Maths Quiz for Class 8 – 70 Questions and Answers​

Welcome to the Class 8 Math Question Bank. This resource is packed with carefully chosen problems to boost your skills. The questions cover key topics and range from simple to advanced levels. Each one helps you think better and calculate faster.

How It’s Organized

• Step-Up Section (1-45): Start with simple math problems. Gradually, work on tougher concepts like algebra, geometry, and data handling.
• Achiever Section (46-70): These are tricky, high-level questions. They’re meant to challenge you and build confidence in solving tough problems.

Why Practice Here?

Math is everywhere. It helps you manage money, plan trips, and think logically. A famous quote by Galileo says, “Mathematics is the language in which God has written the universe.” Practicing these questions prepares you for real-life tasks and exams.

What You’ll Do

Solve multiple-choice questions and check answers hidden under collapsible sections. Topics include percentages, ratios, and volume. Practice at your own speed and track your progress. Mistakes? No problem—they’re your best teacher.

By the time you finish, you’ll feel more confident tackling math. Ready to get started? Let’s begin solving!

Class 8 Math Quiz: 65 Challenging MCQ Questions

Question 1. Which of the following is the additive identity for rational numbers?

a) 1
b) 0
c) -1
d) None of these

Answer:

b) 0

Question 2. Find the multiplicative inverse of 7.

a) 1/7
b) 7
c) -7
d) None of these

Answer:

a) 1/7

Question 3. What is the product of two negative rational numbers?

a) Positive rational number
b) Negative rational number
c) Zero
d) None of these

Answer:

a) Positive rational number

Question 4. Simplify: (5/8) + (3/8).

a) 1
b) 1/2
c) 8/8
d) 5/8

Answer:

c) 8/8

Question 5. Which of the following is a linear equation in one variable?

a) x + 5 = 7
b) y² + 3 = 5
c) 2x – y = 5
d) None of these

Answer:

a) x + 5 = 7

Question 6. Solve for x: 2x + 5 = 15.

a) 5
b) 10
c) 20
d) None of these

Answer:

a) 5

Question 7. What is the sum of the interior angles of a triangle?

a) 90°
b) 180°
c) 360°
d) 120°

Answer:

b) 180°

Question 8. Find the value of x: 7x – 14 = 0.

a) 2
b) -2
c) 0
d) None of these

Answer:

a) 2

Question 9. What is the perimeter of a rectangle with length 5 cm and breadth 3 cm?

a) 16 cm
b) 15 cm
c) 8 cm
d) 10 cm

Answer:

a) 16 cm

Question 10. Which of the following is a rational number?

a) √2
b) 1/3
c) π
d) None of these

Answer:

b) 1/3

Question 11. A polygon with 6 sides is called:

a) Quadrilateral
b) Pentagon
c) Hexagon
d) Heptagon

Answer:

c) Hexagon

Question 12. Solve for x: 5x = 20.

a) 4
b) 2
c) 5
d) None of these

Answer:

a) 4

Question 13. What is the probability of getting a head when tossing a coin?

a) 0
b) 1
c) 1/2
d) None of these

Answer:

c) 1/2

Question 14. Find the area of a rectangle with length 7 cm and breadth 4 cm.

a) 28 cm²
b) 21 cm²
c) 14 cm²
d) None of these

Answer:

a) 28 cm²

Question 15. What is the reciprocal of -4/5?

a) -5/4
b) 5/4
c) 4/5
d) None of these

Answer:

a) -5/4

Question 16. Simplify: (3/4) × (8/9).

a) 1/3
b) 2/3
c) 4/9
d) 2/9

Answer:

b) 2/3

Question 17. Solve for x: 3x – 7 = 11.

a) 4
b) 6
c) 7
d) None of these

Answer:

b) 6

Question 18. Which of the following numbers is not a rational number?

a) 0
b) √7
c) -5/6
d) 1.5

Answer:

b) √7

Question 19. The sum of the angles of a quadrilateral is:

a) 180°
b) 360°
c) 270°
d) 90°

Answer:

b) 360°

Question 20. Find the value of x: 8x = 64.

a) 6
b) 8
c) 10
d) None of these

Answer:

b) 8

Question 21. The LCM of 4 and 6 is:

a) 12
b) 8
c) 24
d) None of these

Answer:

a) 12

Question 22. A rectangle has a length of 12 cm and breadth of 4 cm. What is its area?

