Decimal Numbers Quiz Set 004

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Question 1

What is x in ${722/0.0722} = {7.22/x}$?

 A

$7.22 × 10^{-4}$.

 B

$7.22 × 10^{-3}$.

 C

$7.22 × 10^{-2}$.

 D

$7.22 × 10^{-5}$.

Soln.
Ans: a
Transposing, x = $7.22 × {0.0722/722}$ which gives 0.000722, which, in scientific form is $7.22 × 10^{-4}$.

Question 2

What is ${(-27) × 9.6 - 73 × (-3.6)}/9.6$?

 A

${3/8}$.

 B

${1/8}$.

 C

${5/8}$.

 D

${7/8}$.

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: ${(-27) × 96 - 73 × (-36)}/96$. We can now simpilfy the minus signs to get ${(73 × 36) - (27 × 96)}/96$ which equals ${3/8}$


Question 3

Which is the smallest?

 A

$0.3^3$.

 B

$1/0.3$.

 C

$0.3$.

 D

$0.3^2$.

Soln.
Ans: a

We know that if a number is less than 1, then it becomes smaller and smaller as it is raised to higher and higher positive powers. Now, $1/0.3$ is same as $0.3^{-1}$. The three powers of 0.3 given to us are -1, 1, 2 and 3. Out of these 3 is the most positive, so, $0.3^3$ is the smallest.


Question 4

What is $93{97/100000}$?

 A

93.00097.

 B

91.00097.

 C

93.97000.

 D

93.0097.

Soln.
Ans: a

The given expression can be written as ${93 × 100000 + 97}/100000$ which is same as $9300097/100000$ which gives 93.00097


Question 5

What is z in $6.599 + 0.3 - z = 0.04$?

 A

6.859.

 B

0.4.

 C

4.0.

 D

8.659.

Soln.
Ans: a

z = (0.3 + 6.599) - 0.04 = 6.859.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 004" 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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