Can anyone please send Class 8 maths chapter 4 squares and square roots mcq questions answers
Answers
Answer:
PLS MARK AS BRAINLIEST
Step-by-step explanation:
1. Which of the following is a perfect square?
A. 1057
B. 625
C. 7928
D. 64000
Answer: B
Explanation: The natural numbers which end with 0, 2, 3, 7 and 8 are not perfect squares. Hence, 625 is a perfect square.
25 x 25 = 625
2. Which of the following will have 6 at unit place?
A. 192
B. 112
C. 242
D. 132
Answer: C
Explanation: 242 = 24 x 24 = 576
3. If 5278 is squared, then what will be at unit place?
A. 8
B. 7
C. 6
D. 4
Answer: D
Explanation: If we square the unit digit of the number 5278 we get:
82 = 64
Hence, at the unit place of 52782 the number is 4.
4. What will be the number of zeros in square of 400?
A. 2
B. 3
C. 4
D. 6
Answer: C
Explanation: 4002 = 400 x 400 = 160000
5. How many natural numbers lie between 92 and 102?
A. 17
B. 18
C. 19
D. 20
Answer: B
Explanation: The number of natural numbers between n2 and (n+1)2 is equal to 2n.
Here, n = 9
Therefore, 2n = 2 x 9 = 18
6. What is the sum of the first four odd natural numbers?
A. 16
B. 17
C. 18
D. 20
Answer: A
Explanation: The sum of the first odd natural numbers = 1+3+5+7 = 16
7. The value of 92 – 1 is equal to:
A. 81
B. 80
C. 79
D. None of the above
Answer: B
Explanation: 92-1 = 81 – 1 = 80
8. The sum of 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 +19 is:
A. 121
B. 120
C. 100
D. 110
Answer: C
Explanation: Sum of n odd numbers = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 +19 =100
9. The square of 42 is:
A. 1764
B. 1664
C. 1564
D. 1504
Answer: A
Explanation: 422 = (40 + 2)2
= (40+2) (40+2)
= 40(40 + 2) + 2(40 + 2)
= 402 + 40 x 2 + 2 x 40 + 22
= 1600 + 80 + 80 + 4
= 1764
10. The Pythagorean triples whose smallest number is 8:
A. 8, 16 17
B. 8, 17, 18
C. 8, 15, 17
D. 8, 15, 16
Answer: C
Explanation: The general form of Pythagorean triplets is 2m, m2-1, m2+1
Given, 2m = 8
So, m = 4
m2 – 1= 42-1 = 16-1 = 15
m2+1=42+1= 16+1 = 17