# Hi, I'm Vikash, I study in Class 8

And I Learn My Subjects Easily With Vikrant Academy®

## Hi, I'm Vikash, I study in Class 8

And I Learn My Subjects Easily With Vikrant Academy®

# MATHEMATICS

**Chapter 1: **Rational Numbers

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# Question & Answers (Solved)

## Chapter – 2: Polynomials

Exercise 2.1 1. Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer. (i) 4×2–3x+7 Solution: The equation 4×2–3x+7 can be written as 4×2–3×1+7×0 Since x is the only variable…

## Chapter – 6: Lines and Angles

Exercise: 6.1 1. In Fig. 6.13, lines AB and CD intersect at O. If ∠AOC +∠BOE = 70° and ∠BOD = 40°, find ∠BOE and reflex ∠COE. Solution: From the diagram, we have (∠AOC +∠BOE +∠COE) and…

## Chapter – 10: Circles

Exercise: 10.1 1. Fill in the blanks: (i) The centre of a circle lies in ____________ of the circle. (exterior/ interior) (ii) A point, whose distance from the centre of a circle is greater than its radius…

## Chapter – 11: Constructions

Exercise 11.1 1. Construct an angle of 90° at the initial point of a given ray and justify the construction. Construction Procedure: To construct an angle 90°, follow the given steps: 1. Draw a ray OA 2….

## Chapter – 1: Rational Number

Exercise 1.1 1. Using appropriate properties find. (i) -2/3 × 3/5 + 5/2 – 3/5 × 1/6 Solution: – -2/3 × 3/5 + 5/2 – 3/5 × 1/6 = -2/3 × 3/5– 3/5 × 1/6+ 5/2 =…

## Chapter – 2: Linear Equations in One Variable

Exercise 2.1 Solve the following equations. 1. x – 2 = 7 Solution: – x – 2 = 7 x=7+2 x=9 2. y + 3 = 10 Solution: – y + 3 = 10 y = 10…

## Chapter – 3: Understanding Quadrilaterals

Exercise 3.1 1. Given here are some figures. Classify each of them on the basis of the following. Simple curve (b) Simple closed curve (c) Polygon (d) Convex polygon (e) Concave polygon Solution: – a) Simple curve:…

## Chapter – 4: Practical Geometry

Exercise 4.1 1. Construct the following quadrilaterals. (i) Quadrilateral ABCD AB = 4.5 cm BC = 5.5 cm CD = 4 cm AD = 6 cm AC = 7 cm Solution: – The rough sketch of the…

## Chapter – 5: Data Handling

Exercise 5.1 1. For which of these would you use a histogram to show the data? (a) The number of letters for different areas in a postman’s bag. (b) The height of competitors in an athletics meet….

## Chapter – 6: Squares and Square Roots

Exercise 6.1 1. What will be the unit digit of the squares of the following numbers? i. 81 ii. 272 iii. 799 iv. 3853 v. 1234 vi. 26387 vii. 52698 viii. 99880 ix. 12796 x. 55555 Solution:…

## Chapter – 7: Cube and Roots

Exercise 7.1 1. Which of the following numbers are not perfect cubes? (i) 216 Solution: – By resolving 216 into prime factor, 216 = 2×2×2×3×3×3 By grouping the factors in triplets of equal factors, 216 = (2×2×2)×(3×3×3)…

# SCIENCE

**CHAPTER 1**

CROP PRODUCTION AND MANAGEMENT

MICROORGANISMS : FRIEND AND FOE

SYNTHETIC FIBRES AND PLASTICS

MATERIALS : METALS AND NON-METALS

COAL AND PETROLEUM

COMBUSTION AND FLAME

CONSERVATION OF PLANTS AND ANIMALS

CELL — STRUCTURE AND FUNCTIONS

REPRODUCTION IN ANIMALS

REACHING THE AGE OF ADOLESCENCE

FORCE AND PRESSURE

FRICTION

SOUND

CHEMICAL EFFECTS OF ELECTRIC CURRENT

SOME NATURAL PHENOMENA

LIGHT

STARS AND THE SOLAR SYSTEM

POLLUTION OF AIR AND WATER