Decimal Numbers Quiz Set 019

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Question 1

What is x in $0.003/x = 0.01$?

 A

0.3.

 B

0.03.

 C

0.003.

 D

3.0.

Soln.
Ans: a

The expression becomes $x = {3/1000} × {100}$ = 0.3.


Question 2

What is ${8.00^3 - 0.90^3}/{8.00^2 + 7.200 + 0.90^2}$?

 A

7.10.

 B

6.95.

 C

7.56.

 D

6.56.

Soln.
Ans: a

We know ${a^3 - b^3}/{a^2 + ab + b^2}$ is same as ${(a - b) × (a^2 + ab + b^2)}/{a^2 + ab + b^2}$ which is same as a - b. So we get a - b = 8.00 - 0.90 = 7.10.


Question 3

What is 0.0029 × 0.94?

 A

$2.726 × 10^{-3}$.

 B

$2.726 × 10^{-4}$.

 C

$2.726 × 10^{-2}$.

 D

$2.726 × 10^{-5}$.

Soln.
Ans: a

Question 4

For what value of x would this expression be a perfect square: $2.3 × 2.3 - x × 2.3 + 0.9 × 0.9$?

 A

1.8.

 B

2.3.

 C

0.9.

 D

0.23.

Soln.
Ans: a

Comparing the given expression with $a^2 - 2 × a ×b + b^2 = (a - b)^2$, we see that if a = 2.3, and b = 0.9 then by inspection, x should be equal to 2b = 2 × 0.9 = 1.8.


Question 5

What is x in ${846/0.0846} = {8.46/x}$?

 A

$8.46 × 10^{-4}$.

 B

$8.46 × 10^{-3}$.

 C

$8.46 × 10^{-2}$.

 D

$8.46 × 10^{-5}$.

Soln.
Ans: a
Transposing, x = $8.46 × {0.0846/846}$ which gives 0.000846, which, in scientific form is $8.46 × 10^{-4}$.

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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 019" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-06-24.

Posted by Parveen(Hoven),
Aptitude Trainer


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