Class 9 practice questions with worked answers

Class 9 practice by subject

• Class 9 Maths
• Class 9 Physics
• Class 9 Chemistry

Maths: Polynomials

• Remainder theorem and factor theorem
• Factorising by splitting the middle term
• Cube identities
• Value and zeroes of a polynomial

Maths: Heron's Formula

• Area of a triangle by Heron's formula

Maths: Number Systems

• Rationalising the denominator
• Recurring decimals to fractions
• Simplifying surds
• Rational exponents

Maths: Coordinate Geometry

• Quadrants, axes and plotting points

Maths: Linear Equations in Two Variables

• Solutions of ax + by = c
• Intercepts of a straight line

Maths: Circles

• Angle at the centre and in the same segment
• Cyclic quadrilaterals

Maths: Surface Areas and Volumes

• Spheres and hemispheres

Maths: Statistics

• Mean from a frequency table
• Range, and how the mean changes

Physics: Motion

• Equations of motion numericals
• Average speed, velocity and km/h ↔ m/s
• Reading velocity–time graphs
• Speed in uniform circular motion

Physics: Force and Laws of Motion

• Newton's second law and momentum
• Conservation of momentum and recoil
• Net force and acceleration

Physics: Work and Energy

• Work, kinetic energy and potential energy
• Kinetic and potential energy
• Power and the kilowatt-hour
• Work done by a force at an angle

Physics: Gravitation

• Pressure and thrust
• Universal law of gravitation
• Free fall
• Density, relative density and buoyancy

Physics: Sound

• Wave speed, frequency and wavelength
• Frequency, time period and audible range

Chemistry: Atoms and Molecules

• Mole concept numericals
• Molecular and formula unit mass
• Moles, mass and number of particles
• Writing formulae using valency

Chemistry: Structure of the Atom

• Electronic configuration and valency
• Protons, neutrons, electrons and isotopes

About these answers

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