Ncert -Class 8 -Maths – Worksheet-Questions -SET C

1. Find \(\sqrt{49}\)
   (A) 7 (B) –7
   (C) 8 (D) Not defined

3. Find the square root of 1225.
   (A) 25 (B) 20
   (C) 35 (D) 45
4. Find the square root of 729.
   (A) 23 (B) 17
   (C) 18 (D) 27
5. Find the square root of 2025.
   (A) 45 (B) 55
   (C) 35 (D) –65

Multi Correct Type Questions

6. Find the smallest square number divisible by 2, 5
   and 8?
   (A) 40 (B) 200
   (C) 400 (D) 300
7. Find the square root of 20.25
   (A) 5.5 (B) 4.5
   (C)
   90
   20 (D)
   6
   2
8. If 2 n 49  then n is
   (A) –7 (B) 6
   (C) 7 (D) 8
9. Is 64000 perfect square?
   (A) Yes
   (B) No
   (C) When multiply by ‘10’
   (D) When divided by ‘10’
10. What will be the unit digit in the square of 83?
    (A) 1 (B) 2
    (C) 3 (D) 9

Case Based Questions:

If a²= b, b²= c, c²= d and d = 256.

11. Find the possible values of c.
    (A) 16 (B) –16
    (C) 15 (D) –15
12. Find the possible values of b.
    (A) 4 (B) –4
    (C) –2 (D) 2
13. Find the possible values of a.
    (A) 2 (B) –2
    (C) 4 (D) –4

Assertion & Reason Type Questions
(A) Both Assertion (A) and Reason (R) are true
and Reason (R) is the correct explanation of
Assertion (A).
(B) Both Assertion (A) and Reason (R) are true
but reason (R) is not the correct explanation
of Assertion (A).
(C) Assertion (A) is true but Reason (R) is false.
(D) Assertion (A) is false but Reason (R) is true.

14. Assertion: \(\sqrt{16} = -4 \)
    Reason: Square root of a positive number is always negative.
15. Assertion: If n² = 25, then \(n = \pm5 \)
    Reason: \(\sqrt{25} =\pm 5\)

DESCRIPTIVE

1. Find the square root of 144 by successive subtraction?

2. Find the square root of 23.04 by division method.

3. In a right triangle ABC, angle B = 90 degree .
(a) If AB = 6 cm, BC = 8 cm, find AC
(b) If AC = 13 cm, BC = 5 cm, find AB.