Mathematics Class VIII

Rational Numbers

4 Topics | 3 Quizzes

Introduction – Rational Numbers

Properties of Rational Numbers

Representation of Rational Numbers on the Number Line

Rational Number between Two Rational Numbers

Concept Checkers – Rational Numbers – Class VIII

Practice Questions – Rational Numbers – Class VIII

Olympiad Questions – Rational Numbers – Class VIII

Linear Equations in One Variable

6 Topics | 3 Quizzes

Introduction – Linear Equation in One Variable

Linear Equation in One Variable

Some Important points related to Linear Equations

Applications of Linear Equation

Reducing Equations to Simpler Form

Equations Reducible to the Linear Form

Concept Checkers – Linear equations in one variable – Class VIII

Practice Questions – Linear equations in one variable – Class VIII

Olympiad Questions – Linear equations in one variable – Class VIII

Understanding Quadrilaterals

5 Topics | 3 Quizzes

Some of the Measures of the Exterior Angles of a Polygon

Kinds of Quadrilaterals

Some Special Parallelograms

Concept Checkers – Understanding quadrilaterals – Class VIII

Practice Questions – Understanding quadrilaterals – Class VIII

Olympiad Questions – Understanding Quadrilaterals – Class VIII

Practical Geometry

3 Topics

Constructing a Quadrilateral

Some Special Cases

Visualising Solid Shapes

3 Topics | 1 Quiz

View of 3D-Shapes

Faces, Edges and Vertices

Concept Checkers – Visualising Solid Shapes – Class VIII

5 Topics | 3 Quizzes

Introduction to Data Handling

Organising Data

Circle Graph or Pie Chart

Chance and Probability

Concept Checkers -Data Handling – Class VIII

Practice Questions -Data Handling – Class VIII

Olympiad Questions – Data Handling – Class VIII

Squares and Square Roots

4 Topics | 3 Quizzes

Properties of Square Numbers

Square Roots of Perfect Squares

FINDING SQUARE ROOTS BY Prime Factorization

Concept Checkers – Square and Square Roots – Class VIII

Practice Questions – Square and Square Roots – Class VIII

Olympiad Questions -Square and Square Roots – Class VIII

Cubes and Cube Roots

3 Topics | 3 Quizzes

Concept Checkers -Cubes and Cube roots – Class VIII

Practice Questions -Cubes and Cube roots – Class VIII

Olympiad Questions -Cubes and Cube roots – Class VIII

Comparing Quantities

6 Topics | 2 Quizzes

Recalling Ratios and Percentages

Finding the Increase and Decrease Percent

Finding Discounts

Terms Related to Buying and Selling (Profit and Loss)

Simple Interest and compound interest

The Formula for Compound Interest

Concept Checkers – Comparing Quantities – Class VIII

Olympiad Questions – Comparing Quantities – Class VIII

Algebraic Expressions and Identities

10 Topics | 3 Quizzes

What are Expressions?

Terms, Factors and Coefficients

Monomials, Binomials and Polynomials

Like and Unlike Terms

Addition and Subtraction of Algebraic Expressions

Multiplication of Algebraic Expressions: Introduction

Multiplying a Monomial by a Monomial

Multiplying a Monomial by a Polynomial

Multiplying a Polynomial by a Polynomial

What is an Identity?

Concept Checkers -Algebraic expression and identities – Class VIII

Practice Questions – Algebraic expressions and identities – Class VIII

Olympiad Questions – Algebraic expressions and identities – Class VIII

8 Topics | 3 Quizzes

Area of Trapezium

Area of General Quadrilateral

Area of Special Quadrilaterals (Rhombus)

