Square and Cube Roots Quiz Set 015

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Question 1

How many 2 digit numbers are their whose squares end in 8?

 A

0.

 B

11.

 C

10.

 D

5.

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.

Solution | Discuss! | Chapters»

Question 2

One-fourth of the cube-root of which number is 0.4?

 A

4.096.

 B

4.024.

 C

4.256.

 D

4.128.

Soln.
Ans: a

Let the number be n. So ${1/4} × √^3n$ = 0.4, which gives $√^3n$ = 4 × 0.4 = 1.6. so n = $1.6^3$ = 4.096.

Solution | Discuss! | Chapters»

Question 3

If x = 0.3193, then what is the value of $11x + √{16x^2 - 8x + 1}$?

 A

3.24.

 B

0.324.

 C

32.4.

 D

3.16.

Soln.
Ans: a

By inspection, $11x + √{16x^2 - 8x + 1}$ is same as $11x + √{({1 - 4x})^2}$, which is same as 11x + (1 - 4x) = 1 + 7x = 3.24.

Solution | Discuss! | Chapters»

Question 4

How many 2 digit numbers are their whose squares end in 8?

 A

0.

 B

16.

 C

9.

 D

1.

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.

Solution | Discuss! | Chapters»

Question 5

What is √0.0009?

 A

0.03.

 B

0.9.

 C

0.3.

 D

0.81.

Soln.
Ans: a

We can see that 0.03 × 0.03 = 0.0009, so square root is 0.03.

Solution | Discuss! | Chapters»
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Updated on 2020-02-07. Published on: 2016-04-20

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