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Question (21)

QN0018340

Which idea best explains why 'root' is used in mathematics?

(A) Roots absorb water
(B) Roots are underground
(C) Roots represent the basis or origin of a quantity
(D) Roots grow branches

Correct Answer: C

Explanation:

Root denotes the basis or origin from which a quantity is formed.

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Question (22)

QN0018341

What is the square root of 81?

(A) 7
(B) 8
(C) 9
(D) 10

Correct Answer: C

Explanation:

9 × 9 = 81.

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Question (23)

QN0018342

Which expression represents a square number?

(A) 6 × 6
(B) 6 + 6
(C) 6 − 6
(D) 6 ÷ 6

Correct Answer: A

Explanation:

A square number is obtained by multiplying a number by itself.

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Question (24)

QN0018343

The cube root of 125 is:

(A) 4
(B) 5
(C) 6
(D) 7

Correct Answer: B

Explanation:

5³ = 125.

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Question (25)

QN0018344

Which number is a perfect square?

(A) 36
(B) 45
(C) 54
(D) 63

Correct Answer: A

Explanation:

36 = 6².

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Question (26)

QN0018345

Which number is a perfect cube?

(A) 72
(B) 81
(C) 125
(D) 144

Correct Answer: C

Explanation:

125 = 5³.

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Question (27)

QN0018346

If √x = 12, then x =

(A) 24
(B) 72
(C) 124
(D) 144

Correct Answer: D

Explanation:

x = 12² = 144.

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Question (28)

QN0018347

If ∛x = 4, then x =

(A) 16
(B) 32
(C) 64
(D) 128

Correct Answer: C

Explanation:

x = 4³ = 64.

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Question (29)

QN0018348

Which of the following is the value of varga-mula of 169?

(A) 11
(B) 12
(C) 13
(D) 14

Correct Answer: C

Explanation:

√169 = 13.

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Question (30)

QN0018349

Which of the following is the value of ghana-mula of 216?

(A) 4
(B) 5
(C) 6
(D) 7

Correct Answer: C

Explanation:

∛216 = 6.

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