a) 48 cm²
b) 40 cm²
c) 50 cm²
d) 44 cm²

Answer:

a) 48 cm²

Question 23. Solve for y: 2y + 3 = 9.

a) 2
b) 3
c) 4
d) None of these

Answer:

c) 4

Question 24. Convert 0.75 into a fraction.

a) 3/4
b) 1/2
c) 7/10
d) 5/8

Answer:

a) 3/4

Question 25. A parallelogram has a base of 10 cm and height of 5 cm. What is its area?

a) 20 cm²
b) 25 cm²
c) 50 cm²
d) 30 cm²

Answer:

c) 50 cm²

Question 26. What is the probability of rolling a 6 on a standard die?

a) 1/6
b) 1/4
c) 1/3
d) None of these

Answer:

a) 1/6

Question 27. Simplify: (2/3) ÷ (4/5).

a) 5/6
b) 3/10
c) 4/15
d) None of these

Answer:

a) 5/6

Question 28. A triangle has sides 3 cm, 4 cm, and 5 cm. What is its perimeter?

a) 12 cm
b) 10 cm
c) 9 cm
d) None of these

Answer:

a) 12 cm

Question 29. Solve for x: 5x + 3 = 18.

a) 3
b) 4
c) 2
d) None of these

Answer:

b) 3

Question 30. What is the value of 2³?

a) 8
b) 6
c) 9
d) 4

Answer:

a) 8

Question 31. Solve for x: 4(x – 2) = 16.

a) 4
b) 5
c) 6
d) None of these

Answer:

a) 4

Question 32. If the angles of a triangle are in the ratio 2:3:5, what is the largest angle?

a) 50°
b) 90°
c) 60°
d) 45°

Answer:

b) 90°

Question 33. The perimeter of a square is 40 cm. What is the length of one side?

a) 5 cm
b) 10 cm
c) 20 cm
d) None of these

Answer:

b) 10 cm

Question 34. Find the value of 7 × (2² + 3³).

a) 133
b) 143
c) 153
d) None of these

Answer:

a) 133

Question 35. A shopkeeper sells 5 pens for Rs 60. What is the cost of one pen?

a) Rs 12
b) Rs 10
c) Rs 15
d) Rs 20

Answer:

a) Rs 12

Question 36. The area of a circle is 154 cm². Find its radius (π = 22/7).

a) 7 cm
b) 14 cm
c) 21 cm
d) None of these

Answer:

a) 7 cm

Question 37. Simplify: (5/6) + (7/12).

a) 3/4
b) 19/12
c) 6/13
d) 23/18

Answer:

b) 19/12

Question 38. A train travels 240 km in 4 hours. What is its speed?

a) 40 km/h
b) 50 km/h
c) 60 km/h
d) 70 km/h

Answer:

c) 60 km/h

Question 39. Solve for y: y/3 – 5 = 7.

a) 12
b) 18
c) 36
d) 10

Answer:

b) 18

Question 40. What is the HCF of 24 and 36?

a) 6
b) 12
c) 18
d) None of these

Answer:

b) 12

Question 41. If the simple interest for 2 years on Rs 5000 is Rs 400, what is the rate of interest?

a) 5%
b) 4%
c) 6%
d) 8%

Answer:

b) 4%

Question 42. Find the volume of a cube with side length 6 cm.

a) 216 cm³
b) 128 cm³
c) 64 cm³
d) 150 cm³

Answer:

a) 216 cm³

Question 43. Solve for x: 5x – 4 = 2x + 8.

a) 4
b) 5
c) 6
d) None of these

Answer:

a) 4

Question 44. What is the total surface area of a cube with side length 3 cm?

a) 36 cm²
b) 54 cm²
c) 72 cm²
d) None of these

Answer:

b) 54 cm²

Achiever Section

Question 45. A car covers 450 km in 5 hours. What is its average speed?

a) 80 km/h
b) 85 km/h
c) 90 km/h
d) 75 km/h

Answer:

c) 90 km/h

Question 46. Solve for x: 2x + 5 = 3(x – 4).

a) 7
b) 9
c) 5
d) None of these

Answer:

c) 5

Question 47. A cone has a base radius of 7 cm and height of 24 cm. Find its volume (π = 22/7).

a) 1232 cm³
b) 1100 cm³
c) 1234 cm³
d) None of these

Answer:

a) 1232 cm³

Question 48. A sum of Rs 10,000 is invested at 5% per annum simple interest. Find the total amount after 4 years.

