100+ Square Root and Cube Root Aptitude Questions Answers - 1

Question: 1

$${√196}/{7}$$ × $${√441}/{7}$$ × $${120}/{√225}$$ = ?

(A) 36

(B) 48

(C) 54

(D) 62

Ans: B

Given expression = $${14}/{7} × {21}/{7} × {120}/{15}$$ = 2 × 3 × 8 = 48.

Question: 2

What percentage of the numbers from 1 to 50 have squares that end in the digit 1?

(A) 5

(B) 10

(C) 20

(D) 25

Ans: C

The square of numbers having 1 and 9 as the unit’s digit end in the digit 1.

Such numbers are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49 i.e., there are 10 such numbers.

∴ Required percentage = $$({10}/{50} × 100)$$% = 20%.

Question: 3

What is the square root of 0.16?

(A) 0.4

(B) 0.04

(C) 0.004

(D) 4

Ans: A

$$√0.16$$ = $$√{16/100}$$ = $$√{16}/√{100}$$ = $${4}/{10}$$ = 0.4.

Question: 4

$$√50$$ × $$√98$$ is equal to

(A) 60

(B) 63.75

(C) 65.95

(D) 70

Ans: D

$$√50$$ × $$√98$$ = $$√50×98$$ = $$√4900$$ = 70.

Question: 5

A group of students decided to collect as many paise from each member of the group as is the number of members. If the total collection amounts to Rs. 59.29, the number of members in the group is

(A) 47

(B) 57

(C) 67

(D) 77

Ans: D

Money collected = (59.29 × 100) paise = 5929 paise.

∴ Number of members = $$√5929$$ = 77.

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