Test: Square Root And Cube Root- 1

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This mock test of Test: Square Root And Cube Root- 1 for Banking Exams helps you for every Banking Exams entrance exam. This contains 10 Multiple Choice Questions for Banking Exams Test: Square Root And Cube Root- 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Square Root And Cube Root- 1 quiz give you a good mix of easy questions and tough questions. Banking Exams students definitely take this Test: Square Root And Cube Root- 1 exercise for a better result in the exam. You can find other Test: Square Root And Cube Root- 1 extra questions, long questions & short questions for Banking Exams on EduRev as well by searching above.

QUESTION: 1

A.
24
B.
12
C.
48
D.
36

Solution:

⇒ x²= √331776

⇒ x² = 576

⇒ x = √576

⇒ x = 24

QUESTION: 2

A.
2.24
B.
1.24
C.
1.34
D.
2.34

Solution:

(5.4756)^1/2 = 2.34

QUESTION: 3

If 3√5 + √125 = 17.88, then what will be the value of √80 + 6√5?

A.
21.66
B.
13.41
C.
44.7
D.
22.35

Solution:

QUESTION: 4

The cube root of 0.000729 is

A.
0.09
B.
0.9
C.
0.21
D.
0.11

Solution:

QUESTION: 5

What is the least perfect square which is divisible by each of 21, 36 and 66?

A.
213444
B.
214434
C.
214344
D.
231444

Solution:

► L.C.M. of 21, 36, 66 = 2772
► Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11
To make it a perfect square, it must be multiplied by 7 x 11.
So, required number = 2 x 2 x 3 x 3 x 7 x 7 x 11 x 11 = 213444

QUESTION: 6

A.
0.85
B.
0.72
C.
2.8
D.
0.4

Solution:

= (12/11) x (11/15) x (15/14)

= 12/14

= 0.85

QUESTION: 7

A.
36/√7
B.
7/36
C.
36/7
D.
7/√36

Solution:

► Using identity, (a-b)² = a² + b² - 2ab

► Here a = √7 and b = 1/√7

= (√7)²+ (1/√7)² - 2. √7.1/√7

= 7 + 1/7 - 2

= 5 + 1/7

= 36/7

QUESTION: 8

The square root of 16641 is:

A.
129
B.
121
C.
211
D.
229

Solution:

Step 1:

We now need to obtain the digital root of the number. Here's how you do it:
Split the number up and add each digit together:
1 + 6 + 6 + 4 + 1 = 18
If the answer is more than one digit, you would add each digit of the answer together again:
1 + 8 = 9
What is the digital root of number 16,641?
Answer: 9

Step 2:

So now we know the digital root of 16,641 is 9. Is 9 in the list of digital roots that are always a square root (1, 4, 7 or 9)?
Answer: YES, 9 is in the list of digital roots that are always perfect squares. We can conclude that 16,641 could be a perfect square!

Factoring

OK, so now we know that 16,641 could be a perfect square. We have to find the factors of the number to be sure.
Here are all of the factors of 16,641:
(1 x 16,641) (3 x 5,547) (9 x 1,849) (43 x 387) (129 x 129)

Hence the answer is 129.

QUESTION: 9