Solid Shapes and Surface Area

Surface Area of Cube, Cuboid and Cylinder

Volume of Cube, Cuboid and Cylinder

Volume and Capacity

Concept Checkers -Mensuration – Class VIII

Practice Questions -Mensuration – Class VIII

Olympiad Questions – Mensuration – Class VIII

Exponents and Powers

4 Topics | 3 Quizzes

Powers with Negative Exponents

Laws of Exponents

Comparing Very Large and Very Small Numbers

Concept Checkers – Exponents and Powers – Class VIII

Practice Questions – Exponents and Powers – Class VIII

Olympiad Questions – Exponents and Powers – Class VIII

Direct and Inverse Proportions

3 Topics | 3 Quizzes

Direct Proportion

Inverse Proportion

Concept Checkers -Direct and inverse proportion – Class VIII

Practice Questions – Direct and inverse proportions – Class VIII

Olympiad Questions – Direct and inverse proportions – Class VIII

4 Topics | 3 Quizzes

Factors of Algebraic Expressions

Methods of Factorisation

Division of Algebraic Expressions

Concept Checkers – Factorization – Class VIII

Practice Questions – Factorization – Class VIII

Olympiad Questions – Factorization – Class VIII

Playing with Numbers

3 Topics | 3 Quizzes

Numbers in General Form

Letters for Digits

Divisibility Rules

Concept Checkers – Playing with numbers – Class VIII

Practice Questions – Playing with numbers – Class VIII

Olympiad Questions – Playing with numbers – Class VIII

Mock Test 1 – Class VIII

Mock Test 2 – Class VIII

Mock Test 3 – Class VIII

Practice Questions – Direct and inverse proportions – Class VIII

Mathematics Class VIII Direct and Inverse Proportions Practice Questions – Direct and inverse proportions – Class VIII

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Question 1 of 15

1. Question
If \(A:B=1:3 \) and \(B:C=4:5 \) then \(C:A= \)
- \(15:8 \)
- \(12:10 \)
- \(8:5 \)
- \(8:15 \)
Correct

Incorrect

Hint

$\dfrac{A}{B}=\dfrac{2}{3}\Rightarrow B=\dfrac{3}{2}A\\ \\ B:C=4:5\\ \\ \dfrac{B}{C}=\dfrac{4}{5}\Rightarrow \dfrac{\dfrac{3}{2}A}{C}=\dfrac{4}{5}\\ \\ \Rightarrow \dfrac{3A}{2C}=\dfrac{4}{5}\\ \\ \Rightarrow \dfrac{A}{C}=\dfrac{8}{15}\\ \\ \dfrac{C}{A}=\dfrac{15}{8}$
Question 2 of 15

2. Question
\(\text{When}\quad x=2,7,11….\\ \\ \quad y=8,28,44…. \)
Then \(x \) and \(y \) are is
- Direct proportion
- Inverse proportion
- Neither (a) nor (b)
- None of these
Correct

Incorrect

Hint

$\dfrac{x}{y}=\dfrac{2}{8}=\dfrac{7}{28}=\dfrac{11}{44}=$ constant
Question 3 of 15

3. Question
Two quantities x and y vary inversely with each other then
- \(\dfrac{x}{y} \) remains constant
- \(x-y \) remains constant
- \(x+y \) remains constant
- \(x\times y \) remains constant
Correct

Incorrect
Question 4 of 15

4. Question
8 men can do a piece of work in 10 days. How long will 10 men take?
- 12 days
- 8 days
- 7 days
- 6 days
Correct

Incorrect

Hint

$8\times10=10\times x\\ \\ \Rightarrow x=8\ days$
Question 5 of 15

5. Question
An agent receives a commession of Rs. 73 on sales of Rs. 1000. The commesion he will get on sales of Rs. 100 is
- Rs. 7.30
- Rs. 7
- Rs. 6
- Rs. 8
Correct

Incorrect

Hint

$1000\times y=73\times100\\ \\ y=\dfrac{73\times100}{1000}=7.30$
Question 6 of 15

6. Question
In a party, on an average, 5 bottles of coke are served for a group of 6 children. How many friends were present at Mohit’s party if 15 bottles of coke were used?
- 18
- 24
- 30
- 12
Correct

