Decimal Numbers Quiz Set 018

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Question 1

Which is the smallest?

 A

$0.001^3$.

 B

$1/0.001$.

 C

$0.001$.

 D

$0.001^2$.

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, $1/0.001$ is same as $0.001^{-1}$. The three powers of 0.001 given to us are -1, 1, 2 and 3. Out of these 3 is the most positive, so, $0.001^3$ is the smallest.


Question 2

What is y in $9.073 + 0.8 + y = 0.02$?

 A

-9.853.

 B

-8.853.

 C

-7.853.

 D

-10.853.

Soln.
Ans: a

y = 0.02 - (0.8 + 9.073) = -9.853.


Question 3

Which is the smallest?

 A

$0.077^3$.

 B

$1/0.077$.

 C

$0.077$.

 D

$0.077^2$.

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, $1/0.077$ is same as $0.077^{-1}$. The three powers of 0.077 given to us are -1, 1, 2 and 3. Out of these 3 is the most positive, so, $0.077^3$ is the smallest.


Question 4

For what value of x would this expression be a perfect square: $8.88 × 8.88 - x × 8.88 + 0.5 × 0.5$?

 A

1.

 B

0.1.

 C

0.001.

 D

0.01.

Soln.
Ans: a

Comparing the given expression with $a^2 - 2 × a ×b + b^2 = (a - b)^2$, we see that if a = 8.88, and b = 0.5 then by inspection, x should be equal to 2b = 2 × 0.5 = 1.


Question 5

What is $14{21/100000}$?

 A

14.00021.

 B

14.0021.

 C

14.021.

 D

1.4021.

Soln.
Ans: a

The given expression can be written as ${14 × 100000 + 21}/100000$ which is same as $1400021/100000$ which gives 14.00021


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 018" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-05-17.

Posted by Parveen(Hoven),
Aptitude Trainer


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