Decimal Numbers Quiz Set 009 | Maths Aptitude Mock Test on Decimals and Floating Point Numbers Set 9 | mock tests for Bank PO, SSB/SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

0.00218828 is same as?

$2.18828 × 10^{-3}$.

$2.18828 × 10^{-2}$.

$2.18828 × 10^{-1}$.

$2.18828 × 10^{-4}$.

Soln.
Ans: a

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Question 2

What is ${(-32) × 2.9 - 47 × (-3.8)}/6.9$?

$12{10/23}$.

$12{9/23}$.

$12{7/23}$.

$12{11/23}$.

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: ${(-32) × 29 - 47 × (-38)}/69$. We can now simpilfy the minus signs to get ${(47 × 38) - (32 × 29)}/69$ which equals ${286/23}$, which is same as: $12{10/23}$

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Question 3

For what value of x would this expression be a perfect square: $1.76 × 1.76 + x × 1.76 + 0.5 × 0.5$?

0.1.

0.01.

0.001.

Soln.
Ans: a

Comparing the given expression with $a^2 + 2 × a ×b + b^2 = (a + b)^2$, we see that if a = 1.76, and b = 0.5 then by inspection, x should be equal to 2b = 2 × 0.5 = 1.

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Question 4

What is $0.15966/0.02$?

7.983.

6.983.

5.983.

8.983.

Soln.
Ans: a

The given expression can be written as ${15966/2} × {100/100000}$ which is same as ${15966/2} × {1/1000}$, which is same as $7983 × {1/1000}$, which is same as 7.983

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Question 5

Which is the smallest?

$0.32^3$.

$1/0.32$.

$0.32$.

$0.32^2$.

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, $1/0.32$ is same as $0.32^{-1}$. The three powers of 0.32 given to us are -1, 1, 2 and 3. Out of these 3 is the most positive, so, $0.32^3$ is the smallest.

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