Incorrect

Hint

Number of children $=\dfrac{15\times6}{5}=18$
Question 7 of 15

7. Question
In a camp there is sufficient food for 105 soldiers for 21 days. If 42 soldiers leave the camp, how long would the food last?
- 30
- 35
- 65
- 45
Correct

Incorrect

Hint

$105\times21=63\times y\\ \\ y=\dfrac{105\times21}{63}=35$
Question 8 of 15

8. Question
A shopkeeper has just enough money to buy 52 cycles worth Rs. 525 each. If each cycle were to cost Rs 21 more then number of cycles, he will be able to buy with that amount of money is
- 40
- 30
- 50
- 20
Correct

Incorrect

Hint

Cost of 52 cycles $=525\times52=\text{Rs.}\ 27300$
New cost of one cycle $=(525+21)=\text{Rs.}\ 546$
Number of cycles $=\dfrac{27300}{546}=50$
Question 9 of 15

9. Question
A labourer is paid Rs. 806 for 13 days of work. If he receives Rs. 1798 for how many days did he work?
- 29
- 35
- 60
- 40
Correct

Incorrect

Hint

Let number of days $=y$
$\dfrac{806}{13}=\dfrac{1798}{y}\\ \\ \Rightarrow y=\dfrac{1798\times13}{806}=29$
Question 10 of 15

10. Question
A van covers 432 km with 36 litres of diesel. How much diesel would it cover with 25 litres of diesel?
- 200 km
- 300 km
- 100 km
- 350 km
Correct

Incorrect

Hint

$36\ \text{litres}\rightarrow 432\ km\\ \\ 25\ \text{litres}\rightarrow \dfrac{25\times432}{36}=12\times25=300$
Question 11 of 15

11. Question
If the cost of 27 bags of paddy is Rs. 9450. What is the cost of 36 bags of paddy?
- Rs. 12000
- Rs. 12600
- Rs. 16200
- Rs. 10620
Correct

Incorrect

Hint

Cost of 27 bags $=9450$
Cost of 1 bags $=\dfrac{9450}{27}$
Cost of 36 bags $=\dfrac{9450}{27}\times36=\text{Rs.}\ 12600$
Question 12 of 15

12. Question
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm. What is the actual length of the bacteria?
- \(2\times10^{-4}\ \text{cm} \)
- \(10^{3}\ \text{cm} \)
- \(10^{-4}\ \text{cm} \)
- \(10^{4}\ \text{cm} \)
Correct

Incorrect

Hint

$\dfrac{50000}{5}=\dfrac{1}{x}\\ \\ \Rightarrow x=\dfrac{5}{50000}=10^{-4}\ \text{cm}$
Question 13 of 15

13. Question
Raghav has enough money to buy 75 machine worth Rs. 200 each. How many machines can he buy if he gets a discount of Rs. 50 on each machine
- 180
- 200
- 150
- 100
Correct

Incorrect

Hint

$200-50=150\\ \\ 75\times200=y\times150\\ \\ y=\dfrac{75\times200}{150}=100$
Question 14 of 15

14. Question
In 15 days the earth picks up \(1.2 \times 10^8\ \text{kg}\) of the dust from the atmosphere. In how many days it will picks up \(4.8 \times 10^8\ \text{kg}\) of dust?
- 50
- 40
- 60
- 100
Correct

Incorrect

Hint

$x=\dfrac{1.5}{1.2\times10^8}\times4.8\times10^8\\ \\ =\dfrac{15\times48}{12}=60\ \text{days}$
Question 15 of 15

15. Question
A car takes 3 hours to reach a place by travelling at 60 km/hr. How long will it take to travel at a speed of 90 km/hr
- 1 hour 30 min
- 1 hour 40 min
- 2 hours
- 1 hour
Correct

Incorrect

Hint

$\text{Time}=\dfrac{60}{90}\times3=2\ \text{hours}$

Practice Questions - Direct and inverse proportions - Class VIII

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