Square and Cube Roots Quiz Set 012

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Question 1

How many 4 digit numbers are their whose squares end in 2?

 A

0.

 B

4.

 C

10.

 D

21.

Soln.
Ans: a

It is not possible for the square of any number to end in 2, 3, 7 or 8. Hence the answer is 0.


Question 2

One-fifth of the square-root of which number is 0.6?

 A

9.

 B

16.

 C

4.

 D

25.

Soln.
Ans: a

Let the number be n. So ${1/5} × √n$ = 0.6, which gives $√n$ = 5 × 0.6 = 3. so n = $3^2$ = 9.


Question 3

What is √(38880) × √(9720)?

 A

19440.

 B

19840.

 C

19441.

 D

19640.

Soln.
Ans: a

We can see that √(38880) × √(9720) is same as √(2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 × 3 × 3 × 5 ) × √(2 × 2 × 2 × 3 × 3 × 3 × 3 × 3 × 5 ) which equals √(28 × 310 × 52), which equals (24 × 35 × 51), which gives 19440.


Question 4

What is the value of $x$ in $√{0.0196 × x}$ = 1.4?

 A

100.

 B

1.

 C

10.

 D

1000.

Soln.
Ans: a

The given expression can be simplified to $0.0196 × x$ = $1.4^2$, which gives x = ${1.4^2}/0.0196$, which is same as $1.96/0.0196$ which gives 100.


Question 5

What is the value of ${√16/5}$ × ${3/√4}$ × ${5/√9}$?

 A

2.

 B

4.

 C

1.

 D

5.

Soln.
Ans: a

The given expression can be simplified to ${√2^4/5}$ × ${3/√2^2}$ × ${5/√3^2}$, which is same as ${2^2/5}$ × ${3/2}$ × ${5/3}$, which cancels to 2.


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Creative Commons License
This Blog Post/Article "Square and Cube Roots Quiz Set 012" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2019-08-18.

Posted by Parveen(Hoven),
Aptitude Trainer


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