Decimal Numbers Quiz Set 010

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Question 1

What is 0.0088 × 0.38?

 A

$3.344 × 10^{-3}$.

 B

$3.344 × 10^{-2}$.

 C

$3.344 × 10^{-1}$.

 D

$3.344 × 10^{-4}$.

Soln.
Ans: a

Question 2

What is ${0.70 × 0.70 × 0.70 + 0.03 × 0.03 × 0.03}/{3.50 × 3.50 × 3.50 + 0.15 × 0.15 × 0.15}$?

 A

$1/5^3$.

 B

$1/7^3$.

 C

$1/5^2$.

 D

$1/7^2$.

Soln.
Ans: a

By inspection, the given ratio is same as ${0.70 × 0.70 × 0.70 + 0.03 × 0.03 × 0.03}/{5^3 × ({0.70 × 0.70 × 0.70 + 0.03 × 0.03 × 0.03})}$ which is $1/5^3$.


Question 3

What is y in $9.69 + 0.1 + y = 0.09$?

 A

-9.7.

 B

+9.7.

 C

-7.9.

 D

+7.9.

Soln.
Ans: a

y = 0.09 - (0.1 + 9.69) = -9.7.


Question 4

What is x in ${437/0.0437} = {4.37/x}$?

 A

$4.37 × 10^{-4}$.

 B

$4.37 × 10^{-3}$.

 C

$4.37 × 10^{-2}$.

 D

$4.37 × 10^{-5}$.

Soln.
Ans: a
Transposing, x = $4.37 × {0.0437/437}$ which gives 0.000437, which, in scientific form is $4.37 × 10^{-4}$.

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 010" 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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