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NCERT Solutions for Class 9
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Posts in category Class 9

Triangles

Triangles

Chapter – 7 : Triangles   Exercise 1 Question 1: In quadrilateral PQRS, PR = PQ and PQ bisects (look at the fig.). Show that the . What can you say about QR and QS? Solution: In and , we have PR = PS (PQ bisects ) PQ = PQ (common) (By SAS congruence) Hence […]

Force and Laws of Motion

Force and Laws of Motion

Chapter –  9 : Force and Laws of Motion   1. Choose the one which has more inertia.      i-A Toy thrown up by a boy (or) A coin thrown up by a boy     ii-An apple falling from a tree (or) A rose falling from a plant     iii-A motorcycle (or) A bus Answer […]

Statistics

Statistics

Chapter-14: Statistics    Exercise 1 Q1) Give 5 scenarios of day to day life from which any type of data can be collected. Solution: Daily life activities from where data can be collected are as follows: (i) Daily household expenditure (ii) Rainfall happening in your area (iii) Electricity bill of monthly (iv) Voting results or […]

Number Systems

Number Systems

Chapter-1: Number systems   1) Prove that zero as a rational number. Write zero in p/q, where p and q are integers and q ≠ 0? Answer: Yes. Zero is a rational number and it can be represented as . 2) In between 3 and 4, find six rational numbers. Answer: There are an infinite number of rational numbers between the numbers […]

Motion

Motion

Chapter-8: Motion   Questions: 1) A man walks around a square street of side 10 m in 40 sec. Calculate the displacement of the man at the end of 2 minutes 20 seconds. Soln: The man takes 40 sec to cover ( 4 * 10 ) 40 metres. This shows he covers one metre in […]

Quadrilaterals

Quadrilaterals

Chapter – 8 : Quadrilaterals   Q1. The angles of quadrilateral are in the ratio . Find the angles of the quadrilateral. Solution: Let the common ratio between the angles be x. We know that the ‘Sum of the interior angles of the quadrilateral’ = Now, Therefore the Angles of the quadrilateral are:   Q2. […]

Coordinate Geometry

Coordinate Geometry

Chapter- 3: Coordinate Geometry   Exercise 1 Q1. How will you describe the position of a mobile phone kept on the study table to another person? Solution: For describing the position of a mobile phone kept on the study table, we take two lines, a perpendicular and a horizontal line. Considering the table as a […]

Polynomials

Polynomials

Chapter-2 : Polynomials   Exercise – 1 Q.1.Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer: (i) Answer: It is a polynomial in one variable.   (ii) Answer: It is a polynomial in one variable.   (iii) Answer: It is not a polynomial since the […]

Sound

Sound

Chapter-12: Sound   Que.1. When an object vibrates in a medium, it produces sound which reaches our ear. Explain how it is done. Ans. Sound propagates through air which is a medium. When the prongs of a tuning fork vibrate, they disturb the air molecules in the surrounding. When it moves forward, the molecules in […]

Introduction to Euclid’s Geomet...

Introduction to Euclid’s Geometry

Chapter-5: Introduction to Euclid’s Geometry    Exercise 5:1 Question 1 : State true or false for the following statements mentioned below with the reason: a: Through a single point only one line can be passed. b: Through two distinct lines there are infinite number of lines that can be passed. c: A line that is […]

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