Maths Quiz Questions with Answers Part - 5
Mathematics Class 8
Questions and Answers
Maths Quiz Questions with Answers. Let us answer here some of the quizzes which are based on the basic concepts and formulas of classes 7th , 8th , 9th and 10th concepts.
Important Links for Preparation
1. What is the sum of the first 10 natural numbers ?
Answer: 55
(Formula: n(n + 1)/2 = 10 × 11 / 2 = 55)
2. What is
the difference between the squares of 21 and 22 ?
Answer: 43 Use trick (21 + 22) = 43 or use trick ( 2 x 21 +1 = 43)
3. How many zeros are there in the square of 900 ?
Answer: 4 (900² = 81000000).
4. The volume of a cubical box is 64 cm³. What is its side ?
Answer: 4 cm (since 4³ = 64).
5. . If a clock shows 3:15, what is the angle between the hour and the minute hands ?
Answer: 7.5°
1 minute = (1/2)o and 15 minute = 1/2 X 15 = 7.5o
6. What number should be added to 1234 to make it a perfect square ?
Answer: 2
7. If the digit in one’s place of a number is 2, then the last digit of its cube will be:
Answer: 8.
8. If the sum of two numbers is 71 and one number is x, then the other number is:
Answer: 71 - x.
9. Two years ago my age was x years, then what was my age 5 years ago ?
Answer: x - 3 years.
10. How old will I be after 10 years, if my age before 10 years was x years ?
Answer: x + 20 years.
11. Which quadrilateral has two pairs of adjacent sides equal and diagonals intersecting at right angles ?
Answer: Kite.
12. Which quadrilaterals has a pair of opposite sides parallel ?
Answer: Trapezium.
13. Which of the following quadrilaterals (Paralllogram, rectangle square, rhombus) is a regular quadrilateral ?
Answer: Square.
14. Which quadrilateral has all angles as right angles, opposite sides equal and diagonals bisect each other ?
Answer: Rectangle.
15. If diagonals of a parallelogram are equal and bisect each other at right angle, then it is called ?
Answer: Rhombus.
16. How many weeks are there in one year.
Answer: 52 weeks
17. Find the least number that must be subtracted from 640 so as to get a perfect square.
Answer: 15.
18. What is scalene triangle ?
Answer: All sides are different.
19. An isosceles triangle is a triangle with:
Answer: Two sides equal.
20. An equilateral triangle is a triangle with:
Answer: All sides equal.
21. What is an obtuse angle ?
Answer: An angle more than 90°.
22. What is the sum of all angles of a triangle ?
Answer: 180°.
23. In a right-angled triangle, the longest side is called:
Answer: Hypotenuse.
24. A right-angled triangle must have:
Answer: One right angle.
25. What is 25% of 80 ?
26. Question What number should be added to 15 to make it a perfect square?
Answer: 1 (because 15 + 1 = 16 = 4²)
27. What is the smallest 3-digit number divisible by 9?
Answer: 108
(First 3-digit number is 100; 100 ÷ 9 = remainder 1 → 108
is first divisible)
28. The median of 4, 6, 8, 10, 12 is:
Answer: 8.
29. In a die throw, probability of getting an even number is:
Answer: 1/2.
30. Square of 25 is:
Answer: 625.
31. How many items are there in one score
Answer: 20 items
32. Square root of 144 is:
Answer: 12.
33. Write the value of √81 + √49.
Answer: 9 + 7 = 16
34. Cube root of 512 is:
Answer: 8.
35. The point (0, –5) lies on:
Answer: y-axis.
36. 20% of 250 is:
Answer: 50.
37. A sum of ₹5000 is borrowed at 10% simple interest for 2 years. Then what is the Interest after 2 years.
Answer: ₹1000.
38. The price of a fan is ₹1200 after 20% discount. Original price =
Answer: ₹1500.
39. Expand (a + b)² =
Answer: a² + 2ab + b².
40. Simplify (x + 3)(x – 3):
Answer: x² – 9.
41. How many faces a cube have?
Answer: 6.
42. How many edges does a cuboid have?
Answer: 12.
43. Area of a square of side 10 cm =
Answer: 100 cm².
44. Volume of cube with side 5 cm =
Answer: 125 cm³.
45. Simplify (2³)² =
Answer: 2⁶ = 64.
46. Write 0.00027 in standard form:
Answer: 2.7 × 10⁻⁴.
47. If 5 workers can build a wall in 10 days, 10 workers will build it in:
Answer: 5 days (inverse proportion).
48. If 4 pens cost ₹40, cost of 7 pens =
Answer: ₹70.
49. Factorise x² – 9:
Answer: (x + 3)(x – 3).
50. Factorise 2x² + 5x + 3:
Answer: (2x + 3)(x + 1).
51. The point (3, 0) lies on:
Answer: x-axis.
52. If 3 pens cost ₹18, what is the cost of 7 pens?
Answer: ₹42
53. A rectangle has a length twice its breadth. If its perimeter is 60 cm, find its area.
Answer: 200 cm²
54. The average of 10, 20, 30, 40, and 50 is _____.
Answer: 30
55. What is the square of 1.5?
Answer: 2.25
56. If 5x = 45, then find the value of x + 10.Answer: 19
57. What is the value of 12² – 8² using the identity (a² – b²) = (a + b)(a – b)?Answer: 80
58. If the perimeter of an equilateral triangle is 30 cm, what is the length of each side?Answer: 10 cm
59. What is the value of π (pi) up to two decimal places?Answer: 3.14
60. How many diagonals does a hexagon have?Answer: 9
No. of sides = 6
Number of diagonals - n(n - 1)/2 - n
(6 x 5)/2 – 6 = 9
61. The sum of the angles of a quadrilateral is ______ degrees.Answer: 360°
62. A man walks 3 km east, then 4 km north. What is the shortest distance back to the starting point?Answer: 5 km
(By Pythagoras theorem: √(3² + 4²) = 5)
63. What is the value of 0 divided by any non-zero number ?Answer: 0
64. What is the Roman numeral for 99 ?Answer: XCIX
65. Which is greater: 3/4 or 4/5 ?Answer: 4/5
66. What is the LCM of 12 and 18 ?Answer: 36
67. How many zeros are there in one million ?Answer: 6
68. What is the next prime number after 47 ?Answer: 53
69. If the radius of a circle is doubled, how many times does its area increase ?Answer: 4 times
70. The cube root of 125 is ______.Answer: 5
THANKS FOR YOUR VISIT
PLEASE COMMENT BELOW
Comments
Post a Comment