, Triangles, Coordinate Geometry, Introduction to Trigonometry, Some Applications of Trigonometry, Circles, Areas Related to Circles, Surface Areas and Volumes, Statistics, Probability.
Start Class 10 practice →The roots of x²−5x+2 are α and β. Find 1/α+1/β.
Show answer and explanation
Answer: 2.5
(α+β)/(αβ)=5/2. Answer rounded to 8 decimal places.
A metal displaces copper from copper sulfate but cannot displace zinc from zinc sulfate. What reactivity order is consistent?
Show answer and explanation
Answer: Zinc > metal > copper
Displacing copper puts the metal above copper; failing to displace zinc places it below zinc under suitable conditions.
Class 11 NCERT practice
Mathematics topics available: Sets, Relations and Functions, Logarithms, Principle of Mathematical Induction, Complex Numbers and Quadratic Equations, Linear Inequalities, Sequences and Series, Trigonometry, Straight Lines, Conic Sections, Permutations and Combinations, Binomial Theorem, Statistics, Limits and Derivatives, Probability, Introduction to 3-D Geometry.
Start Class 11 practice →f(x)=2x+2. Find f(f(1)).
Show answer and explanation
Answer: 10
f(1)=4; f(4)=10.
A spring of stiffness 200 N/m is compressed by 0.10 m. What kinetic energy can it ideally give a released block?
Show answer and explanation
Answer: 1 J
Stored energy=½kx²=½×200×0.01=1 J; ideal conversion preserves energy.
Class 12 NCERT practice
Mathematics topics available: Relations and Functions, Inverse Trigonometric Functions, Matrices, Determinants, Continuity and Differentiability, Application of Derivatives, Integrals, Application of Integrals, Differential Equations, Vector Algebra, Three Dimensional Geometry, Linear Programming, Probability.
Start Class 12 practice →Find the principal value of cos⁻¹(−1/2).
Show answer and explanation
Answer: 2π/3
cos⁻¹ has range [0,π]; the angle with cosine −1/2 is 2π/3.
A small magnetic dipole is in a uniform magnetic field at 90° to the field. Which is correct?
Show answer and explanation
Answer: Torque is maximum; net force is zero
In a uniform field, equal opposite forces give zero resultant; τ=mB sinθ is maximum at 90°.
Use your textbook alongside practice
NCERT editions and chapter sequences change. Match the topic to your own book, and use the official textbook links to revisit a definition or example. For textbook exercises, browse English and Hindi solution resources.