Decimal Numbers Quiz Set 002

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Question 1

What is 0.0061 × 0.84?

 A

$5.124 × 10^{-3}$.

 B

$5.124 × 10^{-2}$.

 C

$5.124 × 10^{-1}$.

 D

$5.124 × 10^{-4}$.

Soln.
Ans: a

Question 2

14687 is same as?

 A

$1.4687 × 10^{4}$.

 B

$1.4687 × 10^{3}$.

 C

$1.4687 × 10^{5}$.

 D

$1.4687 × 10^{2}$.

Soln.
Ans: a

Question 3

What is ${42 × 1.9 - 68 × 5.2}/9.1$?

 A

$-30{8/91}$.

 B

$-30{7/91}$.

 C

$-30{6/91}$.

 D

$-30{9/91}$.

Soln.
Ans: a

Observe that all fractional numbers are having one digit to the right of the dot. So we can cancel all the dots and get a plain expression: ${42 × 19 - 68 × 52}/91$ which equals ${-2738/91}$, which is same as: $-30{8/91}$


Question 4

What is z in $2.285 + 0.4 - z = 0.02$?

 A

+2.665.

 B

-2.665.

 C

+2.556.

 D

-2.556.

Soln.
Ans: a

z = (0.4 + 2.285) - 0.02 = 2.665.


Question 5

What is x in ${149/0.0149} = {1.49/x}$?

 A

$1.49 × 10^{-4}$.

 B

$1.49 × 10^{-5}$.

 C

$1.49 × 10^{-3}$.

 D

$1.49 × 10^{-2}$.

Soln.
Ans: a
Transposing, x = $1.49 × {0.0149/149}$ which gives 0.000149, which, in scientific form is $1.49 × 10^{-4}$.

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This Blog Post/Article "Decimal Numbers Quiz Set 002" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-04-07.

Posted by Parveen(Hoven),
Aptitude Trainer


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