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Class 10 · Science · Chapter 10

Find the power of a concave lens whose focal length is 25 cm.

Class 9 · Science · Chapter 8

A car speeds up uniformly from 18 km/h to 36 km/h in 5 s. Find its acceleration and the distance it covers in this time.

Class 9 · Maths · Chapter 2

Is 4x² − 3x + 7 a polynomial in one variable? Write its degree.

Class 9 · Maths · Chapter 1

Explain how √2 can be located on the number line using a right-angled triangle.

Class 10 · Science · Chapter 1

Describe what you observe when a zinc strip is dipped in copper sulphate solution, and explain why it happens.

Class 10 · Science · Chapter 10

Why does a pencil appear bent when partly dipped in water?

Class 10 · Maths · Chapter 4

The product of two consecutive positive integers is 306. Form and solve the equation.

Class 9 · Science · Chapter 8

A car starting from rest reaches 20 m/s in 5 s. Find its acceleration and the distance covered.

Class 9 · Maths · Chapter 1

Find one rational number between 1/3 and 1/2.

Class 10 · Science · Chapter 1

What is rancidity and how can it be prevented?

Class 10 · Science · Chapter 1

A chemical equation must be balanced because matter cannot be created or destroyed — the number of atoms of each element must be the same o…

Class 9 · Science · Chapter 9

Balanced forces do not change the state of motion of an object; unbalanced forces do. Newton's first law states that an object stays at res…

Class 10 · Maths · Chapter 3

A pair of linear equations a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0 can be solved graphically or algebraically. Graphically, the two lines…

Class 10 · Maths · Chapter 2

The zeroes of a polynomial are the x-values where its graph meets the x-axis. A quadratic polynomial has at most 2 zeroes and a cubic has a…

Class 9 · Science · Chapter 1

Matter is made of very small particles that have space between them, are constantly moving and attract one another. Solids have a fixed sha…

Class 10 · Science · Chapter 1

Combination: A + B → AB Decomposition: AB → A + B Displacement: A + BC → AC + B Double displacement: AB + CD → AD + CB Oxidation: gain of o…

Class 10 · Science · Chapter 10

Mirror formula: 1/v + 1/u = 1/f Magnification (mirror): m = −v/u = h′/h Focal length of a spherical mirror: f = R/2 Lens formula: 1/v − 1/u…

Class 10 · Maths · Chapter 3

General pair: a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0 Unique solution (intersecting lines): a₁/a₂ ≠ b₁/b₂ No solution (parallel lines): a…

Class 9 · Science · Chapter 9

Force: F = ma (SI unit: newton, N) Momentum: p = mv (SI unit: kg·m/s) Second law: F = (mv − mu)/t Impulse: F × t = mv − mu (change in momen…

Class 9 · Maths · Chapter 4

Standard form: ax + by + c = 0, a and b not both zero Solution: ordered pair (x, y) satisfying the equation Number of solutions: infinitely…

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