a) Rs 12,000
b) Rs 11,000
c) Rs 12,500
d) None of these

Answer:

a) Rs 12,000

Question 49. Two numbers are in the ratio 3:5. If their sum is 64, find the larger number.

a) 24
b) 40
c) 32
d) None of these

Answer:

b) 40

Question 50. Solve: √(81) + √(64).

a) 18
b) 19
c) 17
d) 16

Answer:

a) 17

Question 51. The surface area of a sphere is 616 cm². Find its radius (π = 22/7).

a) 7 cm
b) 14 cm
c) 21 cm
d) None of these

Answer:

a) 7 cm

Question 52. If 5 men can complete a task in 12 days, how many days will it take for 3 men to finish the same task?

a) 20 days
b) 30 days
c) 24 days
d) 18 days

Answer:

c) 20 days

Question 53. Find the probability of rolling a multiple of 3 on a standard die.

a) 1/6
b) 1/3
c) 1/2
d) 1/4

Answer:

b) 1/3

Question 54. A train travels 132 km in 1.5 hours. Find its average speed.

a) 80 km/h
b) 88 km/h
c) 85 km/h
d) 90 km/h

Answer:

b) 88 km/h

Question 55. Simplify: (3x/4) ÷ (9/16).

a) 4x/3
b) 12x/9
c) 4x/12
d) 3x/12

Answer:

a) 4x/3

Question 56. The area of a triangle is 50 cm², and its base is 10 cm. Find its height.

a) 15 cm
b) 12 cm
c) 10 cm
d) None of these

Answer:

c) 10 cm

Question 57. Solve for x: 7x – 5 = 2x + 20.

a) 6
b) 5
c) 7
d) None of these

Answer:

a) 5

Question 58. A cube has a surface area of 294 cm². Find its side length.

a) 7 cm
b) 14 cm
c) 21 cm
d) None of these

Answer:

a) 7 cm

Question 59. The diagonals of a rhombus are 8 cm and 6 cm. Find its area.

a) 24 cm²
b) 48 cm²
c) 28 cm²
d) None of these

Answer:

b) 24 cm²

Question 60. The ratio of boys to girls in a class is 3:4. If there are 35 students, how many are girls?

a) 15
b) 20
c) 28
d) 25

Answer:

b) 20

Question 61. Solve for x: 3(x – 4) + 7 = 2x + 10.

a) 6
b) 7
c) 8
d) None of these

Answer:

a) 6

Question 62. The radius of a cylinder is 7 cm, and its height is 10 cm. Find its volume (π = 22/7).

a) 1540 cm³
b) 1440 cm³
c) 1650 cm³
d) None of these

Answer:

a) 1540 cm³

Question 63. A rectangle’s length is twice its breadth. If its perimeter is 60 cm, find its length.

a) 10 cm
b) 20 cm
c) 15 cm
d) None of these

Answer:

b) 20 cm

Question 64. The sides of a triangle are 3 cm, 4 cm, and 5 cm. What is its area?

a) 6 cm²
b) 7 cm²
c) 5 cm²
d) None of these

Answer:

a) 6 cm²

Question 65. A cone has a slant height of 13 cm and a base radius of 5 cm. Find its curved surface area (π = 22/7).

a) 204 cm²
b) 215 cm²
c) 230 cm²
d) None of these

Answer:

a) 204 cm²

Question 66. A man spends 60% of his income and saves Rs 4000. What is his total income?

a) Rs 10,000
b) Rs 8,000
c) Rs 12,000
d) None of these

Answer:

a) Rs 10,000

Question 67. Solve for x: 4x² = 64.

a) ±4
b) ±8
c) 4
d) None of these

Answer:

a) ±4

Question 68. A sum of Rs 5000 is invested at 10% per annum compound interest for 2 years. Find the total amount.

a) Rs 6050
b) Rs 5500
c) Rs 6055
d) None of these

Answer:

a) Rs 6050

Question 69. Two pipes can fill a tank in 10 hours and 15 hours, respectively. How long will they take to fill it together?

a) 6 hours
b) 7 hours
c) 6 hours 30 minutes
d) None of these

Answer:

c) 6 hours 30 minutes

Question 70. The diameter of a sphere is 14 cm. Find its volume (π = 22/7).

a) 1436 cm³
b) 1437 cm³
c) 1436.8 cm³
d) None of these

Answer:

a) 1436 cm³